KR101849901B1 - Three Phase Interleaved Solar Converter Suitable for Low-Voltage High-Current - Google Patents

Abstract

A three-phase interleaved solar converter according to the present invention includes: a solar cell (100) for receiving solar light to generate electricity; First to third converters 31 to 33 that receive a voltage generated from the solar cell 100 and convert the power; The first converter 31 is composed of an upper switch 31-1 and a lower switch 31-2 of the first converter 31. The upper switch 31-1 and the lower switch 31-2 A first inductor 41 connected to a contact of the first inductor 41; The second converter 32 is composed of an upper switch 32-1 and a lower switch 32-2 of the second converter 32. The upper switch 32-1 and the lower switch 32-2 A second inductor 42 connected to a contact of the second inductor 42; The third converter 33 is composed of an upper switch 33-1 and a lower switch 33-2 of the third converter 33. The upper switch 33-1 and the lower switch 33-2 A third inductor 43 connected to a contact of the first inductor 43; The first inductor 41, the second inductor 42, and the third inductor 43 form a magnetic coupling 44 on one core; First to third current sensors 51 to 53 for detecting the first to third output currents io1 to io3 of the first to third converters 31 to 33; First to third current comparators 221 to 223 of a current controller 220 for comparing the first to third output currents io1 to io3 with a reference current value iref; First and second voltage detecting resistors (54, 55) for detecting an output voltage (Vo) of the three-phase interleaved solar converter; A voltage controller 210 for comparing the output voltage Vo with a reference voltage Vref1 and outputting a control voltage Vc; A first control comparator 241 for comparing an output of the first current comparator 221 with a control voltage Vc of the voltage controller 210; A third control comparator 243 for comparing the output of the second current comparator 222 with the control voltage Vc of the voltage controller 210; A fifth control comparator 245 for comparing the output of the third current comparator 223 with the control voltage Vc of the voltage controller 210; A second control comparator (242) for comparing the output of the first current comparator (221) with the reference current value (IrefA) of the first converter (31); A fourth control comparator 244 for comparing the output of the second current comparator 222 with the reference current value IrefB of the second converter 32; A sixth control comparator (246) for comparing the output of the third current comparator (223) with the reference current value (IrefC) of the third converter (33); A first control OR gate 247 for generating a gate signal of the first converter 31 by ORing the output of the first control comparator 241 and the output of the second control comparator 242; A second control OR gate 248 for generating a gate signal of the second converter 32 by ORing the output of the third control comparator 243 and the output of the fourth control comparator 244; And a third control OR gate 249 for generating a gate signal of the third converter 33 by ORing the output of the fifth control comparator 245 and the output of the sixth control comparator 246 Phase interleaved photovoltaic converter.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase interleaved solar converter suitable for low voltage,

There is a growing demand for pollution-free power generation globally or nationally, and there is growing interest in photovoltaic power generation as a substitute for nuclear power and thermal power generation. The present invention relates to a solar photovoltaic power conversion apparatus for transferring power generated in a solar cell to a low-voltage high-current direct current (DC) load, and a voltage ripple of a direct current (DC) And a three-phase interleaved solar light converter for improving efficiency.

In recent years, interest in renewable energy has increased, and a solar panel is a device that functions to convert sunlight into electrical energy.

Fig. 1 shows the principle of solar power generation. A solar panel refers to a semiconductor device that converts sunlight into electrical energy using photoelectric effect. When the photovoltaic effect receives solar light on the contact surface of the metal and the semiconductor or the p-n junction of the semiconductor, electrons and holes are formed in the semiconductor. The electrons move to the front electrode, and the holes move to the rear electrode. Thereby, a voltage difference is generated between the front electrode and the rear electrode, and the electrons and the electrons move to the electric load. Generally, since the current flow is defined as the direction of the hole movement, the (+) voltage is generated electrically at the back electrode and the (-) voltage is generated at the front electrode.

Various inventions have conventionally been conducted on a method of converting power from a solar cell or a DC power source.

As a related prior art, a DC-DC converter having a wide input voltage control range has been disclosed in Korean Patent Registration No. 10-1304777, Publication Date 2013. 09. 05 (hereinafter referred to as "Patent Document 1"). Patent Document 1 discloses a technique in which an interleaved flyback converter and an LLC resonant converter are combined to transfer electric energy generated from a solar cell having a wide input range to a load, DC converter for generating a DC voltage.

As another prior art, Korean Patent Laid-Open Publication No. 10-2018-0003122, Publication Date 2018.01.09 (hereinafter referred to as "Patent Document 2") proposes an interleaved LLC resonant converter and a control method thereof. [Patent Reference 2] discloses a resonant converter that operates in parallel with N LLC resonant converters constituted by a full bridge circuit and supplies power to a load, and a control method thereof.

However, in the above-described Patent Documents 1 and 2, an interleaved converter system has been proposed, but the energy generated in the solar cell can not be optimized for a low-voltage-large current system.

[Patent Document 1] Korean Registered Patent No. 10-1304777, Published on March 23, 2013. [Patent Document 2] Korean Patent Laid-Open Publication No. 10-2018-0003122, publication date 2018.01.09. [Patent Document 3] Korean Registered Patent No. 10-1500206, Published Date 2015. 03. 06.

The present invention proposes a solar power conversion apparatus for transferring power generated in a solar cell to a low-voltage-high current direct current (DC) load. The three-phase interleaved method is applied to meet the low-voltage-current output. In addition, it is composed of six switches for stable control of three-phase interleaved solar converters. It performs stable rectification supply by using a magnetic coupling (44) composed of a single core, and newly proposed average current and maximum The present invention provides a device capable of supplying power generated in a solar cell to a DC (DC) load of a low voltage, a large current, using the current variable control method most stably.

The present invention proposes a three-phase interleaved circuit composed of six switches for a three-phase interleaved solar converter suitable for a low-voltage-current system. The three-phase interleaved circuit has the advantage that the three power supplies operate alternately to supply power and reduce the output current ripple as much as possible. Second, the magnetic coupling 44 composed of a single core has the advantage that, , The number of inductors used in the circuit is reduced to a minimum. Third, a low-voltage, large-current method capable of stable current control through the most optimal current control by introducing an average current and maximum current control method And to provide a suitable three-phase interleaved solar converter.

In the present invention, the three-phase interleaved circuit through the three-phase interleaved solar converter suitable for the low-voltage and high current method proposed in the present invention operates by alternating the three power supplies to supply power, Second, since the magnetic coupling 44 composed of a single core is used, the number of cores is minimized. Third, the average current and maximum current variable control method Stable current control is possible through the most optimal current control. Fourth, stable output can be achieved even at high current output of several tens [A] to several hundred [A] through introduction of precise current and voltage controller. Fifth, (DC) load 59, that is, a load whose heavy load is equal to or more than 50% of the rated current, the first to third converters 31, The first to third converters 31 to 33 can balance the current as a whole and the DC (DC) load 59 does not require a large amount of current , That is, a load whose light load is less than 50% of the rated current] has an increased effect of operating in the maximum current mode.

Fig. 1 is a view showing a solar power generation principle
FIG. 2 is a conceptual diagram of a three-phase interleaved solar light converter
3 is a schematic diagram of a three-phase interleaved solar converter circuit
4 is a detailed circuit diagram of a three-phase interleaved solar converter
FIG. 5 is a cross-
Figure 6 shows a first voltage controller type
Figure 7 shows a second voltage controller type
Figure 8 shows a third voltage controller type
9 is a graph showing the average current control method of a three-phase interleaved solar converter
Fig. 10 is a graph showing the maximum current control method of a three-phase interleaved solar converter
11 is a graph showing the average current and maximum current variable control method of the proposed three-phase interleaved solar converter

The present invention will now be described in detail with reference to the accompanying drawings.
2 is a conceptual diagram of a three-phase interleaved solar light converter according to the present invention.
In the conceptual diagram of the three-phase interleaved solar light converter (FIG. 3), a solar cell 100 connected in parallel is located, and the solar cell 100 connected in parallel is connected to the first through fifth (+) Terminals of the first to fifth solar battery cells (Cells) 11 to 15 are connected in parallel to each other, and the first to fifth reverse voltage protection circuits Diodes 21 to 25 are disposed.
The output of the solar cell 100 connected in parallel is smoothed by the input capacitor 27 and output through the first to third converters 31 to 33 controlled in an interleaved manner DC) load 59. In this way, The main control unit 70 receives the first to third currents 31 to 33 from the first to third current sensors 51 to 53 which respectively detect the output currents of the first to third converters 31 to 33, And controls the switches S1, S2 and S3 of the first to third converters 31 to 33 by detecting the output voltage information from the output voltage detector 58 .
3 shows a circuit diagram of a three-phase interleaved solar converter.
In the circuit diagram of the three-phase interleaved solar converter (FIG. 3), a solar cell 100 connected in parallel is disposed, and the solar cell 100 connected in parallel is connected to the first through fifth (+) Terminals of the first to fifth solar battery cells (Cells) 11 to 15 are connected in parallel to each other, and the first to fifth reverse voltage protection circuits Diodes 21 to 25 are disposed.
The output of the solar cell 100 connected in parallel is smoothed by the input capacitor 27 and output through the first to third converters 31 to 33 controlled in an interleaved manner DC) load 59. In this way, The main control unit 70 receives the first to third currents 31 to 33 from the first to third current sensors 51 to 53 which respectively detect the output currents of the first to third converters 31 to 33, And is input to the current detection unit 72 of the main control unit 70. [ The main control unit 70 detects the output voltage information from the output voltage detector 58 and amplifies the first and second control gains Z1 and Z2 60 and 61 so that the voltage of the main control unit 70 Is input to the detection unit (73).
The main control unit 70 controls each switch of the three-phase interleaved power conversion circuit unit 300 in the main switch driving unit 71 through a three-phase interleaved solar converter controller (FIG. 3).
In the present invention, in order to minimize the number of inductors (cores) and reduce the output current ripple, the first to third inductors 41 to 43 have a magnetic coupling 44 in one core. do. Since the magnetic coupling 44 composed of a single core is used, there is an increased effect of minimizing the number of cores.
4 shows a detailed circuit diagram of a three-phase interleaved solar converter.
In the circuit diagram of the three-phase interleaved solar converter (FIG. 4), a solar cell 100 connected in parallel is located, and the solar cell 100 connected in parallel is connected to the first through fifth (+) Terminals of the first to fifth solar battery cells (Cells) 11 to 15 are connected in parallel to each other, and the first to fifth reverse voltage protection circuits Diodes 21 to 25 are disposed.
The output of the solar cell 100 connected in parallel is smoothed by the input capacitor 27 and output through the first to third converters 31 to 33 controlled in an interleaved manner DC) load 59. In this way, The main control unit 70 receives the first to third currents 31 to 33 from the first to third current sensors 51 to 53 which respectively detect the output currents of the first to third converters 31 to 33, And is input to the current detection unit 72 of the main control unit 70. [ The main control unit 70 detects the output voltage information from the output voltage detector 58 and amplifies the first and second control gains Z1 and Z2 60 and 61 so that the voltage of the main control unit 70 Is input to the detection unit (73).
In the detailed circuit diagram (FIG. 4) of the three-phase interleaved solar converter, first to third currents from the first to third current sensors 51 to 53, which are outputs of the first to third converters 31 to 33, The detection information of the currents io1 to io3 is compared with the reference current value iref through the current control unit 220 through the current detection unit 72. [ The first current comparator 221 compares the first output current io1 with the reference current iref and the second current comparator 222 compares the second output current io2 with the reference current iref, And the third current comparator 223 compares the third output current io1 with the reference current value iref.
The voltage detected through the first and second voltage detecting resistors 54 and 55 through the output voltage Vo is amplified through the amplification of the first and second control gains Z1 and Z2 (60 and 61) Is input to the voltage detector (73) of the microcomputer (70). The voltage control unit 210 outputs the control voltage Vc through amplification of the first and second control gains Z1 and Z2 60 and 61 in comparison with the reference voltage Vref1 for output control.
The gate signal generator 240 receives the control voltage Vc output from the voltage controller 210 and the outputs of the first through third current comparators 221 through 223. The first, third and fifth control comparators of the gate signal generator 240 compare the control voltage Vc output from the voltage controller 210 with the outputs of the first through third current comparators 221 through 223 do.
The second control comparator compares the output of the first current comparator 221 with the first converter reference current value IrefA and the fourth control comparator compares the output of the second current comparator 222 with the output of the second converter comparator 222. [ And the sixth control comparator compares the output of the third current comparator 223 with the third converter reference current value IrefC.
The first control OR gate 247 outputs the output of the first control comparator 241 and the output of the second control comparator 242 under the OR condition and the second control OR gate 248 outputs the output of the second control comparator 242, The third control OR gate 249 outputs the output of the fourth control comparator 246 and the output of the fourth control comparator 246 as an OR condition, Is outputted as an OR condition, and a gate signal is generated.
The outputs of the first to third control OR gates 247 to 249 of the gate signal generator 240 for each switch control of the first to third converters 31 to 33 are input to the RS flip- The first RS flip-flop 261 receives the output of the first OR gate 247 and the first oscillator pulse PH1 to output a gate signal at the first RS flip-flop 261, The second RS flip-flop 262 receives the output of the second OR gate 248 and the second oscillator pulse PH2 to output a gate signal to the second RS flip-flop 261, and the third RS flip- 3 OR gate 249 and the third oscillator pulse PH3 are input and the third RS flip-flop 263 outputs a gate signal. In addition, the gate signals drive the switches of the first to third converters 31 to 33 through the gate driver 270.
In the overvoltage and overcurrent protection unit 230, when the output voltage or the output current through the overvoltage and overcurrent protection comparator 231 is equal to or higher than the reference voltage Vref2 for overvoltage and overcurrent control, the first to third converters 31 to 33 ), Thereby increasing the efficiency of protecting the three-phase interleaved solar converter suitable for the low-voltage-current scheme.
Figure 5 shows magnetic coupling using a single core.
In a magnetic coupling using a single core (FIG. 5), winding is wound around each core leg and the first to third inductors 41 to 43 form a magnetic coupling 44 do.
6 to 8 show the first to third voltage controller types.
6, the first control gain Z1 60 is a first control resistance R1 and the second control gain Z2 61 is an eleventh control resistance R11. And an eleventh control capacitor C11 are connected in series and a twelfth control capacitor C12 is formed in parallel with the eleventh control resistance R11 and the eleventh control capacitor C11.
The first control resistor R1 and the first capacitor C1 are connected in parallel and the first control resistor R1 and the second control resistor R1 are connected in parallel, And the second control resistance Z2 61 is constituted by the first capacitor C1 and the second control resistor R2 in series and the eleventh control resistor R11 and the eleventh control capacitor C11 are connected in series .
8) includes a second control resistor R2 and a first capacitor C1 in parallel with the first control resistor R1, and the first control resistor Z1 (60) The second control gain Z2 61 is connected to the eleventh control resistor R11 and the eleventh control capacitor C11 in series and the control gain R11 and the eleventh control capacitor C11 are connected in parallel to the eleventh control resistance R11 and the eleventh control capacitor C11. And a twelfth control capacitor C12.
9 shows an average current control method of a three-phase interleaved solar converter.
The first to third converters 31 to 33 output first to third currents from the first to third current sensors 51 to 53 respectively detecting the output currents of the first to third converters 31 to 33, The currents io1 to io3 are detected and shared to form a shared voltage bus 307. [
The output of the three-phase interleaved solar converter 200 outputs the first parallel operation control voltage Vc1 from the current sensor 50 through the parallel operation current monitor unit 303 of the specific converter, A parallel operation resistor 304 is disposed between a voltage bus line 307 and the parallel operation current monitor 303 and a voltage of both ends of the parallel operation resistor 304 is connected to a parallel operation current comparator 303. [ The error is detected by sensing the error signal 306. Since the parallel operation current comparator 306 detects and reduces the error between the shared bus voltage Vbus and the first parallel operation control voltage Vc1, the average current control method of the three-phase interleaved solar converter .
In addition, the parallel operation adder 301 outputs the error of the parallel operation current comparator 306 and the parallel operation reference voltage Vref3, and finally outputs the three-phase interleaved solar light And controls the converter (200).
10 shows a maximum current control method of a three-phase interleaved solar converter.
The first to third converters 31 to 33 output first to third currents from the first to third current sensors 51 to 53 respectively detecting the output currents of the first to third converters 31 to 33, The currents io1 to io3 are detected and shared to form a shared voltage bus 307. [
The output of the three-phase interleaved solar converter 200 outputs the first parallel operation control voltage Vc1 from the current sensor 50 through the parallel operation current monitor unit 303 of the specific converter, A parallel operation diode 305 is arranged between a voltage bus line 307 and a parallel operation current monitoring unit 303 and the voltage of the parallel operation diode 305 is connected to a parallel operation current comparator 306 And the error is detected through sensing. Since the parallel operation current comparator 306 always detects and reduces the maximum error of the shared bus voltage Vbus and the first parallel operation control voltage Vc1 and is controlled based on the maximum current, It is said to be the maximum current control method of solar photovoltaic converter.
In addition, the parallel operation adder 301 outputs the error of the parallel operation current comparator 306 and the parallel operation reference voltage Vref3, and finally outputs the three-phase interleaved solar light And controls the converter (200).
11 shows an average current and maximum current variable control scheme of the proposed three-phase interleaved solar converter.
The first to third converters 31 to 33 output first to third currents from the first to third current sensors 51 to 53 respectively detecting the output currents of the first to third converters 31 to 33, The currents io1 to io3 are detected and shared to form a shared voltage bus 307. [
The output of the three-phase interleaved solar converter 200 outputs the first parallel operation control voltage Vc1 from the current sensor 50 through the parallel operation current monitor unit 303 of the specific converter, A parallel operation diode 305 is disposed between a voltage bus line 307 and the parallel operation current monitor unit 303. The parallel operation diode 305 and the parallel operation resistance 304 and the N- (311) are connected in parallel.
11 shows that the shared bus voltage Vbus is detected by the first and second parallel operation feedback resistors 314 and 315 and the output voltage of the regulator 312 to the reference voltage. The regulator 312 uses a device of TL431 and operates at a reference voltage of 2.5 [V].
The anode of the regulator 312 is input to the control unit power supply Vcc and when the shared bus voltage Vbus is equal to or higher than the reference voltage, the regulator 312 is made conductive from the anode to the cathode The voltage is applied to the regulator connection resistor 313 and the N type transistor 311 is turned on so that the parallel operation resistance 304 becomes conductive and operates in the average current mode.
Therefore, if the shared bus voltage Vbus is less than or equal to the reference voltage, it operates in the maximum current mode. If the shared bus voltage Vbus is equal to or greater than the reference voltage, .
That is, in light load (load where the output current is less than 50% of the rated current), it operates in the maximum current mode, and heavy load [output load] is 50 (DC) load 59 requires a large amount of current, that is, when a heavy load (load current) is applied to a rated current The currents are controlled on average from the first to third converters 31 to 33 at a load of 50% or more of the first to third converters 31 to 33, , And operates in the maximum current mode when the DC (DC) load 59 does not require much current, that is, when the light load is less than 50% of the rated current. As a technical feature.
The voltage of the parallel operation diode 305 or the parallel operation resistance 304 is sensed in the parallel operation current comparator 306 to detect the error. The parallel operation current comparator 306 is a method of always detecting and reducing the maximum error or average error of the shared bus voltage Vbus and the first parallel operation control voltage Vc1, The average current and maximum current control method of the three-phase interleaved solar converter is referred to as a control method.
In addition, the parallel operation adder 301 outputs the error of the parallel operation current comparator 306 and the parallel operation reference voltage Vref3, and finally outputs the three-phase interleaved solar light And controls the converter (200).
If a large amount of current is required in the DC (DC) load 59, that is, in the heavy load, the currents are controlled on average on the first to third converters 31 to 33, The first to third converters 31 to 33 can balance the current and when the DC (DC) load 59 does not require a large amount of current, that is, in the light load, Effect is generated.

Accordingly, in the present invention, a three-phase interleaved solar converter includes: a solar cell (100) that receives solar light to generate electricity; First to third converters 31 to 33 that receive a voltage generated from the solar cell 100 and convert the power; The first converter 31 is composed of an upper switch 31-1 and a lower switch 31-2 of the first converter 31. The upper switch 31-1 and the lower switch 31-2 A first inductor 41 connected to a contact of the first inductor 41; The second converter 32 is composed of an upper switch 32-1 and a lower switch 32-2 of the second converter 32. The upper switch 32-1 and the lower switch 32-2 A second inductor 42 connected to a contact of the second inductor 42; The third converter 33 is composed of an upper switch 33-1 and a lower switch 33-2 of the third converter 33. The upper switch 33-1 and the lower switch 33-2 A third inductor 43 connected to a contact of the first inductor 43; The first inductor 41, the second inductor 42, and the third inductor 43 form a magnetic coupling 44 on one core; First to third current sensors 51 to 53 for detecting the first to third output currents io1 to io3 of the first to third converters 31 to 33; First to third current comparators 221 to 223 of a current controller 220 for comparing the first to third output currents io1 to io3 with a reference current value iref; First and second voltage detecting resistors (54, 55) for detecting an output voltage (Vo) of the three-phase interleaved solar converter; A voltage controller 210 for comparing the output voltage Vo with a reference voltage Vref1 and outputting a control voltage Vc; A first control comparator 241 for comparing an output of the first current comparator 221 with a control voltage Vc of the voltage controller 210; A third control comparator 243 for comparing the output of the second current comparator 222 with the control voltage Vc of the voltage controller 210; A fifth control comparator 245 for comparing the output of the third current comparator 223 with the control voltage Vc of the voltage controller 210; A second control comparator (242) for comparing the output of the first current comparator (221) with the reference current value (IrefA) of the first converter (31); A fourth control comparator 244 for comparing the output of the second current comparator 222 with the reference current value IrefB of the second converter 32; A sixth control comparator (246) for comparing the output of the third current comparator (223) with the reference current value (IrefC) of the third converter (33); A first control OR gate 247 for generating a gate signal of the first converter 31 by ORing the output of the first control comparator 241 and the output of the second control comparator 242; A second control OR gate 248 for generating a gate signal of the second converter 32 by ORing the output of the third control comparator 243 and the output of the fourth control comparator 244; And a third control OR gate 249 for generating a gate signal of the third converter 33 by ORing the output of the fifth control comparator 245 and the output of the sixth control comparator 246 Phase interleaved photovoltaic converter.

A current adder (225) for adding the output of the first current comparator (221), the output of the second current comparator (222) and the output of the third current comparator (223); The output of the current adder 225 is compared with a reference voltage Vref2 for overvoltage and overcurrent control to generate a signal to turn off all switches of the three-phase interleaved solar converter at the time of over current occurrence And an overcurrent and overcurrent protection comparator (231).
The output voltage Vo is compared with a reference voltage Vref2 for overvoltage and overcurrent control to generate a signal to turn off all the switches of the three-phase interleaved solar converter when an overvoltage occurs And an overcurrent protection comparator (231).
The output of the first to third control OR gates 247 to 249 and the first to third oscillator pulses PH1 to PH3 of the gate signal generator 240 are input to the switches of the three- And an RS flip-flop 260 for generating a gate signal to turn on or off the signal.

A shared bus line 307 sharing the first through third output currents io1 through io3 from the first through third current sensors 51 through 53; A parallel operation current monitor unit 303 for outputting the first parallel operation control voltage Vc1 of the specific converter through the specific current sensor among the current sensors 51 to 53; A parallel operation diode 305 disposed between the shared voltage bus line 307 and the parallel operation current monitor unit 303; A parallel operation controller including a parallel operation resistor 304 and an N-type transistor 311 arranged in parallel with the parallel operation diode 305 is used to operate the DC (DC) Currents are controlled on average from the first to third converters 31 to 33 at a load of [Heavy Load: 50% or more of the rated current], and the DC (DC) load 59 Phase interleaved photovoltaic converter characterized in that it operates in the maximum current mode at a light load where the output current is less than 50% of the rated current, I would like to propose.

The present invention can be applied to a three-phase interleaved solar photoconductor suitable for a low-voltage-high current system by various modifications by a person skilled in the art, As a result of this.

11: First solar cell (Cell)
12: Second solar cell (Cell)
13: Third Solar Cell (Cell)
14: Fourth solar cell (Cell)
15: fifth solar cell (Cell)
21: first reverse voltage prevention diode
22: a second reverse voltage prevention diode
23: a third reverse voltage prevention diode
24: fourth reverse-blocking diode
25: fifth reverse-blocking diode
27: Input capacitor
31: First converter
31-1: upper switch of the first converter
31-2: Lower switch of the first converter
32: second converter
32-1: upper switch of the second converter
32-2: Lower switch of the second converter
33: Third converter
33-1: upper switch of the third converter
33-2: Lower switch of the third converter
41: first inductor
42: Second inductor
43: third inductor
44: magnetic coupling
50: Current sensor
51: first current sensor
52: second current sensor
53: third current sensor
54: first voltage detecting resistor
55: second voltage detecting resistor
57: Output capacitor
58: Output voltage detector
59: DC (DC) load
60: first control gain (Z1)
61: second control gain (Z2)
70:
71: Main switch driving part
72: current detector
73: Voltage detector
100: Solar cell (Cell)
200: Three-phase interleaved solar converter
201: first control unit resistance
202: first control capacitor
203: second capacitor
204: second resistance
205: third capacitor
206: Third resistance
207: fourth resistor
208: fifth resistor
209: fourth capacitor
210:
211: Voltage comparator
220:
221: first current comparator
222: second current comparator
223: a third current comparator
225: current adder
230: Overvoltage and overcurrent protection
231: Overvoltage and Overcurrent Protection Comparator
232: 3.3 [V] reference voltage generator
233: Resistance of the first overvoltage protector
234: Second Overvoltage Protection Resistance
240: Gate signal generator
241: first control comparator
242: second control comparator
243: third control comparator
244: fourth control comparator
245: fifth control comparator
246: sixth control comparator
247: first control OR gate
248: second control OR gate
249: third control OR gate
260: RS flip-flop
261: first RS flip-flop
262: second RS flip-flop
263: third RS flip-flop
270: Gate driver
271: Gate driver of the first converter
271-1: Upper gate buffer of the first converter
271-2: the lower gate of the first converter, Not gate
272: Gate driver of the second converter
272-1: Upper gate buffer of the second converter
272-2: the lower gate of the second converter, Not gate
273: Gate driver of the third converter
273-1: Upper gate buffer of the third converter
273-2: Lower gate of third converter Not gate
280:
282: Oscillator Resistance
300: Three-phase interleaved power conversion circuit section
301: Parallel operation adder
302: Parallel operation voltage comparing unit
303: Parallel operation current monitor section
304: Parallel operation resistance
305: Parallel operation diode
306: Parallel operation current comparator
307: Shared Voltage Bus Line (Share Bus)
311: N-type transistor
312: Regulator
313: Regulator connection resistance
314: 1st parallel operation feedback resistance
315: 2nd parallel operation feedback resistance
A: Contact points of the upper and lower switches of the first converter
B: contacts of the upper and lower switches of the second converter
C: contacts of the upper and lower switches of the third converter
C1: first control capacitor
C11: Eleventh control capacitor
C12: Twelfth control capacitor
FAULT: switch off (off)
io1: 1st output current
io2: Second output current
io3: Third output current
Iref: reference current value
OSC: Oscillator (Oscillator)
PH1: first oscillator pulse
PH2: second oscillator pulse
PH3: third oscillator pulse
R1: first control resistance
R2: second control resistance
R11: eleventh control resistance
S1: Main switch of the first converter (upper and lower switches)
S2: the main switch of the second converter (upper and lower switches)
S3: Main switch of the third converter (upper and lower switches)
T: (+) terminal of DC (DC) load
Vc: Control voltage
Vcc: Control power
Vc1: First parallel operation control voltage
Vc2: second parallel operation control voltage
Vref1; Reference voltage for output control
Vref2: Reference voltage for overvoltage and overcurrent control
Vref3: Parallel operation reference voltage
IrefA: first converter reference current value
IrefB: second converter reference current value
IrefC: third converter reference current value
Z1: first control gain
Z2: second control gain

Claims (12)

A three-phase interleaved solar converter comprising:
A solar cell 100 that receives solar light to generate electricity;
First to third converters 31 to 33 that receive a voltage generated from the solar cell 100 and convert the power;
The first converter 31 is composed of an upper switch 31-1 and a lower switch 31-2 of the first converter 31. The upper switch 31-1 and the lower switch 31-2 A first inductor 41 connected to a contact of the first inductor 41;
The second converter 32 is composed of an upper switch 32-1 and a lower switch 32-2 of the second converter 32. The upper switch 32-1 and the lower switch 32-2 A second inductor 42 connected to a contact of the second inductor 42;
The third converter 33 is composed of an upper switch 33-1 and a lower switch 33-2 of the third converter 33. The upper switch 33-1 and the lower switch 33-2 A third inductor 43 connected to a contact of the first inductor 43;
The first inductor 41, the second inductor 42, and the third inductor 43 form a magnetic coupling 44 on one core;
First to third current sensors 51 to 53 for detecting the first to third output currents io1 to io3 of the first to third converters 31 to 33;
First to third current comparators 221 to 223 of a current controller 220 for comparing the first to third output currents io1 to io3 with a reference current value iref;
First and second voltage detecting resistors (54, 55) for detecting an output voltage (Vo) of the three-phase interleaved solar converter;
A voltage controller 210 for comparing the output voltage Vo with a reference voltage Vref1 and outputting a control voltage Vc;
A first control comparator 241 for comparing an output of the first current comparator 221 with a control voltage Vc of the voltage controller 210;
A third control comparator 243 for comparing the output of the second current comparator 222 with the control voltage Vc of the voltage controller 210;
A fifth control comparator 245 for comparing the output of the third current comparator 223 with the control voltage Vc of the voltage controller 210;
A second control comparator (242) for comparing the output of the first current comparator (221) with the reference current value (IrefA) of the first converter (31);
A fourth control comparator 244 for comparing the output of the second current comparator 222 with the reference current value IrefB of the second converter 32;
A sixth control comparator (246) for comparing the output of the third current comparator (223) with the reference current value (IrefC) of the third converter (33);
A first control OR gate 247 for generating a gate signal of the first converter 31 by ORing the output of the first control comparator 241 and the output of the second control comparator 242;
A second control OR gate 248 for generating a gate signal of the second converter 32 by ORing the output of the third control comparator 243 and the output of the fourth control comparator 244;
And a third control OR gate 249 for generating a gate signal of the third converter 33 by ORing the output of the fifth control comparator 245 and the output of the sixth control comparator 246 Phase interleaved solar converter < RTI ID = 0.0 > A three-phase interleaved solar converter comprising:
A solar cell 100 that receives solar light to generate electricity;
First to third converters 31 to 33 that receive a voltage generated from the solar cell 100 and convert the power;
The first converter 31 is composed of an upper switch 31-1 and a lower switch 31-2 of the first converter 31. The upper switch 31-1 and the lower switch 31-2 A first inductor 41 connected to a contact of the first inductor 41;
The second converter 32 is composed of an upper switch 32-1 and a lower switch 32-2 of the second converter 32. The upper switch 32-1 and the lower switch 32-2 A second inductor 42 connected to a contact of the second inductor 42;
The third converter 33 is composed of an upper switch 33-1 and a lower switch 33-2 of the third converter 33. The upper switch 33-1 and the lower switch 33-2 A third inductor 43 connected to a contact of the first inductor 43;
The first inductor 41, the second inductor 42, and the third inductor 43 form a magnetic coupling 44 on one core;
First to third current sensors 51 to 53 for detecting the first to third output currents io1 to io3 of the first to third converters 31 to 33;
First to third current comparators 221 to 223 of a current controller 220 for comparing the first to third output currents io1 to io3 with a reference current value iref;
First and second voltage detecting resistors (54, 55) for detecting an output voltage (Vo) of the three-phase interleaved solar converter;
A voltage controller 210 for comparing the output voltage Vo with a reference voltage Vref1 and outputting a control voltage Vc;
A first control comparator 241 for comparing an output of the first current comparator 221 with a control voltage Vc of the voltage controller 210;
A third control comparator 243 for comparing the output of the second current comparator 222 with the control voltage Vc of the voltage controller 210;
A fifth control comparator 245 for comparing the output of the third current comparator 223 with the control voltage Vc of the voltage controller 210;
A second control comparator (242) for comparing the output of the first current comparator (221) with the reference current value (IrefA) of the first converter (31);
A fourth control comparator 244 for comparing the output of the second current comparator 222 with the reference current value IrefB of the second converter 32;
And a sixth control comparator (246) for comparing the output of the third current comparator (223) with the reference current value (IrefC) of the third converter (33) The method according to claim 1 or 2,
A shared voltage bus line (Share Bus) 307 sharing the first to third output currents io1 to io3 from the first to third current sensors 51 to 53;
A parallel operation current monitor unit 303 for outputting the first parallel operation control voltage Vc1 of the specific converter through the specific current sensor among the first to third current sensors 51 to 53;
A parallel operation diode 305 disposed between the shared voltage bus line 307 and the parallel operation current monitor unit 303;
A three-phase interleaved solar converter 309 comprising a parallel operating resistor 304 and an N-type transistor 311 arranged in parallel with the parallel operating diode 305, The method according to claim 1 or 2,
A current adder (225) for adding the output of the first current comparator (221), the output of the second current comparator (222) and the output of the third current comparator (223);
The output of the current adder 225 is compared with a reference voltage Vref2 for overvoltage and overcurrent control to generate a signal to turn off all switches of the three-phase interleaved solar converter at the time of over current occurrence Wherein the over-voltage and over-current protection comparator (231) The method according to claim 1 or 2,
And an overvoltage generating unit that generates a signal for turning off all the switches of the three-phase interleaved solar converter when the overvoltage is generated by comparing the output voltage Vo with a reference voltage Vref2 for controlling the overvoltage and the overcurrent, And an overcurrent protection comparator (231). The three-phase interleaved solar converter The method according to claim 1,
The output of the first to third control OR gates 247 to 249 and the first to third oscillator pulses PH1 to PH3 of the gate signal generator 240 are input to the switches of the three- And an RS flip-flop (260) for generating a gate signal to turn on or off the output of the three-phase interleaved solar converter The method according to claim 1 or 2,
In the voltage controller of the three-phase interleaved solar converter, the first control gain (Z1) (60) consists of the first control resistor (R1);
The second control gain Z2 61 is a control gain which is obtained by connecting an eleventh control resistor R11 and an eleventh control capacitor C11 in series and in parallel with the eleventh control resistor R11 and eleventh control capacitor C11 And a twelfth control capacitor (C12). The three-phase interleaved solar converter The method according to claim 1 or 2,
In the voltage controller of the three-phase interleaved solar converter, the first control gain (R1) 60 is connected in parallel to the first control resistor R1 and the first capacitor C1, And a second control resistor (R2) in series with the first capacitor (C1);
The second control gain (Z2) 61 is obtained by connecting the eleventh control resistor R11 and the eleventh control capacitor C11 in series. The three-phase interleaved solar converter The method according to claim 1 or 2,
In the voltage controller of the three-phase interleaved solar converter, the first control gain (Z1) 60 is composed of the second control resistor R2 and the first capacitor C1 in parallel with the first control resistor R1;
The second control gain Z2 61 is connected in series with the eleventh control resistor R11 and the eleventh control capacitor C11 and is connected in parallel with the eleventh control resistor R11 and the eleventh control capacitor C11. , And a twelfth control capacitor (C12) is disposed at the output side of the three-phase interleaved solar converter A three-phase interleaved solar converter comprising:
A solar cell 100 that receives solar light to generate electricity;
First to third converters 31 to 33 that receive a voltage generated from the solar cell 100 and convert the power;
First to third inductors 41 to 43 connected to upper and lower switches of the first to third converters 31 to 33, respectively;
First to third current sensors 51 to 53 for detecting the first to third output currents io1 to io3 of the first to third converters 31 to 33;
First to third current comparators 221 to 223 of a current controller 220 for comparing the first to third output currents io1 to io3 with a reference current value iref;
First and second voltage detecting resistors (54, 55) for detecting an output voltage (Vo) of the three-phase interleaved solar converter;
A voltage controller 210 for comparing the output voltage Vo with a reference voltage Vref1 and outputting a control voltage Vc;
A first control comparator 241 for comparing an output of the first current comparator 221 with a control voltage Vc of the voltage controller 210;
A third control comparator 243 for comparing the output of the second current comparator 222 with the control voltage Vc of the voltage controller 210;
A fifth control comparator 245 for comparing the output of the third current comparator 223 with the control voltage Vc of the voltage controller 210;
A shared voltage bus line (Share Bus) 307 sharing the first to third output currents io1 to io3 from the first to third current sensors 51 to 53;
A parallel operation current monitor unit 303 for outputting the first parallel operation control voltage Vc1 of the specific converter through the specific current sensor among the first to third current sensors 51 to 53;
A parallel operation diode 305 disposed between the shared voltage bus line 307 and the parallel operation current monitor unit 303;
A three-phase interleaved solar converter 309 comprising a parallel operating resistor 304 and an N-type transistor 311 arranged in parallel with the parallel operating diode 305, 11. The method of claim 10,
The output of the first to third control OR gates 247 to 249 and the first to third oscillator pulses PH1 to PH3 of the gate signal generator 240 are input to the switches of the three- And an RS flip-flop (260) for generating a gate signal to turn on or off the output of the three-phase interleaved solar converter 11. The method of claim 10,
The first to third converters 31 to 33 operate in an average current mode at a heavy load and operate in a maximum current mode at a light load. Converter

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