CN110601575A - Grid-connected inverter - Google Patents

Grid-connected inverter Download PDF

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Publication number
CN110601575A
CN110601575A CN201910992238.XA CN201910992238A CN110601575A CN 110601575 A CN110601575 A CN 110601575A CN 201910992238 A CN201910992238 A CN 201910992238A CN 110601575 A CN110601575 A CN 110601575A
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CN
China
Prior art keywords
resistor
pin
capacitor
cathode
respectively connected
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Application number
CN201910992238.XA
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Chinese (zh)
Inventor
赵音
靳龙飞
王胜强
苏秋菊
康微微
姜璐
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Liaoning Solar Energy R & D Co Ltd
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Liaoning Solar Energy R & D Co Ltd
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Priority to CN201910992238.XA priority Critical patent/CN110601575A/en
Publication of CN110601575A publication Critical patent/CN110601575A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

A grid-connected inverter belongs to the technical field of inverters, and particularly relates to a grid-connected inverter. The invention provides a grid-connected inverter with good use effect. The photovoltaic current and current direction acquisition circuit comprises a CPU circuit, a power supply part, a drive circuit, a main circuit, a photovoltaic current and current direction acquisition part, a storage battery voltage acquisition part connected to the input end of the main circuit, a commercial power current acquisition part, a commercial power voltage acquisition part and a commercial power phase demodulation circuit.

Description

Grid-connected inverter
Technical Field
The invention belongs to the technical field of inverters, and particularly relates to a grid-connected inverter.
Background
A device having an inverter function is required to transmit low-voltage and direct-current power of a photovoltaic power generation system to a distribution line with a high voltage class. The use effect of the existing inverter needs to be further improved.
Disclosure of Invention
The invention aims at the problems and provides a grid-connected inverter with good use effect.
In order to achieve the purpose, the invention adopts the following technical scheme that the photovoltaic current and current direction acquisition circuit comprises a CPU circuit, a power supply part, a driving circuit, a main circuit, a photovoltaic current and current direction acquisition part, a storage battery voltage acquisition part connected to the input end of the main circuit, a mains current acquisition part, a mains voltage acquisition part and a mains phase discrimination circuit, and is characterized in that an electric energy output port of the power supply part is respectively connected with an electric energy input port of the CPU circuit, an electric energy input port of the driving circuit, an electric energy input port of the photovoltaic current and current direction acquisition part, an electric energy input port of the storage battery voltage acquisition part and an electric energy input port of the mains current acquisition part, a detection signal input port of the CPU circuit is respectively connected with a detection signal output port of the photovoltaic current and current direction acquisition, The detection signal output port of the commercial power current acquisition part, the detection signal output port of the commercial power voltage acquisition part and the detection signal output port of the commercial power phase discrimination circuit are connected;
the control signal output port of the CPU circuit is connected with the control signal input port of the driving circuit, and the control signal output port of the driving circuit is connected with the control signal input port of the main circuit.
As a preferred scheme, the invention also comprises an LED indicating part, and a control signal input port of the LED indicating part is connected with a control signal output port of the CPU circuit.
As another preferred scheme, the invention also comprises an RS485 communication part, wherein an electric energy input port of the RS485 communication part is connected with an electric energy output port of the power supply part, and a communication signal input port of the RS485 communication part is connected with a communication signal output port of the CPU circuit.
As another preferable scheme, the invention further comprises an anti-reverse charging circuit of the main circuit, wherein a control signal input port of the anti-reverse charging circuit is connected with a control signal output port of the CPU circuit.
As another preferred scheme, the CPU circuit of the invention adopts an STM32F407ZET chip U, wherein 34-37 pins of the U are respectively correspondingly connected with ADC-ADC ends, 40-43 pins of the U are respectively correspondingly connected with PA-PA ends, 100-104 pins of the U are respectively correspondingly connected with PA-PA ends, 105 and 109 pins of the U are respectively correspondingly connected with TMS and TCK ends, 110 pins of the U are respectively connected with PA ends, 46 and 47 pins of the U are respectively correspondingly connected with L _Pends, 48 pins of the U are connected with BOOT ends, 133-137, 139 and 140 of the U are respectively correspondingly connected with PB-PB ends, 69 and 70 pins of the U are respectively correspondingly connected with PB and PB ends, 73-76 pins of the U are respectively correspondingly connected with PB-PB ends, 26-29 pins of the U are respectively correspondingly connected with PC-PC ends, 44 and 45 pins of the U are respectively correspondingly connected with PC ends and PC ends, 96-99 pins of the U are respectively correspondingly connected with PC-PC ends, and 111-PC ends, a pin 7 of U3 is connected with a PC13 end, a pin 8 of U3 is respectively connected with a pin 2 of a crystal oscillator Y1 and one end of a capacitor C22, the other end of C22 is respectively connected with a ground wire and one end of a capacitor C23, and the other end of C23 is respectively connected with a pin 1 of Y1 and a pin 9 of U3;
pins 114-119 of U3 are correspondingly connected with ends PD 0-PD 5 respectively, pins 122 and 123 of U3 are correspondingly connected with ends PD6 and PD7 respectively, pins 77-82 of U3 are correspondingly connected with ends PD 8-PD 13 respectively, pins 85 and 86 of U3 are correspondingly connected with ends PD14 and PD15 respectively, and pin 138 of U3 is connected with end BOOT 0;
pins 16, 38, 51, 61, 83, 94, 107, 120, 130 of U3 are grounded;
pins 30, 17, 52, 39, 62, 72, 84, 95, 108, 121, 131, 144 of U3 are grounded;
a pin 143 of the U3 is respectively connected with a ground wire, one end of a capacitor C44, one end of a capacitor C43 and a pin 31 of the U3 through a resistor R85, the other end of the C43 is respectively connected with a pin 33 of the U3, the other end of the capacitor C44 and one end of a resistor R84, and the other end of the R84 is connected with a +3.3V end;
a pin 106 of the U3 is respectively connected with one end of a capacitor C28, one end of a capacitor C26 and the ground wire through a capacitor C29, the other end of the C28 is connected with a pin 71 of the U3, and the other end of the C26 is connected with a pin 32 of the U3;
the 6 pins of the U3 are connected with a VBAT end;
a pin 25 of U3 is connected with a RESET end;
a pin 24 of the U3 is respectively connected with one end of a capacitor C24 and a pin 2 of a crystal oscillator Y2, and the other end of the C24 is respectively connected with a pin 1 of Y2 and a pin 23 of the U3 through a capacitor C25;
the pin 132 of U3 is connected with the end PG15, the pins 124-129 of U3 are respectively correspondingly connected with the ends PG 9-PG 14, the pins 87-93 of U3 are respectively correspondingly connected with the ends PG 2-PG 8, and the pins 56 and 57 of U3 are respectively correspondingly connected with the ends PG0 and PG 1;
53-55 feet of U3 are correspondingly connected with PF 13-PF 15 ends respectively, 49 and 50 feet of U3 are correspondingly connected with PF11 and PF12 ends respectively, 18-21 feet of U3 are correspondingly connected with PF 6-PF 9 ends respectively, and 10-15 feet of U3 are correspondingly connected with PF 0-PF 5 ends respectively;
the pins 63-68 of U3 are correspondingly connected with the ends of PE 10-PE 15 respectively, the pins 58-60 of U3 are correspondingly connected with the ends of PE 7-PE 9 respectively, the pins 1-5 of U3 are correspondingly connected with the ends of PE 2-PE 6 respectively, and the pins 141 and 142 of U3 are correspondingly connected with the ends of PE0 and PE1 respectively.
As another preferred scheme, the +3.3V end of the invention is respectively connected with the anode of a capacitor C56 and one end of C57-C67, and the cathode of C56 and the other end of C57-C67 are grounded;
the VBAT end is respectively connected with one end of a capacitor C53, the cathode of a diode D24 and the cathode of a diode D25, the other end of the C53 is connected with a GND end, the anode of the D24 is connected with a +3.3V end, and the anode of the D25 is connected with a BAT end;
the +3.3V end is respectively connected with the RESET end, one end of a switch SW1 and one end of a capacitor C51 through R90, and the other end of the C51 is respectively connected with the GND end and the other end of the SW 1;
a pin 1 of a plug connector P50 is respectively connected with a +3.3V end and one end of a capacitor C52, the other end of C52 is connected with a pin 4 of P50, pins 2 and 3 of P50 are respectively connected with a TMS end and a TCK end, and pins 1-4 of a plug connector P51 are respectively correspondingly connected with a +5V end, a PA10 end, a PA9 end and a GND end; pin 1 of plug connector P49 is connected with +3.3V terminal and pin 2 of P49 respectively, pin 3 of P49 is connected with BOOT0 terminal through resistor R88, pin 5 of P49 is connected with ground wire and pin 6 of P49 respectively, and pin 4 of P49 is connected with BOOT1 terminal through resistor R89.
In another preferred scheme, the capacitor C56 is 470uF6.3V, the capacitors C57-C67 are 0.1uF, the capacitor C53 is 0.1uF, the diodes D24 and D25 are 1N4148, the resistor R90 is 10K, the capacitors C51 and C52 are 0.1uF, and the resistors R88 and R89 are 10K.
In another preferred embodiment, Y1 is a 32.768KHz crystal oscillator, C22 and C23 are 10pF capacitors, R85 and R84 are 1K resistors, C44 and C43 are 2.2uF capacitors, C29, C28 and C26 are 2.2uF capacitors, Y2 is an 8MHz crystal oscillator, and C24 and C25 are 20pF capacitors.
As another preferred scheme, the power supply part of the invention comprises an LM2576-5.0 chip U8, an AMS1117-3.3 chip U9 and an AC/DC module, wherein one end of an input end of the AC/DC module is respectively connected with one end of a capacitor C31 and 2 pins of an UU9.8 inductor L1, one pin 1 of the L1 is respectively connected with one end of a capacitor C27, one end of a resistor R56 and one end of a fuse F1, and the other end of the F1 is connected with a P55;
the other end of the C31 is respectively connected with the other end of the input end of the AC/DC module and the 4 pin of the L1, the 3 pin of the L1 is respectively connected with the other end of the C27, the other end of the R56 and one end of the inductor L2, the other end of the L2 is connected with the P56 end, the positive pole of the output end of the AC/DC module is respectively connected with the positive pole of the capacitor C69, one end of the capacitor C70 and the +15V end, and the negative pole of the output end of the AC/DC module is respectively connected with the negative pole of the;
a pin 1 of U8 is respectively connected with a +15V end, one end of a capacitor C74 and the anode of a capacitor C75, and the other end of C74 is respectively connected with the cathode of C75, the pin 5 of U8, the pin 3 of U8, the anode of a diode D29, the cathode of the capacitor C76, one end of a capacitor C77 and the ground wire; the cathode of the D29 is respectively connected with the 2 pin of the U8 and one end of an inductor L3, and the other end of the L3 is respectively connected with the 4 pin of the U8, the anode of the C76, the other end of the C77 and the +5V end;
the 3 feet of U9 are connected with +5V end, one end of capacitor C81 and positive pole of capacitor C79, the other end of C81 is connected with negative pole of C79, 1 foot of U9, one end of capacitor C80, negative pole of capacitor C78 and ground wire, the other end of C80 is connected with 2 feet of U9, 4 feet of U9, positive pole of capacitor C78 and +3.3V end.
As another preferred scheme, the F1 is a AC250V3.5A fuse, the L2 is a 2H inductor, the R56 is a 10K resistor, the C27 is a 0.1uF capacitor, the C31 is a 0.1uF capacitor, the C69 is a 100uF/35V capacitor, and the C70 is a 0.1uF/16V capacitor;
c74 is a 0.1uF/25V capacitor, C75 is a 470uF/25V capacitor, D29 is an SS34 diode, L3 is a 100uH inductor, C76 is a 470uF6.3V capacitor, and C77 is a 0.1uF/10V capacitor;
c81 is 0.1uF capacitance, C79 is 47uF/6.3V capacitance, C80 is 0.1uF/10V capacitance, and C78 is 47uF/6.3V capacitance.
As another preferred scheme, in the driving circuit of the invention, the driving circuit 2SD315AI chips U4 and 2SD315AI chips U5 and KP101 chip U6, the 1 pin and the 2 pin of U4 are connected to +15V ends, the 3 pin of U4 is connected to PA4 end through a resistor R49, the 4 pin of U4 is connected to one end of a resistor R51 and one end of a resistor R53 respectively, the other end of R51 is connected to +15V ends, the other end of R51 is grounded, the 5 pin of U51 is grounded, the 6 pin of U51 is connected to one end of a resistor R51 and one end of a capacitor C51 respectively, the other end of R51 is connected to the anode of a diode D51, the cathode of the diode D51 and one end of a resistor R51, the cathode of the D51 is connected to +15V ends, the other end of the R51 is connected to the PA 51 and one end of the resistor R51, and the other end of;
the pin 7 of U4 is grounded, the pin 8 of U4 is connected with the +15V end, and the pin 9 of U4 is connected with the PA7 end through a resistor R64;
a pin 10 of U4 is respectively connected with one end of a resistor R69 and one end of a capacitor C20, the other end of R69 is respectively connected with the anode of a diode D16, the cathode of a diode D18 and one end of a resistor R68, the cathode of D16 is connected with a +15V end, the other end of R68 is respectively connected with the end of PA6 and one end of a resistor R74, and the other end of R74 is respectively connected with the anode of D18, the ground wire and the other end of C20;
pins 11 and 12 of U4 are grounded;
pins 13-17 of U4 are connected with a +15V end;
pins 18-22 of U4 are grounded;
the pin 23 of U4 connects the cathode of LED E8, the anode of E8 connects VC2 end through the resistance R93;
the pin 24 of the U4 is respectively connected with one end of a resistor R91 and one end of a capacitor C54, the other end of the C54 is grounded, the other end of the R91 is connected with the anode of a diode D26, and the cathode of the D26 is connected with the end P52;
the pin 25 of U4 is connected with the pin 26 of U4, the pin 27 of U4 and the end P47 through a resistor R86;
a pin 28 of the U4 is respectively connected with one end of a capacitor C45, one end of C46, one end of C47 and the end of VC2, and the other end of C45, the other end of C46 and the other end of C47 are grounded;
pins 29 and 30 of U4 are grounded;
a pin 31 of U4 is respectively connected with a pin 32 of U4, one end of a resistor R80, one end of a resistor R76 and the anode of a diode D20, the cathode of D20 is respectively connected with the other end of R76, the other end of R80, one end of the resistor R78 and one end of a resistor R81, and the other end of R81 is respectively connected with the other end of R78 and the end of P45;
the pin 35 of the U4 is connected with the cathode of a light-emitting diode E6, and the anode of E6 is connected with the end VC1 through a resistor R72;
the pin 36 of the U4 is respectively connected with one end of a resistor R66 and one end of a capacitor C18, the other end of the C18 is grounded, the other end of the R66 is connected with the anode of a diode D14, and the cathode of the D14 is connected with the end P43;
the pin 37 of the U4 is respectively connected with the pin 38 of the U4, the pin 39 of the U4 and the P41 end through a resistor R62;
a pin 40 of the U4 is respectively connected with one end of a capacitor C10, one end of a capacitor C11, one end of a capacitor C12 and the end of VC1, and the other end of C10, the other end of C11 and the other end of C12 are grounded;
pins 41 and 42 of U4 are grounded;
a pin 43 of U4 is respectively connected with a pin 44 of U4, one end of a resistor R41, the anode of a diode D8 and one end of a resistor R45, the cathode of D8 is respectively connected with the other end of R41, the other end of R45, one end of a resistor R43 and one end of a resistor R46, and the other end of R46 is respectively connected with the other end of R43 and the end of P37;
a pin 1 and a pin 2 of a U5 are connected with a +15V end, a pin 3 of the U5 is connected with a PD10 end through a resistor R50, a pin 4 of a U5 is respectively connected with one end of a resistor R52 and one end of a resistor R54, the other end of the R52 is connected with the +15V end, the other end of the R54 is grounded, a pin 5 of the U5 is grounded, a pin 6 of the U5 is respectively connected with one end of a resistor R59 and one end of a capacitor C17, the other end of the R59 is respectively connected with an anode of a diode D11, a cathode of a diode D13 and one end of a resistor R58, a cathode of the D11 is connected with the +15V end, the other end of the R58 is respectively connected with a PD11 end and one end of a resistor;
the pin 7 of U5 is grounded, the pin 8 of U5 is connected with the +15V end, and the pin 9 of U5 is connected with the PD13 end through a resistor R65;
a pin 10 of U5 is respectively connected with one end of a resistor R71 and one end of a capacitor C21, the other end of R71 is respectively connected with the anode of a diode D17, the cathode of a diode D19 and one end of a resistor R70, the cathode of D17 is connected with a +15V end, the other end of R70 is respectively connected with the PD12 end and one end of a resistor R75, and the other end of R75 is respectively connected with the anode of D19, the ground wire and the other end of C21;
pins 11 and 12 of U5 are grounded;
pins 13-17 of U5 are connected with a +15V end;
pins 18-22 of U5 are grounded;
the pin 23 of U5 connects the cathode of LED E9, the anode of E9 connects VC2 end through the resistance R94;
the pin 24 of the U5 is respectively connected with one end of a resistor R92 and one end of a capacitor C55, the other end of the C55 is grounded, the other end of the R92 is connected with the anode of a diode D27, and the cathode of the D27 is connected with the end P53;
the pin 25 of U5 is connected with the pin 26 of U5, the pin 27 of U5 and the end P48 through a resistor R87;
a pin 28 of the U5 is respectively connected with one end of a capacitor C48, one end of C49, one end of C50 and the end of VC2, and the other end of C48, the other end of C49 and the other end of C50 are grounded;
pins 29 and 30 of U5 are grounded;
a pin 31 of U5 is respectively connected with a pin 32 of U5, one end of a resistor R82, one end of a resistor R77 and the anode of a diode D21, the cathode of D21 is respectively connected with the other end of R77, the other end of R82, one end of the resistor R79 and one end of a resistor R83, and the other end of R83 is respectively connected with the other end of R79 and the end of P46;
the pin 35 of the U5 is connected with the cathode of a light-emitting diode E7, and the anode of E7 is connected with the end VC1 through a resistor R73;
the pin 36 of the U5 is respectively connected with one end of a resistor R67 and one end of a capacitor C19, the other end of the C19 is grounded, the other end of the R67 is connected with the anode of a diode D15, and the cathode of the D15 is connected with the end P44;
the pin 37 of the U5 is respectively connected with the pin 38 of the U5, the pin 39 of the U5 and the P42 end through a resistor R63;
a pin 40 of the U5 is respectively connected with one end of a capacitor C13, one end of a capacitor C14, one end of a capacitor C15 and the end of VC1, and the other end of C13, the other end of C14 and the other end of C15 are grounded;
pins 41 and 42 of U5 are grounded;
a pin 43 of U5 is respectively connected with a pin 44 of U5, one end of a resistor R42, the anode of a diode D9 and one end of a resistor R47, the cathode of D9 is respectively connected with the other end of R42, the other end of R47, one end of a resistor R44 and one end of a resistor R48, and the other end of R48 is respectively connected with the other end of R44 and the end of P38;
a pin 2 of U6 is respectively connected with one end of a resistor R95 and one end of a capacitor C68, the other end of C68 is respectively connected with a PA8 end and the other end of R95, a pin 3 of U6 is connected with a GND end, a pin 4 of U6 is respectively connected with a +15V end, one end of a capacitor C71 end and the anode of a capacitor C72, and a pin 5 of U6 is respectively connected with the GND end, the other end of C71 and the cathode of the capacitor C72;
the pin 18 of the U6 is respectively connected with one end of a resistor R101, one end of a capacitor C73 and the pin 1 of the TL521 chip U7 through a resistor R100, and the pin 2 of the U7 is respectively connected with the other end of the R101, the other end of the C73 and an OP-end; the 4 pins of U7 are connected with the +3.3V end, and the 3 pins of U7 are connected with the PA7 end;
a pin 17 of U6 is respectively connected with one end of a resistor R99 and one end of QE5, the other end of R99 is respectively connected with a QG5 end, one end of a resistor R97 and one end of a resistor R98, the other end of R98 is connected with a pin 16 of U6, the other end of R97 is connected with a pin 15 of U6, and a pin 13 of U6 is connected with an OP end;
the 12 feet of U6 are connected with the cathode of zener diode ZD14 and one end of resistor R96 respectively, the anode of ZD14 is connected with the 11 feet of U6, the other end of R96 is connected with the cathode of zener diode ZD15, the anode of ZD15 is connected with the anode of diode D28, and the cathode of D28 is connected with the end of QC 5.
In another preferred embodiment, in the present invention, R49 is a 4.7K resistor, R51 is a 10K resistor, R53 is a 10K resistor, R57 is a 1.2K resistor, R57 is a 150R resistor, C57 is a 1nF capacitor, R57 is a 4.7K resistor, R57 is a 1.2K resistor, R57 is a 150R resistor, R57 is a 4.7K resistor, C57 is a 1nF capacitor, R57 is a 3.3K resistor, C57 is a 152 capacitor, R57 is a 180R resistor, R57 is a 47K resistor, C57 are respectively 0.1uF/25V/T, 100uF/25V/D, R57, R byf 72 are respectively 2.7R, R57D, C57 is a 100 uF/25V/T, C57 is a 3V/D, C57 is a 3V/25V/D, C57 is a3 g/C57, C57 is a 3V/C57 is a C57, R57 is a C57, C57 is a C, r41, R43, R45 and R46 are 2.7R resistors, and D8 is a BYV26E diode;
r is a 4.7K resistor, R is a 10K resistor, R is a 150R resistor, R is a 1.2K resistor, R is a 4.7K resistor, C is a 1nF capacitor, R is a 4.7K resistor, R is a 150R resistor, R is a 4.7K resistor, R is a 1.2K resistor, C is a 1nF capacitor, R is a 3.3K resistor, C is a 152 resistor, R is a 180R resistor, R is a 47K resistor, C are 0.1uF/25V/T, 100uF/25V/D capacitors, R are 2.7R resistors, D is a BYV26 diode, R is a 3.3K resistor, C is a 152 capacitor, R is a 180R resistor, R is a 47K resistor, C are 0.1uF/25V/T, 100F/25V/D, 100 uV/D, 100 uR, 2.25R, 2 uV/D, R and R are 2.7 nF/R resistors, d9 is a BYV26E diode;
r95 is 470R resistance, C68 is 20pF capacitance, C71 is 0.1uF capacitance, C72 is 100uF25V capacitance, R100 is 1K resistance, R101 is 4.7K resistance, C73 is 20pF capacitance, R99 is 10K resistance, R98 and R97 are 47R resistance, R96 is 470R resistance, ZD15 is 1N4733 diode, D28 is HER107 diode, ZD14 is 1N4746 diode.
As another preferable scheme, the +15V terminal of the invention is respectively connected to a cathode of a zener diode D22, one terminal of a capacitor C37, one terminal of a capacitor C38, one terminal of a capacitor C39, an anode of a capacitor C30, an anode of a capacitor C32, and an anode of a capacitor C33, and the anode of a capacitor D22 is respectively connected to a ground line, the other terminal of a capacitor C37, the other terminal of a capacitor C38, the other terminal of a capacitor C39, an anode of a capacitor C30, a cathode of a capacitor C32, and a cathode of a capacitor C33;
the +15V end is respectively connected with a cathode of a voltage stabilizing diode D23, one end of a capacitor C40, one end of a capacitor C41, one end of a capacitor C42, an anode of a capacitor C34, an anode of a capacitor C35 and an anode of a capacitor C36, and an anode of the capacitor D23 is respectively connected with a ground wire, the other end of the capacitor C40, the other end of the capacitor C41, the other end of the capacitor C42, an anode of a capacitor C34, a cathode of the capacitor C35 and a cathode of a capacitor C36.
As another preferred scheme, the D22 is a 1N4746 diode, the C37 is a 0.1uF/25V/T capacitor, the C38 and the C39 are 100uF/25V/D capacitors, and the C30, the C32 and the C33 are 220uF/25V/GT capacitors;
d23 is a 1N4746 diode, C40 is a 0.1uF/25V/T capacitor, C41 and C42 are 100uF/25V/D capacitors, and C34, C35 and C36 are 220uF/25V/GT capacitors.
As another preferable scheme, the main circuit of the invention comprises a tube Q1 of FF300R12KS4, a tube Q2 of FF300R12KS4, an N-IGBT, a tube Q3 of FF300R12KS4 and a tube Q4 of FF300R12KS4, a pin 2 of Q1 is respectively connected with a cathode of a diode, a QC5 end, one end of a normally open switch of a relay K1 and one end of a switch K2, the other end of the normally open switch of the relay K1 is connected with a PV end, the other end of K2 is respectively connected with a BT + end and an anode of a battery BT1, a pin 1 of Q1 is respectively connected with one end of a resistor R5, a cathode of a regulator tube ZD1, and an end of a QG1, the other end of R1 is respectively connected with a cathode of a regulator tube ZD1 and a QE1, an anode of a1 of a capacitor C1 is connected with an anode of a diode, a Q1 end, a cathode of a ZD1 and a cathode of a ZD1 are respectively connected with a cathode of a regulator tube ZD1, a cathode of a diode, a Q1, a cathode of a ZD1 and a cathode of a ZD1, a ZD1 are respectively connected with a cathode of a Q1, a diode, a, The power supply comprises a QC2 end, one end of a capacitor C7, one end of the primary side of a transformer T1 and an IGBT collector, wherein an IGBT gate is respectively connected with a QG2 end, a voltage-regulator tube ZD8 cathode and one end of a resistor R33, an anode of ZD8 is connected with an anode of a voltage-regulator tube ZD11, a cathode of ZD11 is respectively connected with a QE2 end, the other end of a resistor R33 end, an IGBT emitter, one end of IP1A, a BT-end, a BT1 cathode, a QE4 end, a pin 3 of Q6, one end of a resistor R34, a cathode of a voltage-regulator tube ZD12, the other end of C5 and;
a pin 1 of Q3 is respectively connected with a QG3 end, a cathode of a voltage regulator tube ZD4 and one end of a resistor R16, an anode of ZD4 is connected with an anode of a voltage regulator tube ZD6, a cathode of ZD6 is respectively connected with a QE3 end, the other end of R16, a pin 3 of Q3, a QC4 end, one end of a resistor R23, one end of a resistor R26, one end of a resistor R29, a pin 2 of Q6 and the other end of the primary side of a transformer T1, a pin 1 of Q6 is respectively connected with a QG4 end, a cathode of the voltage regulator tube ZD9 and the other end of the resistor R34;
the other end of the C7 is respectively connected with one end of a resistor R22, one end of a resistor R25 and one end of a resistor R28, the other end of the R22 is connected with the other end of the R23, the other end of the R25 is connected with the other end of the R26, and the other end of the R28 is connected with the other end of the R29;
one end of a secondary side of T1 is respectively connected with one end of a capacitor C4 and one end of an inductor LD2 through an inductor LD1, the other end of C4 is respectively connected with the other end of the secondary side of T1 and one end of IP2A, the other end of the Hall current sensor IP2A is connected with a P20 end, and the other end of LD2 is connected with a P16 end.
As another preferred embodiment, BT1 is a 1200V10AH battery, R5 is a 10K resistor, ZD1 and ZD1 are 1N4746 diodes, R1 is a 10K resistor, R1, and R1 are 100R resistors, C1 is 1200V/0.47uF capacitor, ZD1 and ZD1 are 1N4746 diodes, R1 is a 10K resistor, C1 and C1 are 1200V470 1 capacitors, LD1 is 3P384 ul h, and v2272 is 1200 u h capacitor.
As another preferred scheme, the photovoltaic current and current direction collecting part comprises an HB-PS3.3 chip IP1B, wherein a pin 1 of the IP1B is respectively connected with an ADC0 end and one end of a resistor R2 through a resistor R1, the other end of the R2 is respectively connected with a pin 4 of the IP1B, a ground wire and a pin 3 of the IP1B, a pin 2 of the IP1B is connected with a +5V end, the +5V end is respectively connected with a positive electrode of a capacitor C1 and one end of a capacitor C2, and a negative electrode of the capacitor C1 is respectively connected with the other end of the capacitor C2 and a GND end.
In another preferred scheme, R1 and R2 are resistors of 10K, C1 is a capacitor of 100uF/10V, and C2 is a capacitor of 0.1 uF.
As another preferred scheme, the storage battery voltage acquisition part comprises a chip, wherein the HIN + end of the chip is connected with the BT + end through a resistor R8, the HIN-end of the chip is connected with the BT-end through a resistor R12, the VCC end of the chip is connected with the +5V end, the GND end of the chip is grounded, the M end of the chip is respectively connected with one end of a resistor R18 and one end of an ADC1 through a resistor R11, and the other end of the R18 is connected with the GND end.
As another preferred scheme, the resistors R8 and R12 adopt 47K resistors, and the resistors R11 and R18 adopt 10K resistors.
As another preferable scheme, the utility current collecting part of the present invention includes a chip IP2B, pin 1 of IP2B is connected to the ADC2 terminal and one end of a resistor R30 through a resistor R27, the other end of the resistor R30 is connected to pin 4 of IP2B, pin 3 of IP2B, and ground, pin 2 of IP2B is connected to +5V terminal, the +5V terminal is connected to the positive electrode of a capacitor C8 and one end of a capacitor C9, and the negative electrode of C8 is connected to the other end of C9 and GND terminal.
As another preferred scheme, the resistors R27 and R30 adopt 10K resistors, the capacitor C8 adopts 100uF/10V, and the capacitor C9 adopts 0.1 uF.
As another preferred scheme, the utility voltage acquisition part of the present invention comprises a utility voltage acquisition transformer, one primary side of the utility voltage acquisition transformer is connected with a P28 end, and the other primary side of the utility voltage acquisition transformer is connected with a P31 end;
one end of a secondary side of the mains voltage acquisition transformer is connected with a cathode of a diode D4 and an anode of a diode D5 respectively, an anode of a diode D4 is connected with an anode of a diode D7, one end of a resistor R39, one end of a resistor R40, an anode of a voltage regulator tube ZD13 and a GND end respectively, a cathode of a diode D7 is connected with the other end of the secondary side of the mains voltage acquisition transformer and an anode of a diode D6 respectively, a cathode of a D6 is connected with a cathode of a D5, the other end of the R39, one end of a resistor R37 and an ADC3 respectively, and the other end of R37.
As another preferred scheme, the primary side of the mains voltage acquisition transformer is 100 turns, and the secondary side is 10 turns; r39 is 47R resistor, R37 is 19K resistor, R40 is 1K resistor, and ZD13 is 3.3V voltage regulator tube.
As another preferred scheme, the phase detection circuit of the present invention includes a phase detection circuit transformer and an LM358D chip U1, wherein one end of the primary side of the phase detection circuit transformer is connected to one end of a capacitor C3 and one end of a resistor R4, respectively, the other end of the primary side of the phase detection circuit transformer is connected to the L-terminal of the utility power through R3, the other end of the primary side of the phase detection circuit transformer is connected to the other end of a capacitor C3 and one end of a resistor R7, respectively, and the other end of the R7 is connected to the;
one end of a first secondary side of the phase discrimination circuit transformer is connected with the anode of a diode D1, the cathode of a D1 is connected with an L _ X end, the other end of the first secondary side of the phase discrimination circuit transformer is respectively connected with a GND end and one end of a second secondary side of the phase discrimination circuit transformer, the other end of the second secondary side of the phase discrimination circuit transformer is connected with the anode of a diode D3, and the cathode of a D3 is connected with an N _ X end;
a pin 2 of U1 is connected with a GND end, a pin 3 of U1 is respectively connected with an L _ X end and one end of a resistor R24, the other end of R24 is respectively connected with the GND end, a pin 4 of U1 and an anode of a voltage regulator tube ZD7, a cathode of ZD7 is respectively connected with one end of a resistor R21 and the L _ P end, the other end of R21 is connected with a pin 1 of U1, and a pin 8 of U1 is connected with a +15V end;
the 6 pin of U1 connects GND end, the 5 pin of U1 connects N _ X end, resistance R36 one end separately, the other end of R36 connects GND end, 4 pin of U1, anode of voltage regulator ZD10 separately, ZD10 cathode connects resistance R32 one end, N _ P end separately, another end of R32 connects 7 pin of U1.
In another preferred scheme, R3, R4, R6 and R7 are resistors of 47K, C3 is a capacitor of 0.1uF, the primary side of a transformer of the phase detection circuit is 220 turns, the first secondary side and the second secondary side of the transformer of the phase detection circuit are 5 turns, D1 and D3 are HER107 diodes, R24 and R36 are resistors of 10K, R21 and R32 are resistors of 4.7K, and ZD7 and ZD10 are voltage stabilizing diodes of 3.3V.
As another preferable scheme, the LED indication part of the present invention includes resistors R9, R10, R13, R17, R20, one end of R9 is connected to a PB2 end, the other end of R9 is connected to an anode of a light emitting diode E1, a cathode of E1 is connected to a GND end, one end of R1 is connected to a PB1 end, the other end of R1 is connected to an anode of a light emitting diode E1, a cathode of E1 is connected to a GND end, the other end of R1 is connected to an anode of a light emitting diode E1, the other end of R1 is connected to a cathode of a light emitting diode E1, the one end of R1 is connected to a PB1 end, the other end of R1 is connected to an anode of a light emitting diode E1, and the cathode of E1 is connected to a GND end.
In another preferred embodiment, the resistors R9, R10, R13, R17 and R20 adopt 1K resistors.
As another preferred scheme, the RS485 communication portion of the present invention employs an SP3485 chip U2, a pin 1 of U2 is connected to a PA10 terminal, pins 2 and 3 of U2 are connected to a PA11 terminal, a pin 4 of U2 is connected to a PA9 terminal, a pin 5 of U2 is connected to a GND terminal, a pin 6 of U2 is connected to an RS485_ a terminal and one end of a resistor R38, the other end of R38 is connected to a +3.3V terminal, a pin 7 of U2 is connected to one end of a resistor R35 and one end of an RS485_ B terminal, the other end of R35 is connected to a GND terminal, a pin 8 of U2 is connected to a +3.3V terminal, an end of RS485_ a is connected to an end of RS485_ B terminal through a resistor R8, an end of RS485_ a is connected to a GND terminal through a TVS tube Z1, an end of RS485_ B terminal is connected to a GND terminal through a TVS tube Z2, an end of RS485_ a terminal is connected to a terminal through TVS tube Z3, and a terminal, a terminal P29, a pin 1, a terminal, a pin 2.
In another preferred scheme, R31 is 120R resistance, R35 and R38 are 470R resistance, and Z1, Z2 and Z3 are SMBJ5.0CA tubes.
As another preferable scheme, the anti-reverse charging circuit comprises an NPN triode Q4, a collector of Q4 is respectively connected with one end of a control end of a relay K1 and an anode of a diode D2, a cathode of D2 is respectively connected with a +15V end and the other end of a control end of K1, a base of Q4 is respectively connected with one end of a resistor R14 and one end of a resistor R19, the other end of R14 is connected with a PB7 end, and the other end of R19 is respectively connected with a GND end and an emitter of Q4.
Secondly, the D2 adopts an M7 diode, the R14 adopts a 470R resistor, the R19 adopts a 10K resistor, and the Q4 adopts an S8050 diode.
In addition, the ratio of the voltage at two ends of a single IGBT and the voltage at two ends of an energy storage system is expanded by Fourier series, namely:
when n is 1, 3, 5, …, the reason is that
A＝cos(nθc1)+cos(nθc2)+…+cos(nθcN)
B＝sin(nθc1)+sin(nθc2)+…+sin(nθcN)
U is the voltage across the energy storage system, EdA 2 voltage across the single IGBT, an，bnIs coefficient of trigonometric function of Fourier expansion, omega1Is the angular velocity;
when N is less than 2N, the output side is power frequency wave, so that higher harmonic wave can not exist, and the output waveform can be obviously improved after N-time cascade connection is adopted.
The invention has the beneficial effects.
The invention can carry out high-efficiency and reliable photovoltaic grid-connected inversion through the mutual matching of all parts.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
Fig. 1 and 2 are schematic diagrams of main circuit circuits of the present invention.
Fig. 3 is a schematic circuit diagram of a photovoltaic current and current direction collecting part of the photovoltaic current and current direction collecting circuit.
FIG. 4 is a schematic diagram of a circuit of the battery voltage acquisition part of the present invention.
Fig. 5 is a schematic diagram of a circuit of a commercial power current collecting part of the invention.
Fig. 6 is a schematic diagram of a circuit of a mains voltage acquisition part of the invention.
Fig. 7 is a schematic diagram of a phase detection circuit of the present invention.
FIG. 8 is a schematic diagram of the LED indicating portion of the circuit of the present invention.
Fig. 9 is a schematic diagram of an anti-reverse charging circuit of the present invention.
FIG. 10 is a schematic diagram of the RS485 communication part of the circuit of the invention.
FIGS. 11 and 12 are schematic diagrams of the CPU circuit of the present invention.
Fig. 13 is a schematic circuit diagram of the power supply portion of the present invention.
Fig. 14, 15 and 16 are schematic diagrams of the driving circuit of the present invention.
Detailed Description
As shown in the figure, the invention comprises a CPU circuit, a power supply part, a drive circuit, a main circuit, a photovoltaic current and current direction acquisition part, a storage battery voltage acquisition part connected with the input end of the main circuit, a commercial power current acquisition part, a commercial power voltage acquisition part and a commercial power phase discrimination circuit, wherein the power output port of the power supply part is respectively connected with the power input port of the CPU circuit, the power input port of the drive circuit, the power input port of the photovoltaic current and current direction acquisition part, the power input port of the storage battery voltage acquisition part and the power input port of the commercial power current acquisition part, the detection signal input port of the CPU circuit is respectively connected with the detection signal output port of the photovoltaic current and current direction acquisition part, the detection signal output port of the storage battery voltage acquisition part, the detection signal output port of the commercial power current acquisition, The detection signal output port of the commercial power phase discrimination circuit is connected;
the control signal output port of the CPU circuit is connected with the control signal input port of the driving circuit, and the control signal output port of the driving circuit is connected with the control signal input port of the main circuit.
And comparing the storage battery voltage acquisition signal, the mains current acquisition signal, the mains voltage acquisition signal and the mains phase discrimination signal by using a comparator in the CPU, comparing the acquired data with a set threshold value, and detecting the working state.
The LED display device also comprises an LED indicating part, wherein a control signal input port of the LED indicating part is connected with a control signal output port of the CPU circuit.
The power supply also comprises an RS485 communication part, wherein an electric energy input port of the RS485 communication part is connected with an electric energy output port of the power supply part, and a communication signal input port of the RS485 communication part is connected with a communication signal output port of the CPU circuit.
The anti-reverse charging circuit of the main circuit is also included, and a control signal input port of the anti-reverse charging circuit is connected with a control signal output port of the CPU circuit.
The CPU circuit adopts an STM32F407ZET6 chip U3, the 34-37 feet of U3 are respectively correspondingly connected with an ADC 0-ADC 3 end, the 40-43 feet of U3 are respectively correspondingly connected with a PA 4-PA 7 end, the 100-104 feet of U3 are respectively correspondingly connected with a PA 8-PA 12 end, the 105 and 109 feet of U3 are respectively correspondingly connected with a TMS end and a TCK end, the 110 feet of U3 are respectively connected with a PA15 end, the 46 and 47 feet of U3 are respectively correspondingly connected with an L _ P, N _ P end, the 48 feet of U3 are respectively connected with a BOOT1 end, the 133-137, PB 139 and PB 140 of U1 are respectively correspondingly connected with a PB1 end, the 69 and PB1 end of U1 are respectively correspondingly connected with a PB1 end and a PB1 end, the 73-76 feet of U1 are respectively connected with a PB 72 end, the PC end is respectively connected with a PC1 end, the U1 end, the PC end is correspondingly connected with a PC 72 end, the U1 end, the PC end is respectively connected with a PC 72 and a PC end 1, the U1 end is correspondingly connected with a PC end 1 and a PC end, the U1 and a PC end is respectively connected with a PC end 1, the pin 8 of the U3 is respectively connected with the pin 2 of the crystal oscillator Y1 and one end of a capacitor C22, the other end of the C22 is respectively connected with a ground wire and one end of a capacitor C23, and the other end of the C23 is respectively connected with the pin 1 of the Y1 and the pin 9 of the U3;
pins 114-119 of U3 are correspondingly connected with ends PD 0-PD 5 respectively, pins 122 and 123 of U3 are correspondingly connected with ends PD6 and PD7 respectively, pins 77-82 of U3 are correspondingly connected with ends PD 8-PD 13 respectively, pins 85 and 86 of U3 are correspondingly connected with ends PD14 and PD15 respectively, and pin 138 of U3 is connected with end BOOT 0;
pins 16, 38, 51, 61, 83, 94, 107, 120, 130 of U3 are grounded;
pins 30, 17, 52, 39, 62, 72, 84, 95, 108, 121, 131, 144 of U3 are grounded;
a pin 143 of the U3 is respectively connected with a ground wire, one end of a capacitor C44, one end of a capacitor C43 and a pin 31 of the U3 through a resistor R85, the other end of the C43 is respectively connected with a pin 33 of the U3, the other end of the capacitor C44 and one end of a resistor R84, and the other end of the R84 is connected with a +3.3V end;
a pin 106 of the U3 is respectively connected with one end of a capacitor C28, one end of a capacitor C26 and the ground wire through a capacitor C29, the other end of the C28 is connected with a pin 71 of the U3, and the other end of the C26 is connected with a pin 32 of the U3;
the 6 pins of the U3 are connected with a VBAT end;
a pin 25 of U3 is connected with a RESET end;
a pin 24 of the U3 is respectively connected with one end of a capacitor C24 and a pin 2 of a crystal oscillator Y2, and the other end of the C24 is respectively connected with a pin 1 of Y2 and a pin 23 of the U3 through a capacitor C25;
the pin 132 of U3 is connected with the end PG15, the pins 124-129 of U3 are respectively correspondingly connected with the ends PG 9-PG 14, the pins 87-93 of U3 are respectively correspondingly connected with the ends PG 2-PG 8, and the pins 56 and 57 of U3 are respectively correspondingly connected with the ends PG0 and PG 1;
53-55 feet of U3 are correspondingly connected with PF 13-PF 15 ends respectively, 49 and 50 feet of U3 are correspondingly connected with PF11 and PF12 ends respectively, 18-21 feet of U3 are correspondingly connected with PF 6-PF 9 ends respectively, and 10-15 feet of U3 are correspondingly connected with PF 0-PF 5 ends respectively;
the pins 63-68 of U3 are correspondingly connected with the ends of PE 10-PE 15 respectively, the pins 58-60 of U3 are correspondingly connected with the ends of PE 7-PE 9 respectively, the pins 1-5 of U3 are correspondingly connected with the ends of PE 2-PE 6 respectively, and the pins 141 and 142 of U3 are correspondingly connected with the ends of PE0 and PE1 respectively.
The +3.3V end is respectively connected with the anode of a capacitor C56 and one end of C57-C67, and the cathode of C56 and the other end of C57-C67 are grounded;
the VBAT end is respectively connected with one end of a capacitor C53, the cathode of a diode D24 and the cathode of a diode D25, the other end of the C53 is connected with a GND end, the anode of the D24 is connected with a +3.3V end, and the anode of the D25 is connected with a BAT end;
the +3.3V end is respectively connected with the RESET end, one end of a switch SW1 and one end of a capacitor C51 through R90, and the other end of the C51 is respectively connected with the GND end and the other end of the SW 1;
a pin 1 of a plug connector P50 is respectively connected with a +3.3V end and one end of a capacitor C52, the other end of C52 is connected with a pin 4 of P50, pins 2 and 3 of P50 are respectively connected with a TMS end and a TCK end, and pins 1-4 of a plug connector P51 are respectively correspondingly connected with a +5V end, a PA10 end, a PA9 end and a GND end; pin 1 of plug connector P49 is connected with +3.3V terminal and pin 2 of P49 respectively, pin 3 of P49 is connected with BOOT0 terminal through resistor R88, pin 5 of P49 is connected with ground wire and pin 6 of P49 respectively, and pin 4 of P49 is connected with BOOT1 terminal through resistor R89.
P51 can print out TTL level and convert it into usb, and can display operation data on computer.
p50 is a program download port.
The CPU start-up mode can be selected through P49. The method can be started from a flash inside the cpu, and can also be started from an adram inside the cpu.
C56 is 470uF6.3V capacitance, C57-C67 are 0.1uF capacitance, C53 is 0.1uF capacitance, D24 and D25 are 1N4148 diodes, R90 is 10K resistance, C51 and C52 are 0.1uF capacitance, and R88 and R89 are 10K resistance.
Y1 is 32.768KHz crystal oscillator, C22 and C23 are 10pF capacitors, R85 and R84 are 1K resistors, C44 and C43 are 2.2uF capacitors, C29, C28 and C26 are 2.2uF capacitors, Y2 is 8MHz crystal oscillator, and C24 and C25 are 20pF capacitors.
The power supply part comprises an LM2576-5.0 chip U8, an AMS1117-3.3 chip U9 and an AC/DC module, wherein one end of the input end of the AC/DC module is respectively connected with one end of a capacitor C31 and 2 pins of an UU9.8 inductor L1, one pin 1 of the L1 is respectively connected with one end of a capacitor C27, one end of a resistor R56 and one end of a fuse F1, and the other end of the F1 is connected with a P55 end;
the other end of the C31 is respectively connected with the other end of the input end of the AC/DC module and the 4 pin of the L1, the 3 pin of the L1 is respectively connected with the other end of the C27, the other end of the R56 and one end of the inductor L2, the other end of the L2 is connected with the P56 end, the positive pole of the output end of the AC/DC module is respectively connected with the positive pole of the capacitor C69, one end of the capacitor C70 and the +15V end, and the negative pole of the output end of the AC/DC module is respectively connected with the negative pole of the;
a pin 1 of U8 is respectively connected with a +15V end, one end of a capacitor C74 and the anode of a capacitor C75, and the other end of C74 is respectively connected with the cathode of C75, the pin 5 of U8, the pin 3 of U8, the anode of a diode D29, the cathode of the capacitor C76, one end of a capacitor C77 and the ground wire; the cathode of the D29 is respectively connected with the 2 pin of the U8 and one end of an inductor L3, and the other end of the L3 is respectively connected with the 4 pin of the U8, the anode of the C76, the other end of the C77 and the +5V end;
the 3 feet of U9 are connected with +5V end, one end of capacitor C81 and positive pole of capacitor C79, the other end of C81 is connected with negative pole of C79, 1 foot of U9, one end of capacitor C80, negative pole of capacitor C78 and ground wire, the other end of C80 is connected with 2 feet of U9, 4 feet of U9, positive pole of capacitor C78 and +3.3V end.
The F1 is a AC250V3.5A fuse, the L2 is a 2H inductor, the R56 is a 10K resistor, the C27 is a 0.1uF capacitor, the C31 is a 0.1uF capacitor, the C69 is a 100uF/35V capacitor, and the C70 is a 0.1uF/16V capacitor;
c74 is a 0.1uF/25V capacitor, C75 is a 470uF/25V capacitor, D29 is an SS34 diode, L3 is a 100uH inductor, C76 is a 470uF6.3V capacitor, and C77 is a 0.1uF/10V capacitor;
c81 is 0.1uF capacitance, C79 is 47uF/6.3V capacitance, C80 is 0.1uF/10V capacitance, and C78 is 47uF/6.3V capacitance.
The driving circuit 2SD315AI chip U4, 2SD315AI chip U5 and KP101 chip U6, pin 1 and pin 2 of U4 connect +15V terminal, pin 3 of U4 connects PA4 terminal through resistor R49, pin 4 of U4 connects with one end of resistor R51 and one end of resistor R53 respectively, the other end of R51 connects +15V terminal, the other end of R51 connects to ground, pin 5 of U51 connects to ground, pin 6 of U51 connects with one end of resistor R51 and one end of capacitor C51 respectively, the other end of R51 connects with diode D51 anode, diode D51 cathode, one end of resistor R51, D51 cathode connects +15V terminal, the other end of R51 connects with PA 51 terminal and one end of resistor R51 respectively, the other end of R51 connects with D51 anode, ground wire and the other end of C51 respectively;
the pin 7 of U4 is grounded, the pin 8 of U4 is connected with the +15V end, and the pin 9 of U4 is connected with the PA7 end through a resistor R64;
a pin 10 of U4 is respectively connected with one end of a resistor R69 and one end of a capacitor C20, the other end of R69 is respectively connected with the anode of a diode D16, the cathode of a diode D18 and one end of a resistor R68, the cathode of D16 is connected with a +15V end, the other end of R68 is respectively connected with the end of PA6 and one end of a resistor R74, and the other end of R74 is respectively connected with the anode of D18, the ground wire and the other end of C20;
pins 11 and 12 of U4 are grounded;
pins 13-17 of U4 are connected with a +15V end;
pins 18-22 of U4 are grounded;
the pin 23 of U4 connects the cathode of LED E8, the anode of E8 connects VC2 end through the resistance R93;
the pin 24 of the U4 is respectively connected with one end of a resistor R91 and one end of a capacitor C54, the other end of the C54 is grounded, the other end of the R91 is connected with the anode of a diode D26, and the cathode of the D26 is connected with the end P52;
the pin 25 of U4 is connected with the pin 26 of U4, the pin 27 of U4 and the end P47 through a resistor R86;
a pin 28 of the U4 is respectively connected with one end of a capacitor C45, one end of C46, one end of C47 and the end of VC2, and the other end of C45, the other end of C46 and the other end of C47 are grounded;
pins 29 and 30 of U4 are grounded;
a pin 31 of U4 is respectively connected with a pin 32 of U4, one end of a resistor R80, one end of a resistor R76 and the anode of a diode D20, the cathode of D20 is respectively connected with the other end of R76, the other end of R80, one end of the resistor R78 and one end of a resistor R81, and the other end of R81 is respectively connected with the other end of R78 and the end of P45;
the pin 35 of the U4 is connected with the cathode of a light-emitting diode E6, and the anode of E6 is connected with the end VC1 through a resistor R72;
the pin 36 of the U4 is respectively connected with one end of a resistor R66 and one end of a capacitor C18, the other end of the C18 is grounded, the other end of the R66 is connected with the anode of a diode D14, and the cathode of the D14 is connected with the end P43;
the pin 37 of the U4 is respectively connected with the pin 38 of the U4, the pin 39 of the U4 and the P41 end through a resistor R62;
a pin 40 of the U4 is respectively connected with one end of a capacitor C10, one end of a capacitor C11, one end of a capacitor C12 and the end of VC1, and the other end of C10, the other end of C11 and the other end of C12 are grounded;
pins 41 and 42 of U4 are grounded;
a pin 43 of U4 is respectively connected with a pin 44 of U4, one end of a resistor R41, the anode of a diode D8 and one end of a resistor R45, the cathode of D8 is respectively connected with the other end of R41, the other end of R45, one end of a resistor R43 and one end of a resistor R46, and the other end of R46 is respectively connected with the other end of R43 and the end of P37;
a pin 1 and a pin 2 of a U5 are connected with a +15V end, a pin 3 of the U5 is connected with a PD10 end through a resistor R50, a pin 4 of a U5 is respectively connected with one end of a resistor R52 and one end of a resistor R54, the other end of the R52 is connected with the +15V end, the other end of the R54 is grounded, a pin 5 of the U5 is grounded, a pin 6 of the U5 is respectively connected with one end of a resistor R59 and one end of a capacitor C17, the other end of the R59 is respectively connected with an anode of a diode D11, a cathode of a diode D13 and one end of a resistor R58, a cathode of the D11 is connected with the +15V end, the other end of the R58 is respectively connected with a PD11 end and one end of a resistor;
the pin 7 of U5 is grounded, the pin 8 of U5 is connected with the +15V end, and the pin 9 of U5 is connected with the PD13 end through a resistor R65;
a pin 10 of U5 is respectively connected with one end of a resistor R71 and one end of a capacitor C21, the other end of R71 is respectively connected with the anode of a diode D17, the cathode of a diode D19 and one end of a resistor R70, the cathode of D17 is connected with a +15V end, the other end of R70 is respectively connected with the PD12 end and one end of a resistor R75, and the other end of R75 is respectively connected with the anode of D19, the ground wire and the other end of C21;
pins 11 and 12 of U5 are grounded;
pins 13-17 of U5 are connected with a +15V end;
pins 18-22 of U5 are grounded;
the pin 23 of U5 connects the cathode of LED E9, the anode of E9 connects VC2 end through the resistance R94;
the pin 24 of the U5 is respectively connected with one end of a resistor R92 and one end of a capacitor C55, the other end of the C55 is grounded, the other end of the R92 is connected with the anode of a diode D27, and the cathode of the D27 is connected with the end P53;
the pin 25 of U5 is connected with the pin 26 of U5, the pin 27 of U5 and the end P48 through a resistor R87;
a pin 28 of the U5 is respectively connected with one end of a capacitor C48, one end of C49, one end of C50 and the end of VC2, and the other end of C48, the other end of C49 and the other end of C50 are grounded;
pins 29 and 30 of U5 are grounded;
a pin 31 of U5 is respectively connected with a pin 32 of U5, one end of a resistor R82, one end of a resistor R77 and the anode of a diode D21, the cathode of D21 is respectively connected with the other end of R77, the other end of R82, one end of the resistor R79 and one end of a resistor R83, and the other end of R83 is respectively connected with the other end of R79 and the end of P46;
the pin 35 of the U5 is connected with the cathode of a light-emitting diode E7, and the anode of E7 is connected with the end VC1 through a resistor R73;
the pin 36 of the U5 is respectively connected with one end of a resistor R67 and one end of a capacitor C19, the other end of the C19 is grounded, the other end of the R67 is connected with the anode of a diode D15, and the cathode of the D15 is connected with the end P44;
the pin 37 of the U5 is respectively connected with the pin 38 of the U5, the pin 39 of the U5 and the P42 end through a resistor R63;
a pin 40 of the U5 is respectively connected with one end of a capacitor C13, one end of a capacitor C14, one end of a capacitor C15 and the end of VC1, and the other end of C13, the other end of C14 and the other end of C15 are grounded;
pins 41 and 42 of U5 are grounded;
a pin 43 of U5 is respectively connected with a pin 44 of U5, one end of a resistor R42, the anode of a diode D9 and one end of a resistor R47, the cathode of D9 is respectively connected with the other end of R42, the other end of R47, one end of a resistor R44 and one end of a resistor R48, and the other end of R48 is respectively connected with the other end of R44 and the end of P38;
a pin 2 of U6 is respectively connected with one end of a resistor R95 and one end of a capacitor C68, the other end of C68 is respectively connected with a PA8 end and the other end of R95, a pin 3 of U6 is connected with a GND end, a pin 4 of U6 is respectively connected with a +15V end, one end of a capacitor C71 end and the anode of a capacitor C72, and a pin 5 of U6 is respectively connected with the GND end, the other end of C71 and the cathode of the capacitor C72;
the pin 18 of the U6 is respectively connected with one end of a resistor R101, one end of a capacitor C73 and the pin 1 of the TL521 chip U7 through a resistor R100, and the pin 2 of the U7 is respectively connected with the other end of the R101, the other end of the C73 and an OP-end; the 4 pins of U7 are connected with the +3.3V end, and the 3 pins of U7 are connected with the PA7 end;
a pin 17 of U6 is respectively connected with one end of a resistor R99 and one end of QE5, the other end of R99 is respectively connected with a QG5 end, one end of a resistor R97 and one end of a resistor R98, the other end of R98 is connected with a pin 16 of U6, the other end of R97 is connected with a pin 15 of U6, and a pin 13 of U6 is connected with an OP end;
the 12 feet of U6 are connected with the cathode of zener diode ZD14 and one end of resistor R96 respectively, the anode of ZD14 is connected with the 11 feet of U6, the other end of R96 is connected with the cathode of zener diode ZD15, the anode of ZD15 is connected with the anode of diode D28, and the cathode of D28 is connected with the end of QC 5.
kp101 is used to control the duty cycle and two 2SD315AI control the commutation. An H bridge formed by four tubes of Q2, Q3, Q6 and IGBT plays a role in circuit phase change, diagonal turn-on, positive and negative half-cycle switching and phase change.
R is a 4.7K resistor, R is a 10K resistor, R is a 1.2K resistor, R is a 150R resistor, C is a 1nF capacitor, R is a 4.7K resistor, R is a 1.2K resistor, R is a 150R resistor, R is a 4.7K resistor, C is a 1nF capacitor, R is a 3.3K resistor, C is a 152 capacitor, R is a 180R resistor, R is a 47K resistor, C are respectively 0.1uF/25V/T, 100uF/25V/D capacitors, R are 2.7R resistors, D is a BYV26 diode, R is a 3.3K resistor, C is a 152 capacitor, R is a 180R capacitor, R is a 47K resistor, C are respectively 0.1uF/25V/T, 100F/25V/D, 100 uV/D, uR, uV/D capacitors, uR, R are respectively 0.25V/D capacitors, U/25V/D capacitors, R, R46 is a 2.7R resistor, D8 is a BYV26E diode;
r is a 4.7K resistor, R is a 10K resistor, R is a 150R resistor, R is a 1.2K resistor, R is a 4.7K resistor, C is a 1nF capacitor, R is a 4.7K resistor, R is a 150R resistor, R is a 4.7K resistor, R is a 1.2K resistor, C is a 1nF capacitor, R is a 3.3K resistor, C is a 152 resistor, R is a 180R resistor, R is a 47K resistor, C are 0.1uF/25V/T, 100uF/25V/D capacitors, R are 2.7R resistors, D is a BYV26 diode, R is a 3.3K resistor, C is a 152 capacitor, R is a 180R resistor, R is a 47K resistor, C are 0.1uF/25V/T, 100F/25V/D, 100 uV/D, 100 uR, 2.25R, 2 uV/D, R and R are 2.7 nF/R resistors, d9 is a BYV26E diode;
r95 is 470R resistance, C68 is 20pF capacitance, C71 is 0.1uF capacitance, C72 is 100uF25V capacitance, R100 is 1K resistance, R101 is 4.7K resistance, C73 is 20pF capacitance, R99 is 10K resistance, R98 and R97 are 47R resistance, R96 is 470R resistance, ZD15 is 1N4733 diode, D28 is HER107 diode, ZD14 is 1N4746 diode.
The +15V end is respectively connected with a cathode of a voltage stabilizing diode D22, one end of a capacitor C37, one end of a capacitor C38, one end of a capacitor C39, an anode of a capacitor C30, an anode of a capacitor C32 and an anode of a capacitor C33, and an anode of the D22 is respectively connected with a ground wire, the other end of the capacitor C37, the other end of the capacitor C38, the other end of the capacitor C39, an anode of a capacitor C30, a cathode of the capacitor C32 and a cathode of a capacitor C33;
the +15V end is respectively connected with a cathode of a voltage stabilizing diode D23, one end of a capacitor C40, one end of a capacitor C41, one end of a capacitor C42, an anode of a capacitor C34, an anode of a capacitor C35 and an anode of a capacitor C36, and an anode of the capacitor D23 is respectively connected with a ground wire, the other end of the capacitor C40, the other end of the capacitor C41, the other end of the capacitor C42, an anode of a capacitor C34, a cathode of the capacitor C35 and a cathode of a capacitor C36.
The D22 is a 1N4746 diode, the C37 is a 0.1uF/25V/T capacitor, the C38 and the C39 are 100uF/25V/D capacitors, and the C30, the C32 and the C33 are 220uF/25V/GT capacitors;
d23 is a 1N4746 diode, C40 is a 0.1uF/25V/T capacitor, C41 and C42 are 100uF/25V/D capacitors, and C34, C35 and C36 are 220uF/25V/GT capacitors.
The main circuit comprises a FF300R12KS4 tube Q1, an FF300R12KS4 tube Q2, an N-IGBT, an FF300R12KS4 tube Q3 and an FF300R12KS4 tube Q4, wherein a pin 2 of the Q1 is respectively connected with a diode cathode, a QC5 end, one end of a normally open switch of a relay K1 and one end of a switch K2, the other end of the normally open switch of the relay K2 is connected with a PV end, the other end of the K2 is respectively connected with a BT + end and the anode of a battery BT 2, a pin 1 of the Q2 is respectively connected with one end of a resistor R2, the cathode of a voltage stabilizing tube ZD2 and the end of a QG2, the other end of the R2 is respectively connected with the cathode of the voltage stabilizing tube ZD2 and the anode of the QE2, the anode of the ZD2 is respectively connected with the anode of the diode, the QC2, the pin 2 of the Q2, the pin, the anode of the QC2, the cathode of the Q2, the anode of the ZD2 and the cathode of the anode of the cathode 2, the ZD2, the cathode of the anode of the ZD2, the cathode of the Q2, the anode of the, An IGBT collector is connected, an IGBT gate is respectively connected with a QG2 end, a voltage regulator tube ZD8 cathode and one end of a resistor R33, an ZD8 anode is connected with an ZD11 anode, an ZD11 cathode is respectively connected with a QE2 end, the other end of a resistor R33, an IGBT emitter and one end of a Hall current sensor IP1A (the IP1B and the IP1A are elements which are just divided into two parts), a BT-end, a BT1 cathode, a QE4 end, a pin 3 of Q6, one end of the resistor R34, a ZD12 cathode of the voltage regulator tube, the other end of C5 and the other end of C6 are connected, and the other end of the IP1A is connected with a;
a pin 1 of Q3 is respectively connected with a QG3 end, a cathode of a voltage regulator tube ZD4 and one end of a resistor R16, an anode of ZD4 is connected with an anode of a voltage regulator tube ZD6, a cathode of ZD6 is respectively connected with a QE3 end, the other end of R16, a pin 3 of Q3, a QC4 end, one end of a resistor R23, one end of a resistor R26, one end of a resistor R29, a pin 2 of Q6 and the other end of the primary side of a transformer T1, a pin 1 of Q6 is respectively connected with a QG4 end, a cathode of the voltage regulator tube ZD9 and the other end of the resistor R34;
the other end of the C7 is respectively connected with one end of a resistor R22, one end of a resistor R25 and one end of a resistor R28, the other end of the R22 is connected with the other end of the R23, the other end of the R25 is connected with the other end of the R26, and the other end of the R28 is connected with the other end of the R29;
one end of a secondary side of T1 is respectively connected with one end of a capacitor C4 and one end of an inductance element LD2 through an inductance element LD1, the other end of C4 is respectively connected with the other end of a secondary side of T1 and one end of a Hall current sensor IP2A (IP2B and IP2A are just two parts separated), the other end of IP2A is connected with a P20 end, and the other end of LD2 is connected with a P16 end.
PV photovoltaic power generation, at first through IPIA current sensor collection current's state variable, judge the current direction, if the current is reverse then through the CPU control part control switch K1 break-make that ADC0 end is connected, prevent that power from sending the reverse current and filling, prevent that reverse charging from guaranteeing the power supply security.
BT1 is 1200V10AH battery, R5 is 10K resistor, ZD1 and ZD2 are 1N4746 diodes, ZD3 and ZD5 are 1N4746 diodes, R15 is 10K resistor, ZD8 and ZD11 are 1N4746 diodes, R33 is 10K resistor, R22, R23, R25, R26, R28, R29 are 100R resistors, C7 is 1200V/0.47uF capacitor, ZD4 and ZD6 are 1N4746 diodes, R16 is 10K resistor, 9 and ZD12 are 1N4746 diodes, R34 is 10K resistor, C5 and C6 are 1200V470uF capacitors, LD1 is 3P384 × 5/100uH, LD2 is 3P384 × 5/10uH, and C4 is 600V 220.22uf capacitor.
The photovoltaic current and current direction collecting part comprises an HB-PS3.3 (thick Zephyr company) chip IP1B, wherein a pin 1 of the IP1B is respectively connected with an ADC0 end and one end of a resistor R2 through a resistor R1, the other end of the R2 is respectively connected with a pin 4 of the IP1B, a ground wire and a pin 3 of the IP1B, a pin 2 of the IP1B is connected with a +5V end, the +5V end is respectively connected with a positive electrode of a capacitor C1 and one end of a capacitor C2, and a negative electrode of the capacitor C1 is respectively connected with the other end of the capacitor C2 and a GND end.
R1 and R2 are 10K resistors, C1 is 100uF/10V capacitor, and C2 is 0.1uF capacitor.
The storage battery voltage acquisition part comprises a chip HBV-A3.3 (thick applied company), the HIN + end of the chip is connected with the BT + end through a resistor R8, the HIN-end of the chip is connected with the BT-end through a resistor R12, the VCC end of the chip is connected with the +5V end, the GND end of the chip is grounded, the M end of the chip is respectively connected with one end of a resistor R18 and the ADC1 through a resistor R11, and the other end of the R18 is connected with the GND end.
And the R8 and the R12 adopt 47K resistors, and the R11 and the R18 adopt 10K resistors.
The commercial power current collecting part comprises a chip HBC-PS3.3 (thick company) IP2B, wherein a pin 1 of the IP2B is connected with an ADC2 end and one end of a resistor R30 through a resistor R27 respectively, the other end of the resistor R30 is connected with a pin 4 of the IP2B, a pin 3 of the IP2B and a ground wire respectively, a pin 2 of the IP2B is connected with a +5V end, the +5V end is connected with a positive electrode of a capacitor C8 and one end of a capacitor C9 respectively, and a negative electrode of the C8 is connected with the other end of the C9 and a GND end respectively.
The R27 and the R30 adopt 10K resistors, the C8 adopts 100uF/10V capacitors, and the C9 adopts 0.1uF capacitors.
The mains supply voltage acquisition part comprises a mains supply voltage acquisition transformer, one primary side of the mains supply voltage acquisition transformer is connected with a P28 end, and the other primary side of the mains supply voltage acquisition transformer is connected with a P31 end;
one end of a secondary side of the mains voltage acquisition transformer is connected with a cathode of a diode D4 and an anode of a diode D5 respectively, an anode of a diode D4 is connected with an anode of a diode D7, one end of a resistor R39, one end of a resistor R40, an anode of a voltage regulator tube ZD13 and a GND end respectively, a cathode of a diode D7 is connected with the other end of the secondary side of the mains voltage acquisition transformer and an anode of a diode D6 respectively, a cathode of a D6 is connected with a cathode of a D5, the other end of the R39, one end of a resistor R37 and an ADC3 respectively, and the other end of R37.
The primary side of the commercial power voltage acquisition transformer is 100 turns, and the secondary side is 10 turns; r39 is 47R resistor, R37 is 19K resistor, R40 is 1K resistor, and ZD13 is 3.3V voltage regulator tube.
The phase detection circuit comprises a phase detection circuit transformer and an LM358D chip U1, wherein one end of the primary side of the phase detection circuit transformer is respectively connected with one end of a capacitor C3 and one end of a resistor R4, the other end of the R4 is connected with the L end of a mains supply through R3, the other end of the primary side of the phase detection circuit transformer is respectively connected with the other end of a capacitor C3 and one end of a resistor R7, and the other end of the R7 is connected with the L end of the mains supply through R6;
one end of a first secondary side of the phase discrimination circuit transformer is connected with the anode of a diode D1, the cathode of a D1 is connected with an L _ X end, the other end of the first secondary side of the phase discrimination circuit transformer is respectively connected with a GND end and one end of a second secondary side of the phase discrimination circuit transformer, the other end of the second secondary side of the phase discrimination circuit transformer is connected with the anode of a diode D3, and the cathode of a D3 is connected with an N _ X end;
a pin 2 of U1 is connected with a GND end, a pin 3 of U1 is respectively connected with an L _ X end and one end of a resistor R24, the other end of R24 is respectively connected with the GND end, a pin 4 of U1 and an anode of a voltage regulator tube ZD7, a cathode of ZD7 is respectively connected with one end of a resistor R21 and the L _ P end, the other end of R21 is connected with a pin 1 of U1, and a pin 8 of U1 is connected with a +15V end;
the 6 pin of U1 connects GND end, the 5 pin of U1 connects N _ X end, resistance R36 one end separately, the other end of R36 connects GND end, 4 pin of U1, anode of voltage regulator ZD10 separately, ZD10 cathode connects resistance R32 one end, N _ P end separately, another end of R32 connects 7 pin of U1.
R3, R4, R6 and R7 are resistors of 47K, C3 is a capacitor of 0.1uF, the primary side of a phase discrimination circuit transformer is 220 turns, the first secondary side and the second secondary side of the phase discrimination circuit transformer are 5 turns, D1 and D3 are HER107 diodes, R24 and R36 are resistors of 10K, R21 and R32 are resistors of 4.7K, and ZD7 and ZD10 are voltage stabilizing diodes of 3.3V.
The LED indicating part comprises resistors R9, R10, R13, R17 and R20, one end of R9 is connected with a PB2 end, the other end of R9 is connected with an anode of a light emitting diode E1, the cathode of E1 is connected with a GND end, one end of R1 is connected with a PB1 end, the other end of R1 is connected with the anode of the light emitting diode E1, the cathode of E1 is connected with the GND end, one end of R1 is connected with the PB1 end, the other end of R1 is connected with the anode of the light emitting diode E1, and the cathode of E1 is connected with the GND end.
The R9, R10, R13, R17 and R20 adopt 1K resistors.
The RS485 communication part adopts an SP3485 chip U2, a pin 1 of U2 is connected with a PA10 end, pins 2 and 3 of U2 are connected with a PA11 end, a pin 4 of U2 is connected with a PA9 end, a pin 5 of U2 is connected with a GND end, a pin 6 of U2 is respectively connected with an RS485_ A end and one end of a resistor R38, the other end of R38 is connected with a +3.3V end, a pin 7 of U2 is respectively connected with one end of a resistor R35 and the RS485_ B end, the other end of R35 is connected with a GND end, a pin 8 of U2 is connected with a +3.3V end, an RS485_ A end is connected with an RS485_ B end through a resistor R31, an RS485_ A end is connected with a TVS tube Z1, an RS485_ B end is connected with a GND end through a TVS tube Z2, an RS485_ A end is connected with an RS485_ B end through TVS tube Z3, and a GND 485_ B end are respectively connected with an RS485 end and a +15 + GND end through a.
The R31 is 120R resistance, R35 and R38 are 470R resistance, and Z1, Z2 and Z3 are SMBJ5.0CA tubes.
The anti-reverse charging circuit comprises an NPN triode Q4, a collector of a Q4 is connected with one end of a control end of a relay K1 and an anode of a diode D2 respectively, a cathode of the D2 is connected with a +15V end and the other end of a control end of a K1 respectively, a base of a Q4 is connected with one end of a resistor R14 and one end of a resistor R19 respectively, the other end of a R14 is connected with a PB7 end, and the other end of a R19 is connected with a GND end and an emitter of the Q4 respectively.
The D2 adopts an M7 diode, the R14 adopts a 470R resistor, the R19 adopts a 10K resistor, and the Q4 adopts an S8050 diode.
Expanding the Fourier series of the ratio of the voltage at two ends of a single IGBT (the voltage at two ends of Q1 in the circuit diagram) to the voltage at two ends of the energy storage system (the voltage at two ends of BT1 in the circuit diagram), namely:
when n is 1, 3, 5, …, the reason is that
A＝cos(nθc1)+cos(nθc2)+…+cos(nθcN)
B＝sin(nθc1)+sin(nθc2)+…+sin(nθcN)
U is the voltage across the energy storage system, EdA 2 voltage across the single IGBT, an，bnIs coefficient of trigonometric function of Fourier expansion, omega1Is (angular velocity of the modulated wave); in the formula of omegaC(angular velocity of triangular Carrier) a0T (amount of time), θC(phase shift angle of triangular Carrier), θ1(initial phase angle), uAN(rated voltage of A phase), M (amplitude multiple), thetaC1(triangular carrier fundamental phase shift angle), θC2(second harmonic phase shift angle of triangular carrier), thetaCN(rated triangular carrier fundamental wave phase shift angle), k (carrier ratio), x (algebra)
f (x) represents the duty cycle output value at the QG5 end in the circuit diagram.
For N <2N (N represents the number of levels), the output sides (voltages at two ends of C5 and C6) are all power frequency waves, so that higher harmonics can not exist, and the output waveform can be obviously improved after N-time cascading is adopted.
Q2, Q3, IGBT, Q6 are controlled by PA5, PA6, PD11, PD 12. And under the energy storage mode and the grid-connected mode, switching control is conducted on the geminate transistors in each period. And in the isolated network mode, the duty ratio Q1 is controlled to be normally open, Q2 sends an SPWM signal, and Q6 is normally open to only enable Q2 to regulate and control output. Under the off-grid mode, the geminate transistors are opened, and Q1 is normally opened, so that the working efficiency is improved.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims (7)

1. A grid-connected inverter comprises a CPU circuit, a power supply part, a drive circuit, a main circuit, a photovoltaic current and current direction acquisition part, a storage battery voltage acquisition part connected with the input end of the main circuit, a commercial power current acquisition part, a commercial power voltage acquisition part and a commercial power phase demodulation circuit, and is characterized in that the power output port of the power supply part is respectively connected with the power input port of the CPU circuit, the power input port of the drive circuit, the power input port of the photovoltaic current and current direction acquisition part, the power input port of the storage battery voltage acquisition part and the power input port of the commercial power current acquisition part, the detection signal input port of the CPU circuit is respectively connected with the detection signal output port of the photovoltaic current and current direction acquisition part, the detection signal output port of the storage battery voltage acquisition part, the detection signal output port, The detection signal output port of the commercial power voltage acquisition part is connected with the detection signal output port of the commercial power phase discrimination circuit;
the control signal output port of the CPU circuit is connected with the control signal input port of the driving circuit, and the control signal output port of the driving circuit is connected with the control signal input port of the main circuit;
the main circuit comprises a FF300R12KS4 tube Q1, an FF300R12KS4 tube Q2, an N-IGBT, an FF300R12KS4 tube Q3 and an FF300R12KS4 tube Q4, a pin 2 of Q1 is respectively connected with a cathode of a diode, a QC5 end, a normally open switch end of a relay K1, one end of a switch and an anode of a battery BT1, the other end of the normally open switch of the relay K1 is connected with a BT + end, the other end of the switch is connected with a PV end, a pin 1 of Q1 is respectively connected with a resistor R5 end, a cathode of a voltage stabilizing tube 1 and a QG1 end, the other end of R1 is respectively connected with a cathode of a voltage stabilizing tube ZD1 and an end of a QE1, an anode of the ZD1 is connected with an anode of the ZD1, a pin 3 of the Q1 is respectively connected with an anode of the diode, a QC1 end, a pin 2 of the Q1, a pin 2 of the QC1, a cathode of the ZD1, an anode of the ZD1 and an anode of a cathode of a ZD1, a cathode of, An IGBT collector is connected, an IGBT gate is respectively connected with a QG2 end, a voltage regulator tube ZD8 cathode and one end of a resistor R33, an ZD8 anode is connected with an ZD11 anode, an ZD11 cathode is respectively connected with a QE2 end, the other end of a resistor R33, an IGBT emitter, one end of an IP1A, a BT-end, a BT1 cathode, a QE4 end, a pin 3 of Q6, one end of the resistor R34, a ZD12 cathode of the voltage regulator tube, the other end of a C5 and the other end of a C6, and the other end of the IP1A is connected with a;
a pin 1 of Q3 is respectively connected with a QG3 end, a cathode of a voltage regulator tube ZD4 and one end of a resistor R16, an anode of ZD4 is connected with an anode of a voltage regulator tube ZD6, a cathode of ZD6 is respectively connected with a QE3 end, the other end of R16, a pin 3 of Q3, a QC4 end, one end of a resistor R23, one end of a resistor R26, one end of a resistor R29, a pin 2 of Q6 and the other end of the primary side of a transformer T1, a pin 1 of Q6 is respectively connected with a QG4 end, a cathode of the voltage regulator tube ZD9 and the other end of the resistor R34;
the other end of the C7 is respectively connected with one end of a resistor R22, one end of a resistor R25 and one end of a resistor R28, the other end of the R22 is connected with the other end of the R23, the other end of the R25 is connected with the other end of the R26, and the other end of the R28 is connected with the other end of the R29;
one end of a secondary side of T1 is respectively connected with one end of a capacitor C4 and one end of an inductor LD2 through an inductor LD1, the other end of C4 is respectively connected with the other end of the secondary side of T1 and one end of IP2A, the other end of the Hall current sensor IP2A is connected with a P20 end, and the other end of LD2 is connected with a P16 end.
2. The grid-connected inverter according to claim 1, wherein said BT1 is a 1200V10AH battery, R5 is a 10K resistor, ZD1 and ZD1 are 1N4746 diodes, R1 is a 10K resistor, R1 are 100R resistors, C1 is a 1200V/0.47uF capacitor, ZD1 and ZD1 are 1N4746 diodes, R1 is a 10K resistor, C1 and C1 are 1200V470 capacitor, LD1 is 3P384 uH 1, LD1 is LD 3P384, LD1 is v3672 h, and v3672 is a v3672 uF 1C 220.600 uF capacitor.
3. The grid-connected inverter according to claim 1, further comprising an anti-reverse charging circuit of the main circuit, wherein a control signal input port of the anti-reverse charging circuit is connected to a control signal output port of the CPU circuit.
4. The grid-connected inverter according to claim 3, wherein the anti-reverse charging circuit comprises an NPN triode Q4, a collector of Q4 is respectively connected with one end of a control end of a relay K1 and an anode of a diode D2, a cathode of D2 is respectively connected with a +15V end and the other end of a control end of K1, a base of Q4 is respectively connected with one end of a resistor R14 and one end of a resistor R19, the other end of R14 is connected with a PB7 end, and the other end of R19 is respectively connected with a GND end and an emitter of Q4.
5. The grid-connected inverter as claimed in claim 4, wherein D2 is M7 diode, R14 is 470R resistor, R19 is 10K resistor, and Q4 is S8050 diode.
6. The grid-connected inverter according to claim 1, further comprising an LED indicating section, wherein a control signal input port of the LED indicating section is connected to a control signal output port of the CPU circuit.
7. The grid-connected inverter according to claim 1, further comprising an RS485 communication part, wherein a power input port of the RS485 communication part is connected to a power output port of the power supply part, and a communication signal input port of the RS485 communication part is connected to a communication signal output port of the CPU circuit.
CN201910992238.XA 2019-10-18 2019-10-18 Grid-connected inverter Pending CN110601575A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976854A (en) * 2010-11-10 2011-02-16 江苏中澳光伏能源科技有限公司 Photovoltaic power generation single phase grid-connected inverter
CN202513591U (en) * 2012-04-06 2012-10-31 浙江师范大学 Residential home-based photovoltaic grid-connected inverter power generation system
CN103151948A (en) * 2013-02-04 2013-06-12 安徽明赫新能源有限公司 Dual H-bridge high-frequency isolation type photovoltaic grid-connected inverter
CN210431257U (en) * 2019-10-18 2020-04-28 辽宁太阳能研究应用有限公司 Grid-connected inverter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976854A (en) * 2010-11-10 2011-02-16 江苏中澳光伏能源科技有限公司 Photovoltaic power generation single phase grid-connected inverter
CN202513591U (en) * 2012-04-06 2012-10-31 浙江师范大学 Residential home-based photovoltaic grid-connected inverter power generation system
CN103151948A (en) * 2013-02-04 2013-06-12 安徽明赫新能源有限公司 Dual H-bridge high-frequency isolation type photovoltaic grid-connected inverter
CN210431257U (en) * 2019-10-18 2020-04-28 辽宁太阳能研究应用有限公司 Grid-connected inverter

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