TW201724717A - High voltage gain power converter - Google Patents

Abstract

The present invention relates to a high voltage gain power converter, comprising an input unit, a DC to DC converter circuit featured by high voltage gain, and an output unit. A high voltage direct current can be obtained after a low voltage direct current input from the input unit and converted by the DC to DC converter circuit. Meanwhile, the voltage gain is (1+D)2/(1-D), wherein D is duty cycle and ranges between zero and one. With such arrangement, the present invention has higher voltage gain than counterpart boost converters which have to be operated under high duty cycle and subject to higher energy loss.

Description

High voltage gain power conversion device

The present invention relates to a high voltage gain power conversion device, and more particularly to an input voltage inputting a low voltage DC power to a high voltage gain DC-DC conversion circuit for conversion to obtain a high voltage DC power. And a voltage gain is (1 + D) ² / (1-D), D is the duty cycle, the high voltage gain power conversion device.

Boost Converter is widely used in various electrical appliances. At present, in order to respond to environmental protection, green energy sources such as solar energy, wind energy, geothermal energy, hydropower, tidal energy, ocean energy and biomass energy are used, and the voltage generated by green energy is low voltage, therefore, In use, the power generated by the green energy needs to be boosted by the DC-DC converter before it can be converted into a sinusoidal voltage and integrated into the mains.

Referring to FIG. 14, a conventional step-up power conversion device (A) includes an input terminal (A1), an inductor (A2), a switch (A3), and an output diode ( A4), an output capacitor (A5) and a load (A6). Wherein one end of the input terminal (A1) is electrically connected to one end of the inductor (A2). The other end of the input terminal (A1) is electrically connected to one end of the switch (A3). The other end of the switch (A3) is electrically connected to the other end of the inductor (A2) and the anode end of the output diode (A4). The cathode end of the output diode (A4) is electrically connected to one end of the output capacitor (A5) and one end of the load (A6). The other end of the output capacitor (A5) and the other end of the load (A6) are electrically connected to the other end of the input terminal (A1). The voltage gain ratio is: 1/(1-D), D is the duty cycle, and D is between 0 and 1.

However, in order to maximize the voltage gain, the conventional step-up power conversion device needs to operate at a higher duty cycle, but under high duty cycle operation, it is parasitic by the series equivalent resistance of the power component and the inductor (parasitic The effect of the component causes an increase in energy loss, which in turn limits the voltage gain. Therefore, there is further provided a switching inductive step-up type power conversion device (B) for improving the conventional step-up power conversion device (A). As shown in FIG. 15, the switching inductive step-up type power conversion device (B) The invention comprises an input terminal (B1), a first diode (B2), a second diode (B3), a third diode (B4), a switch (B5), and a first inductor. (B6), a second inductor (B7), an output diode (B8), an output capacitor (B9), and a load (B0). One end of the input terminal (B1) is electrically connected to one end of the first inductor (B6) and the anode end of the third diode (B4). The other end of the first inductor (B6) is electrically connected to the anode end of the second diode (B3) and the anode end of the first diode (B2). The cathode end of the second diode (B3) is electrically connected to the cathode end of the third diode (B4) and one end of the second inductor (B7). The other end of the second inductor (B7) is electrically connected to the cathode end of the first diode (B2), one end of the switch (B5), and the anode end of the output diode (B8). The cathode end of the output diode (B8) is electrically connected to one end of the output capacitor (B9) and one end of the load (B0). The other end of the output capacitor (B9), the other end of the load (B0) and the other end of the switch (B5) are electrically connected to the other end of the input terminal (B1). Its voltage-gain ratio is: (1+D)/(1-D), D is the duty cycle, and D is between 0 and 1, however, its voltage gain ratio still has room for improvement.

Furthermore, there is a patented high-boost ratio power conversion device, such as the Republic of China Invention Patent Publication No. I429176 "High Boost Ratio DC Converter", in which the first and second switches are controlled by a control chip, and The first and second switches are both turned on, the first switch is turned on, the second switch is turned off, the first switch and the second switch are turned on, the first switch is turned off, and the second switch is turned on, so that a first and second inductors and a first The first and second clamp capacitors release energy to a first and second output capacitors, so that the first and second output capacitors are capable of releasing energy to a load after being stored. Thus, the power supply voltage output from the DC power supply to the load is boosted by the release of the first and second output capacitors, and the boost ratio is 4/(1-D). However, the former case uses two switches, and the impact of switching losses (Switching Loss) on conversion efficiency is considered.

In summary, the conventional system has the following deficiencies:

1. The conventional step-up power converter of the fourteenth figure has a voltage-gain ratio of 1/(1-D), which needs to operate at a higher duty cycle, and is subject to energy loss of parasitic components of the circuit. Limit its voltage gain.

2. The switching inductive step-up power converter of the fifteenth figure has a voltage gain ratio of (1+D)/(1-D). However, there is still room for improvement in its voltage gain ratio.

3. The voltage gain ratio of the patented "high step-up DC converter" is 4/(1-D), but the patent uses two switches, considering the effect of switching loss on conversion efficiency.

Accordingly, in order to improve the above-mentioned deficiencies, the inventors have made efforts to study and propose a high voltage gain power conversion device of the present invention, including:

An input unit is a continuous input current; a high voltage gain DC-DC conversion circuit, one side of the high voltage gain DC-DC conversion circuit is electrically connected to the input unit, wherein the high voltage boost The DC-DC conversion circuit includes a first inductor, a second inductor, a third inductor, a first diode, a second diode, a third diode, and a fourth diode. a first capacitor, a second capacitor, and a switch; wherein the first inductor and the second inductor have the same inductance value, and the anode end of the first diode is electrically connected to one end of the input unit And one end of the second inductor, the cathode end of the first diode is electrically connected to one end of the first inductor and the cathode end of the second diode, and the anode end of the second diode is electrically connected Connecting the other end of the second inductor to the anode end of the third diode, the cathode end of the third diode is electrically connected to the other end of the first inductor, one end of the second capacitor, and the fourth The anode end of the diode and one end of the switch, the second capacitor The other end is electrically connected to one end of the third inductor, and the other end of the third inductor is electrically connected to the cathode end of the fourth diode and one end of the first capacitor, and the other end of the first capacitor is electrically connected Functionally connecting the other end of the switch to the other end of the input unit; and an output unit electrically connected to the other side of the DC-DC conversion circuit having a high voltage gain, the output unit including an output a diode, an output capacitor, and a load, wherein an anode end of the output diode is electrically connected to the other end of the second capacitor, and a cathode end of the output diode is electrically connected to one end of the output capacitor And one end of the load, the other end of the output capacitor and the other end of the load are electrically connected to the other end of the switch and the other end of the input unit. The input unit inputs the DC power to the DC-DC conversion circuit with a high voltage gain. When the switch is turned on, the input unit stores the energy to the first inductor and the second inductor by using the DC power. Capaciting and releasing energy to the third inductor and the second capacitor to store, and the output capacitor releases energy to the load, when the switch is turned off, the input unit, the first inductor, the second inductor, the second The capacitor, the first capacitor, and the third inductor release energy to the output capacitor and the load, wherein a voltage gain ratio of the output unit to the input unit is (1+D) ² /(1-D), wherein , D is the duty cycle, and D is between 0 and 1.

Further, a pulse width modulation technique is used to control the on and off of the switch.

Further, the direct current input by the input unit is one of a solar battery or a fuel battery.

Further, the switching relationship is an N-type metal oxide semiconductor field effect transistor.

Combining the above technical features, the achievable effects are:

1. A low DC power is input to a DC-DC conversion circuit of a high voltage gain by an input unit of a high voltage gain power conversion device, and a high DC power is obtained by an output unit of the high voltage gain power conversion device. Wherein, when one of the DC-DC conversion circuits with the high voltage gain is turned on, the input unit stores the energy to the first inductor and the second inductor by using the DC power, and the first capacitor releases energy to the first The third inductor and the second capacitor are stored, and the output capacitor releases energy to the load; when the switch is turned off, the input unit, the first inductor, the second inductor, the second capacitor, the first capacitor, and The third inductance releases energy to the output capacitor and the load. The ratio of the voltage of the output unit to the voltage of the input unit is (1+D) ² /(1-D), where D is the duty cycle and D is between 0 and 1, compared to the conventional boost. The type power conversion device and the switching inductive step-up power conversion device have a higher voltage gain ratio.

2. The high voltage gain power conversion device of the present invention uses only one switching switch, which can reduce the switching loss caused by the switching switch.

3. The invention provides a low voltage direct current input to the DC-DC conversion circuit with high voltage gain to obtain a high voltage direct current with a high voltage gain ratio effect, and is suitable for boosting the power of the green energy.

In summary of the above technical features, the main effects of the high voltage gain power conversion apparatus of the present invention will be apparent from the following embodiments.

Referring to the first figure, a circuit diagram of a high voltage gain power conversion device (1) according to an embodiment of the present invention, the high voltage gain power conversion device (1) includes an input unit (11), a DC with high voltage gain a DC conversion circuit (12) and an output unit (13), wherein:

The input unit (11) is used for inputting a constant current. In the embodiment, the DC power input by the input unit (11) is provided by any one of a solar cell, a fuel cell, and other green energy sources. It is a low voltage DC power.

One side of the high voltage gain DC-DC conversion circuit (12) is electrically connected to the input unit (11), and the DC-DC conversion circuit (12) with high voltage gain includes a first inductor (121). a second inductor (122), a third inductor (123), a first diode (124), a second diode (125), a third diode (126), a first a quadrupole (127), a first capacitor (128), a second capacitor (129), and a switch (120), wherein the inductance of the first inductor (121) and the second inductor (122) The value is the same, the anode end of the first diode (124) is electrically connected to one end of the input unit (11) [positive terminal] and one end of the second inductor (122), the first diode The cathode end of (124) is electrically connected to one end of the first inductor (121) and the cathode end of the second diode (125), and the anode end of the second diode (125) is electrically connected to the cathode end The other end of the second inductor (122) and the anode end of the third diode (126), the cathode end of the third diode (126) is electrically connected to the other end of the first inductor (121), One end of the second capacitor (129) and the anode of the fourth diode (127) The other end of the second capacitor (123) is electrically connected to one end of the third inductor (123), and the other end of the third inductor (123) is electrically connected to the other end of the switch (120). The cathode end of the fourth diode (127) and one end of the first capacitor (128), the other end of the first capacitor (128) is electrically connected to the other end of the switch (120) and the input unit ( 11) The other end [negative terminal]. In this embodiment, the switch (120) is an N-type metal oxide semiconductor field effect transistor.

The output unit (13) is electrically connected to the other side of the DC-DC conversion circuit (12) having a high voltage gain, and the output unit (13) includes an output diode (131) and an output capacitor ( And a load (133), wherein an anode end of the output diode (131) is electrically connected to the other end of the second capacitor (129), and a cathode end of the output diode (131) is electrically connected One end of the output capacitor (132) is connected to one end of the load (133), and the other end of the output capacitor (132) is electrically connected to the other end of the load (133) to the other of the first capacitor (128). One end [negative terminal].

Referring to the second figure, a waveform diagram of a high voltage gain power conversion device according to an embodiment of the present invention in a single switching cycle, wherein a switching width switch is used to control the switching switch (120). (120) Turn on and off as shown in the first figure, and in the course of operation, it is divided into three operation modes: mode 1, mode 2, and mode 3.

Mode 1: Referring to the second and third figures, the operation interval is [t ₀ , t ₁ ]. When t=t ₀ , the switch (120) is turned on, and its current path is pointed by the arrow in the third figure. As shown, in the interval, the input unit (11) transmits energy to the first DC via the switch (120), the first diode (124), and the third diode (126). An inductor (121) and the second inductor (122) are stored, and the first capacitor (128) releases energy to the third inductor (123) and the second capacitor (129) via conduction of the switch (120). Stored, and the output capacitor (132) releases energy to the load (133). At this time, the first inductor (121) and the second inductor (122) are stored in parallel, and the third inductor (123) is also As a storage energy, the current on the first inductor (121), the second inductor (122), and the third inductor (123) increases linearly (the linear increase is as shown in the second figure [ t ₀ , t ₁ ] interval), and, in mode 1, the second diode (125), the fourth diode (127), and the output diode (131) are subjected to voltage stress Department is divided into V _in V _c1 and V _o -V _c2, which is less than the value of the output voltage V _o. While mode 1 ends at t=t ₁ , the switch (120) is turned off.

Mode 2: Referring to the second and fourth figures, the operation interval is [t ₁ , t ₂ ]. When t=t ₁ , the switch (120) is turned off, and V _c1 > V _o - V _c2 The current path is as indicated by the arrow in the fourth figure. In this interval, the input unit (11), the first inductor (121), the second inductor (122), and the second capacitor (129) are The energy is discharged in series, and the energy is transmitted to the output capacitor (132) and the load (133) via the second diode (125) and the output diode (131), and the first capacitor (128) and The third inductor (123) also releases energy in series, and energy is transferred to the output capacitor (132) and the load (133) via the output diode (131). This mode 2 ends at t=t ₂ , where V _c1 = V _o - V _c2 .

Mode 3: Referring to the second and fifth figures, the operation interval is [t ₂ , t ₃ ], and at t=t ₂ , the switch (120) is continuously turned off, and V _c1 = V _o - V _c2 The current path is as indicated by the arrow in the fifth figure. In this interval, the input unit (11), the first inductor (121), the second inductor (122), and the second capacitor (129) are Energy is discharged in series, and energy is transmitted to the output capacitor (132) and the load (133) via the second diode (125) and the output diode (131), and at the same time, the input unit (11), The first inductor (121), the second inductor (122), and the third inductor (123) also release energy in series, and pass energy through the second diode (125) and the fourth diode ( 127) and the output diode (131) is transferred to the output capacitor (132) and the load (133), and the input unit (11), the first inductor (121), and the second inductor (122) Connected in series, through the second diode (125) and the fourth diode (127), releasing energy to the first capacitor (128) for storage, and in mode 3, the switch (120), the switch First diode (124) and the Thirty-two diode (126), the voltage stress lines are _{V c1, (V c1 - V} in) / 2 and _{(V c1 - V in) /} 2, which is less than the value of the output voltage V _o. Mode 3 ends at t=t ₃ , at which point the switch (120) is turned on and the next switching cycle begins.

Wherein, during the above operation, when the switch (120) is turned on, the voltage across the first inductor (121), the second inductor (122), and the third inductor (123) (ie, v _L1 , v _L2 and v _L3 ) are respectively ,as well as And when the switch (120) is turned off, the voltages across the first inductor (121), the second inductor (122), and the third inductor (123) (ie, v _L1 , v _{L2 ,} and v _L3 ) Separately ,as well as . Using the volt-second balance principle for the first inductor (121) and the third inductor (123), the following equation can be obtained: , , That is, the voltage gain of the high voltage gain power conversion device (1) of the embodiment of the present invention is M=(1+D) ² /(1-D), where D is the duty cycle and D is between 0 and 1. Between, has a high voltage gain ratio.

See Figure with a sixth, embodiment of the operation when the input voltage V _in is 25V, the output voltage V _o is 200V, 200W full output power, the input unit (11) input voltage V _in the system of the present invention, the FIG first capacitor analog waveform (128) of the voltage V _c1, a second capacitor (129) and the output voltage V _c2 means (13) of the output voltage V _o, the scale of values which is a waveform diagram: V _in / V _C1 /V _c2 /V _o :50V/div, time: 10ms/div, and the duty cycle D is about 0.66. As can be seen from the sixth figure, the high voltage gain power conversion device (1) of the embodiment of the present invention has a high The effect of the voltage gain, and wherein the voltage V _c1 of the first capacitor (128) is about 120 V, and the voltage V _c2 of the second capacitor (129) is about 80 V, which is consistent with the foregoing equation.

Referring to FIG. 7 , the first inductor (121) and the second are operated when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W. The analog waveforms of the voltages of the inductor (122) and the third inductor (123) (ie, v _L1 , v _{L2 ,} and v _L3 ), the scale values of the waveform diagram are: v _L1 /v _L2 /v _L3 :50V/div , time: 10μs/div, and the duty cycle D is about 0.66, where v _L1 = v _L2 = V _in = 25 V, v _L3 = V _c1 - V _c2 = 40 V when the switch (120) is turned on When the switch (120) is turned off, v _L1 = v _L2 = (V _in - V _c1 )/2 = -47.5 V, v _L3 = -Vc2 = -80 V.

Referring to the eighth embodiment, when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W, the first diode (124) is crossed. The analog waveforms of the voltages of the second diode (125) and the third diode (126) (ie, v _D1 , v _{D2 ,} and v _D3 ), the scale values of the waveform diagram are: v _D1 /v _D2 / v _D3 : 50V/div, time: 10μs/div, and the duty cycle D is about 0.66. As can be seen from the eighth figure, the voltage stress v _D1 = v _D3 = (V _c1 - V _in )/2 = 47.5V, And v _D2 = V _in = 25 V.

Referring to FIG. 9 , when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W, the switching switch (10) and the fourth two are operated according to the embodiment of the present invention. The analog waveform of the polar body (127) and the voltage of the output diode (131) (ie, v _S1 , v _{D4 ,} and v _Do ), the scale value of the waveform diagram is: v _S1 /v _D4 / v _Do :100V /div, time: 10μs/div, and the duty cycle D is about 0.66. As can be seen from the ninth figure, the voltage stress v _S1 = v _D4 = V _c1 = 120 V, and v _Do = V _o - V _c2 = 120 V.

With a tenth See figure, the embodiment operates in the input voltage Vin is 25V, the output voltage V _o is 200V, full output power of 200W, flowing through the first inductor (121) system of the present invention, the second inductor (122) and the analog waveform of the current of the third inductor (123) (ie, i _L1 , i _{L2 ,} and i _L3 ), the scale value of the waveform diagram is: i _L1 /i _L2 /i _L3 : 5A/div, Time: 10 μs/div, and the duty cycle D is about 0.66. It can be seen from the tenth figure that it operates in continuous conduction mode.

Referring to FIG. 11 and FIG. 12, the eleventh figure is an operation of the embodiment of the present invention when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W. Analog waveforms of the currents of the first diode (124), the second diode (125), and the third diode (126) (ie, i _D1 , i _{D2 ,} and i _D3 ), and the scale values of the waveforms For: i _D1 /i _D2 /i _D3 :5A/div, time: 10μs/div, and the duty cycle D is about 0.66. The twelfth embodiment is an embodiment of the present invention, when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W, flowing through the switch (120), the fourth diode (127) And the analog waveform of the current of the output diode (131) (ie, i _S1 , i _D4 and i _Do ), the scale value of the waveform diagram is: i _S1 /i _D4 /i _D0 :5A/div, time : 10 μs/div, and the duty cycle D is about 0.66. It can be seen from the eleventh and twelfth figures that the analysis is consistent with the aforementioned operation mode 1, mode 2 and mode 3.

Referring to FIG. 13 , it is a voltage gain graph of the high voltage gain power conversion device (1) according to an embodiment of the present invention, which can be seen to have a high voltage gain ratio.

In view of the foregoing description of the embodiments, the operation and the use of the present invention and the effects of the present invention are fully understood, but the above described embodiments are merely preferred embodiments of the present invention, and the invention may not be limited thereto. </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

(1)‧‧‧High voltage gain power conversion device
(11)‧‧‧ Input unit
(12)‧‧‧DC-DC converter circuit with high voltage gain
(121)‧‧‧First inductance
(122)‧‧‧second inductance
(123)‧‧‧ Third inductance
(124)‧‧‧First Diode
(125)‧‧‧Secondary diode
(126)‧‧‧ Third Dipole
(127)‧‧‧Fourth diode
(128)‧‧‧first capacitor
(129)‧‧‧second capacitance
(120)‧‧‧Switch
(13)‧‧‧Output unit
(131)‧‧‧ Output diodes
(132)‧‧‧ Output capacitance
(133)‧‧‧ Load
(A)‧‧‧Traditional boost type power conversion device
(A1)‧‧‧ Input
(A2)‧‧‧Inductors
(A3)‧‧‧Toggle switch
(A4)‧‧‧ Output diodes
(A5)‧‧‧ Output capacitance
(A6) ‧ ‧ load
(B)‧‧‧Switching Inductive Step-Up Power Conversion Device
(B1)‧‧‧ input
(B2) ‧ ‧ first diode
(B3) ‧ ‧ second diode
(B4) ‧‧‧ Third Dipole
(B5)‧‧‧Toggle switch
(B6)‧‧‧First Inductor
(B7) ‧‧‧second inductor
(B8)‧‧‧ Output diodes
(B9)‧‧‧ Output capacitance
(B0) ‧ ‧ load

[First FIG. 1] is a circuit diagram of a high voltage gain power conversion device according to an embodiment of the present invention.

[Second diagram] is a waveform diagram of a high voltage gain power conversion device according to an embodiment of the present invention in a single switching period.

[Third Diagram] is a current path diagram of the high voltage gain power conversion apparatus operating in mode 1 of the embodiment of the present invention.

[Fourth diagram] is a current path diagram of the high voltage gain power conversion device operating in mode 2 of the embodiment of the present invention.

[Fifth diagram] is a current path diagram of the high voltage gain power conversion device operating in mode 3 according to an embodiment of the present invention.

[Sixth Diagram] The input voltage Vin of the input unit, the voltage of the first capacitor Vc1, and the second operation when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W according to the embodiment of the present invention. The analog waveform of the voltage Vc2 of the capacitor and the output voltage Vo of the output unit, the scale value of the waveform diagram is: Vin/Vc1/Vc2/Vo: 50 V/div, time: 10 ms/div.

[Seventh figure] is the operation of the embodiment of the present invention when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W, the voltage VL1 across the first inductor, the voltage VL2 of the second inductor, and The analog waveform of the voltage VL3 of the third inductor has a scale value of VL1/VL2/VL3: 50 V/div and time: 10 μs/div.

[Eighth image] is an embodiment of the present invention, when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W, the voltage V _D1 across the first diode and the second diode The analog waveform of the body voltage V _D2 and the voltage of the third diode V _D3 is as follows: VD1/VD2/VD3: 50 V/div, time: 10 μs/div.

[Ninth aspect] is the voltage V _{S1 of the} switching switch and the voltage of the fourth diode when the input voltage V _in is 25V, the output voltage V _o is 200V, and the full-load output power is 200W according to the embodiment of the present invention. The analog waveform of V _D4 and the voltage of the output diode V _Do , the scale value of the waveform diagram is: VS1/VD4/VDo: 100 V/div, time: 10 μs/div.

Operation Example embodiment [FIG tenth] of the present invention is based upon the input voltage V _in is 25V, the output voltage V _o is 200V, full output power of 200W, the current flowing through the first inductor i _L1, the second inductor current i The analog waveform of the current i _L3 of _L2 and the third inductor, the scale value of the waveform diagram is: iL1/iL2/iL3: 5 A/div, time: 10 μs/div.

[11] is the current flowing through the first diode, i _D1 , and the second operation when the input voltage V _in is 25 V, the output voltage V _o is 200 V, and the full-load output power is 200 W according to an embodiment of the present invention. The analog waveform of the current of the polar body i _D2 and the current of the third diode i _D3 is as follows: iD1/iD2/iD3: 5 A/div, time: 10 μs/div.

[Twelfth] is a current flowing through the switch, i _S1 , and a fourth diode when the input voltage V _in is 25 V, the output voltage V _o is 200 V, and the full-load output power is 200 W according to an embodiment of the present invention. The analog waveform of the current i _D4 and the current i _Do of the output diode, the scale value of the waveform diagram is: iS1/iD4/iDo: 5 A/div, time: 10 μs/div.

[Thirteenth Figure] is a voltage gain graph of a high voltage gain power conversion device according to an embodiment of the present invention.

[Fourteenth] is a circuit diagram of a conventional conventional step-up power conversion device.

[Fifteenth] is a circuit diagram of a switching inductive step-up power converter.

(1)‧‧‧High voltage gain power conversion device

(11)‧‧‧ Input unit

(12)‧‧‧DC-DC converter circuit with high voltage gain

(121)‧‧‧First inductance

(122)‧‧‧second inductance

(123)‧‧‧ Third inductance

(124)‧‧‧First Diode

(125)‧‧‧Secondary diode

(126)‧‧‧ Third Dipole

(127)‧‧‧Fourth diode

(128)‧‧‧first capacitor

(129)‧‧‧second capacitance

(120)‧‧‧Switch

(13)‧‧‧Output unit

(131)‧‧‧ Output diodes

(132)‧‧‧ Output capacitance

(133)‧‧‧ Load

Claims (4)

A high voltage gain power conversion device includes: an input unit that inputs a direct current; a high voltage gain DC-DC conversion circuit, the side of the high voltage gain DC-DC conversion circuit is electrically connected to the foregoing An input unit, wherein the DC-DC conversion circuit with a high step-up ratio comprises a first inductor, a second inductor, a third inductor, a first diode, a second diode, and a third a diode, a fourth diode, a first capacitor, a second capacitor, and a switch; wherein the first inductor and the second inductor have the same inductance, and the first diode is The extreme end is electrically connected to one end of the input unit and one end of the second inductor, and the cathode end of the first diode is electrically connected to one end of the first inductor and the cathode end of the second diode, the first The anode end of the diode is electrically connected to the other end of the second inductor and the anode end of the third diode, and the cathode end of the third diode is electrically connected to the other end of the first inductor, One end of the second capacitor, the fourth diode Extremely connected to one end of the switch, the other end of the second capacitor is electrically connected to one end of the third inductor, and the other end of the third inductor is electrically connected to the cathode end of the fourth diode and the first end One end of the capacitor, the other end of the first capacitor is electrically connected to the other end of the switch and the other end of the input unit; and an output unit electrically connected to the DC-DC with high voltage gain On the other side of the conversion circuit, the output unit includes an output diode, an output capacitor, and a load, wherein an anode end of the output diode is electrically connected to the other end of the second capacitor, and the output diode The cathode end of the body is electrically connected to one end of the output capacitor and one end of the load, and the other end of the output capacitor is electrically connected to the other end of the load to the other end of the first capacitor; Direct current to the DC-DC conversion circuit with high voltage gain, when the switch is turned on, the input unit stores energy by the DC energy to the first inductor and the second inductor, the first Capaciting and releasing energy to the third inductor and the second capacitor to store, and the output capacitor releases energy to the load, when the switch is turned off, the input unit, the first inductor, the second inductor, the second The capacitor, the first capacitor, and the third inductor release energy to the output capacitor and the load, wherein a voltage gain ratio of the output unit to the input unit is (1+D) ² /(1-D), wherein , D is the duty cycle, and D is between 0 and 1. The high voltage gain power conversion device according to claim 1, wherein the switch is turned on and off by a pulse width modulation technique. The high voltage gain power conversion device of claim 1, wherein the input unit inputs direct current to one of a solar cell or a fuel cell. The high voltage gain power conversion device of claim 1, wherein the switching relationship is an N-type metal oxide semiconductor field effect transistor.