CN210431257U

CN210431257U - Grid-connected inverter

Info

Publication number: CN210431257U
Application number: CN201921751107.4U
Authority: CN
Inventors: 赵音; 靳龙飞; 王胜强; 苏秋菊; 康微微; 姜璐
Original assignee: Liaoning Solar Energy R & D Co ltd
Current assignee: Liaoning Solar Energy R & D Co ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-04-28
Anticipated expiration: 2029-10-18

Abstract

A grid-connected inverter belongs to the technical field of inverters, and particularly relates to a grid-connected inverter. The utility model provides a grid-connected inverter that excellent in use effect. The utility model discloses a CPU circuit, the power supply unit, a drive circuit, the main circuit, photovoltaic current and current direction gather the part, connect the battery voltage collection part at the main circuit input end, commercial power current gathers the part, commercial power voltage gathers part and commercial power phase discrimination circuit, its characterized in that power supply unit's electric energy output port respectively with the electric energy input port of CPU circuit, drive circuit's electric energy input port, photovoltaic current and current direction gather the electric energy input port of part, the electric energy input port of battery voltage collection part, the electric energy input port of commercial power current collection part links to each other.

Description

Grid-connected inverter

Technical Field

The utility model belongs to the technical field of the dc-to-ac converter, especially, relate 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 utility model discloses just to above-mentioned problem, provide a grid-connected inverter that excellent in use effect.

For achieving the above object, the utility model discloses a following technical scheme, the utility model discloses a CPU circuit, the power supply unit, a drive circuit, the main circuit, photovoltaic current and current direction acquisition part, connect the battery voltage acquisition part at the main circuit input end, commercial power current acquisition part, commercial power voltage acquisition part and commercial power phase demodulation circuit, its characterized in that power supply unit's electric energy output port respectively with CPU circuit's electric energy input port, drive circuit's electric energy input port, photovoltaic current and current direction acquisition part's electric energy input port, battery voltage acquisition part's electric energy input port, commercial power current acquisition part's electric energy input port links to each other, CPU circuit's detection signal input port respectively with photovoltaic current and current direction acquisition part's detection signal output port, battery voltage acquisition part's detection signal output port, the detection signal output port of battery, 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 utility model discloses still include LED instruction part, LED instruction part's control signal input port links to each other with the control signal output port of CPU circuit.

As another preferred scheme, the utility model discloses still include RS485 communication part, RS485 communication part's electric energy input port links to each other with power supply unit's electric energy output port, and RS485 communication part's communication signal input port links to each other with the communication signal output port of CPU circuit.

As another preferred scheme, still include the anti-reverse charge circuit of main circuit, the control signal input port of preventing reverse charge circuit links to each other with the control signal output port of CPU circuit.

As another preferred scheme, the CPU circuit of the utility model adopts an STM32F407ZET chip U, the 34-37 feet of U are correspondingly connected with ADC-ADC ends respectively, the 40-43 feet of U are correspondingly connected with PA-PA ends respectively, the 100-104 feet of U are correspondingly connected with PA-PA ends respectively, the 105 and 109 feet of U are correspondingly connected with TMS and TCK ends respectively, the 110 foot of U is connected with PA ends, the 46 and 47 feet of U are correspondingly connected with L _Pends respectively, the 48 foot of U is connected with BOOT ends, the 133-137, 139 and 140 feet of U are correspondingly connected with PB-PB ends respectively, the 69 and 70 feet of U are correspondingly connected with PB and PB ends respectively, the 73-76 feet of U are correspondingly connected with PB-PC ends respectively, the 26-29 feet of U are correspondingly connected with PC-PC ends respectively, the 44 and 45 feet of U are correspondingly connected with PC and PC ends respectively, the 96-99 feet of U are correspondingly connected with PC-PC ends respectively, the 111-PC ends of U are correspondingly connected with 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 terminal of the present invention is connected to the positive terminal of the capacitor C56 and one terminal of C57-C67, respectively, and the negative terminal of C56 and the other terminal 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.

As another preferred scheme, the C56 of the present invention is 470uf6.3v capacitor, C57-C67 are 0.1uF capacitor, C53 is 0.1uF capacitor, D24 and D25 are 1N4148 diodes, R90 is 10K resistor, C51 and C52 are 0.1uF capacitor, and R88 and R89 are 10K resistors.

As another preferred solution, 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 present invention includes LM2576-5.0 chip U8, AMS1117-3.3 chip U9 and AC/DC module, one end of input end of AC/DC module is connected with one end of capacitor C31, 2 feet of UU9.8 inductor L1, 1 foot of L1 is connected with one end of capacitor C27, one end of resistor R56, one end of fuse F1, the other end of F1 is connected with 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 of the present invention is AC250V3.5A fuse, L2 is 2H inductor, R56 is 10K resistor, C27 is 0.1uF capacitor, C31 is 0.1uF capacitor, C69 is 100uF/35V capacitor, and C70 is 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, the driving circuit 2SD315AI chip U4, 2SD315AI chip U5 and KP101 chip U6, pin 1 and pin 2 of U4 connect +15V end, pin 3 of U4 connects PA4 end through resistor R49, pin 4 of U4 connects with resistor R51 end and resistor R53 end respectively, the other end of R51 connects +15V end, the other end of R53 connects ground, pin 5 of U4 connects ground, pin 6 of U4 connects with resistor R57 end and capacitor C16 end respectively, the other end of R57 connects with diode D10 anode, diode D12 cathode, resistor R55 end, D10 cathode connects +15V end, the other end of R55 connects with PA5 end and resistor R60 end respectively, the other end of R60 connects with D12 anode, anode ground wire and C16 other end 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.

As another preferred embodiment, the present invention provides that 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 capacitors, R57 are respectively 2.7R byf, R57 is a 1V/T, C57 is a 3V/25V/D, R57 is a 3V/C57, C57 is a C57, R57 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 preferred scheme, the +15V end of the present invention is respectively connected to the zener diode D22 cathode, the capacitor C37 one end, the capacitor C38 one end, the capacitor C39 one end, the capacitor C30 anode, the capacitor C32 anode, and the capacitor C33 anode, and the D22 anode is respectively connected to the ground line, the capacitor C37 other end, the capacitor C38 other end, the capacitor C39 other end, the capacitor C30 anode, the capacitor C32 cathode, and the capacitor C33 cathode;

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 of the utility model is a 1N4746 diode, C37 is 0.1uF/25V/T capacitance, C38 and C39 are 100uF/25V/D capacitance, C30, C32, C33 are 220uF/25V/GT capacitance;

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 preferred scheme, the main circuit of the present invention includes a FF300R12KS 4Q 1, a FF300R12KS 4Q 2, an N-IGBT, a FF300R12KS 4Q 3, and a FF300R12KS 4Q 4, a pin 2 of Q1 is connected to a cathode of a diode, a QC5 terminal, 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 to a PV terminal, the other end of K2 is connected to a BT + terminal and an anode of a battery BT1, a pin 1 of Q1 is connected to 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 connected to a cathode of a regulator tube ZD1 and a Q1 terminal, an anode of a Q1 is connected to an anode of a Q1, a pin 3 of a diode, a QC1 terminal, a pin 72, a pin 2 of a Q1, a Q1 terminal, an anode of a Q1, a ZD1 and a cathode of a ZD1 are connected to an anode of a regulator tube ZD1, a cathode of a ZD1, a ZD 72 and a cathode of a ZD1 are connected to a cathode of, 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, the BT1 of the present invention 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 a 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 1 uH, LD1 is 3P384 ul 1 ul, v220.72 ul capacitor.

As another preferred scheme, the photovoltaic current and current direction collection part of the utility model includes HB-PS3.3 chip IP1B, 1 pin of IP1B is connected with ADC0 end, resistance R2 one end respectively through resistance R1, the R2 other end is connected with 4 pins of IP1B, ground wire, 3 pins of IP1B respectively, 2 pins of IP1B connect +5V end, +5V end is connected with electric capacity C1 positive pole, electric capacity C2 one end respectively, electric capacity C1 negative pole is connected with electric capacity C2 other end, GND terminal respectively.

As another preferred scheme, the utility model discloses an R1 and R2 are 10K resistance, and C1 is 100uF/10V electric capacity, and C2 is 0.1uF electric capacity.

As another preferred scheme, the battery voltage acquisition part includes the chip, and the HIN + end of chip connects BT + end through resistance R8, and the HIN-end of chip connects BT-end through resistance R12, and the VCC termination +5V end of chip, the GND end ground connection of chip, the M end of chip pass through resistance R11 respectively with resistance R18 one end, ADC1 end link to each other, R18 another termination GND end.

In another preferred embodiment, the resistors R8 and R12 of the present invention are 47K resistors, and the resistors R11 and R18 are 10K resistors.

As another preferred scheme, the utility model discloses a commercial power current acquisition part includes chip IP2B, and 1 foot of IP2B is passed through resistance R27 and is linked to each other with ADC2 end, resistance R30 one end respectively, and the resistance R30 other end links to each other with 4 feet of IP2B, 3 feet of IP2B, ground wire respectively, and 2 feet of IP2B connect +5V end, +5V end links to each other with electric capacity C8 positive pole, electric capacity C9 one end respectively, and the C8 negative pole links to each other with the C9 other end, GND end respectively.

As another preferred scheme, the utility model discloses R27 and R30 adopt 10K resistance, and C8 adopts 100uF/10V electric capacity, and C9 adopts 0.1uF electric capacity.

As another preferred scheme, the utility model discloses the mains voltage acquisition part includes the mains voltage acquisition transformer, and a primary side termination P28 end of the mains voltage acquisition transformer, and another primary side termination P31 end of the mains voltage acquisition transformer;

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 utility model 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, phase discrimination circuit includes phase discrimination circuit transformer and LM358D chip U1, and phase discrimination circuit transformer primary side one end links to each other with electric capacity C3 one end, resistance R4 one end respectively, and the R4 other end connects commercial power L end through R3, and phase discrimination circuit transformer primary side other end links to each other with electric capacity C3 other end, resistance R7 one end respectively, and the R7 other end connects commercial power L end 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.

As another preferred scheme, the utility model discloses R3, R4, R6, R7 are 47K resistance, C3 is 0.1uF electric capacity, phase discrimination circuit transformer primary is 220 circles, the first secondary side of phase discrimination circuit transformer and second secondary side are 5 circles, D1 and D3 are the HER107 diode, R24 and R36 are 10K resistance, R21 and R32 are 4.7K resistance, ZD7 and ZD10 are 3.3V zener diode.

As another preferred scheme, the LED indication portion 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 of the present invention are 1K resistors.

As another preferred scheme, the RS485 communication part of the present invention adopts SP3485 chip U2, pin 1 of U2 connects with PA10, pin 2 and pin 3 of U2 connect with PA11, pin 4 of U2 connects with PA9, pin 5 of U2 connects with GND, pin 6 of U2 connects with RS485_ a end and resistor R38 end, the other end of R38 connects with +3.3V end, pin 7 of U2 connects with resistor R35 end and resistor R485 _ B end, the other end of R35 connects with GND, pin 8 of U2 connects with +3.3V end, end RS485_ a connects with end RS485_ B through resistor R31, end RS485_ a connects with GND through TVS tube Z1, end RS485_ B connects with end through TVS tube Z2, end RS485_ a connects with end through TVS tube Z3, pin 1P 26, pin 1P 3 and pin 3 + RS 485B, end, and RS485 end connect with end +15 + RS 485B + 2.

In another preferred embodiment, the R31 of the present invention is 120R resistor, R35 and R38 are 470R resistor, and Z1, Z2 and Z3 are SMBJ5.0CA tubes.

Secondly, prevent reverse charge circuit includes NPN triode Q4, Q4's collecting electrode respectively with relay K1's control end one end, diode D2 positive pole links to each other, the D2 negative pole respectively with +15V end, K1's the control end other end links to each other, Q4's base respectively with resistance R14 one end, resistance R19 one end links to each other, R14 another termination PB7 end, the R19 other end links to each other with GND end, Q4's projecting pole respectively.

In addition, D2 adopts M7 diode, and R14 adopts 470R resistance, and R19 adopts 10K resistance, and Q4 adopts the S8050 diode.

The utility model has the advantages of.

The utility model discloses a mutually supporting of each part can carry out high-efficient, reliable photovoltaic contravariant that is incorporated into the power networks.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description. The scope of protection of the present invention is not limited to the following description.

Fig. 1 and 2 are schematic diagrams of the main circuit of the present invention.

Fig. 3 is the circuit schematic diagram of the photovoltaic current and current direction collecting part of the utility model.

Fig. 4 is a schematic circuit diagram of the battery voltage collecting part of the present invention.

Fig. 5 is a schematic circuit diagram of the utility model of the commercial power current collecting part.

Fig. 6 is a schematic diagram of a circuit of the utility model.

Fig. 7 is a schematic diagram of the phase demodulation circuit of the present invention.

Fig. 8 is a schematic circuit diagram of the LED indicating part of the present invention.

Fig. 9 is a schematic diagram of the anti-reverse charging circuit of the present invention.

Fig. 10 is a schematic circuit diagram of the RS485 communication part of the present invention.

Fig. 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 utility model discloses a CPU circuit, the power supply unit, a drive circuit, a main circuit, photovoltaic current and current direction acquisition part, connect the battery voltage acquisition part at the main circuit input end, commercial power current acquisition part, commercial power voltage acquisition part and commercial power phase demodulation circuit, the electric energy output port of power supply unit respectively with the electric energy input port of CPU circuit, the electric energy input port of drive circuit, the electric energy input port of photovoltaic current and current direction acquisition part, the electric energy input port of battery voltage acquisition part, the electric energy input port of commercial power current acquisition part links to each other, the detected signal input port of CPU circuit respectively with the detected signal output port of photovoltaic current and current direction acquisition part, the detected signal output port of battery voltage acquisition part, the detected signal output port of commercial power current acquisition part, the detected signal, 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;

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 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;

the 6 pins of the U3 are connected with a VBAT end;

a pin 25 of U3 is connected with a RESET end;

pins

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;

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 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;

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;

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;

pins 29 and 30 of U4 are grounded;

pins 41 and 42 of U4 are grounded;

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;

pins 29 and 30 of U5 are grounded;

pins 41 and 42 of U5 are grounded;

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;

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 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;

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;

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;

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;

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.

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 above 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 still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.

Claims

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;

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.