CN116599237B - High-frequency isolation circuit for power grid side of energy storage inverter - Google Patents
High-frequency isolation circuit for power grid side of energy storage inverter Download PDFInfo
- Publication number
- CN116599237B CN116599237B CN202310869629.9A CN202310869629A CN116599237B CN 116599237 B CN116599237 B CN 116599237B CN 202310869629 A CN202310869629 A CN 202310869629A CN 116599237 B CN116599237 B CN 116599237B
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- circuit
- diode
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 31
- 238000004146 energy storage Methods 0.000 title claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 127
- 238000005070 sampling Methods 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 4
- 150000004706 metal oxides Chemical class 0.000 abstract description 4
- 239000004065 semiconductor Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000001914 filtration Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention belongs to the technical field of inverters, and discloses a high-frequency isolation power taking circuit at the power grid side of an energy storage inverter, which comprises a main circuit, a feedback circuit, a soft start and protection circuit and an auxiliary source circuit, wherein the feedback circuit, the soft start and protection circuit and the auxiliary source circuit are connected with the main circuit, power grid alternating current is input to a high-frequency isolation power taking input end after being rectified, the power grid alternating current is filtered and then is sent to a primary side of a high-frequency transformer T10, the primary side of the transformer controls the on and off of a switch MOS (metal oxide semiconductor) transistor Q114 through a high-frequency PWM (pulse width modulation) sent by a main control U42, the filtered direct current is changed into high-frequency square wave alternating current, the high-frequency transformer transmits energy to a secondary side to charge a bus, the secondary side outputs voltage stabilization through an isolation feedback circuit, and a short-circuit protection circuit turns off the primary side PWM to the bus to charge when the bus is short-circuited, so that the whole machine is prevented from being damaged by the power grid, and the short circuit is prevented. The invention has the beneficial effects that: isolation electricity taking, high efficiency and safety, short-circuit protection function, effective avoidance of the condition of frying machine caused by output short circuit, and high circuit safety.
Description
Technical Field
The invention relates to the technical field of inverters, in particular to a high-frequency isolation power taking circuit at the power grid side of an energy storage inverter.
Background
With the advancement of solar cell technology and the development of inverter technology, photovoltaic inverters have been developed for decades from simple inverters in the 70 th century of 20 to intelligent inverters that are now efficient and reliable. The photovoltaic inverter is independently powered on and off, the bus needs to be charged to be higher than or equal to the direct-current voltage value after alternating current rectification, otherwise, the voltage difference can be used for affecting the whole normal operation of the circuit by transient large-current impact, and even the machine is damaged. However, the power grid starting and power taking mode is always a mode of charging a bus capacitor by a rectifying string resistor, a certain potential safety hazard is reserved, and the power grid side high-frequency isolation power taking of the novel energy storage inverter forms a future necessary trend.
In order to prevent that the bus voltage is lower than the grid rectification direct current voltage value when the power grid is independently started, a bus charging circuit is usually added according to the instant heavy current, but the current rectifying string resistance mode does not meet the requirements of modern high reliability and high safety, therefore, a novel high-frequency isolation power taking circuit on the power grid side of the energy storage inverter with a short circuit protection function is necessarily designed, the high-frequency isolation power taking circuit can work normally under the condition of bus short circuit, the condition that the power grid strongly charges the bus cannot occur, and the safety and the high reliability of the whole machine are greatly ensured.
Disclosure of Invention
The invention discloses a high-frequency isolation circuit for an energy storage inverter power grid side, which can effectively solve the technical problems related to the background technology.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the high-frequency isolation power-taking circuit at the power grid side of the energy storage inverter comprises a main circuit, a feedback circuit, a soft start and protection circuit and an auxiliary source circuit, wherein the feedback circuit, the soft start and protection circuit and the auxiliary source circuit are connected with the main circuit;
the main circuit comprises a resistor R682, a capacitor C439 and a main control chip, wherein the positive input end of a power grid is respectively connected with the resistor R682 and the capacitor C439, the resistor R682 is respectively connected with a capacitor C433, a resistor R683, a capacitor C443 and a transformer T10 pin 1, the resistor R682 is connected with a pin 2 of a MOS tube Q109 through a resistor R10, a resistor R12 and a resistor R11, the resistor R682 is connected with the negative end of a diode Z34 through a resistor R678, a resistor R679, a resistor 680, a resistor R684, a resistor 690 and a resistor R691, the positive end of the diode Z34 is respectively connected with the negative end of a diode Z35, a resistor R677, a pin 1 of the MOS tube Q109 and a port ON/OFF2, the negative end of the MOS tube Q109 is respectively connected with a capacitor C434, a capacitor C446, a pin 7 of the main control chip and a port 2, and the positive end of the capacitor C439, the capacitor C433, the positive end of the diode Z35, the resistor R677 and the negative end of the power grid C446 are respectively connected with the positive end of the MOS tube Q109;
the main control chip pin 1 is respectively connected with a pin 4 of the optical coupler OT4, a resistor R658, a capacitor C444 and a port COMP2, the main control chip pin 3 is respectively connected with a capacitor C442 and a resistor R685, the resistor R685 is respectively connected with a resistor R676, a pin 3 of the MOS transistor Q114 and a resistor R16, the resistor R16 is connected with a resistor R15, the pin 3 of the optical coupler OT4, the resistor R658, the capacitor C444, the main control chip pin 2, the capacitor C442 and the resistor R15 are connected with a power grid negative input end, the main control chip pin 4 is respectively connected with a capacitor C436 and a resistor R657, the resistor R657 is respectively connected with a right end of the capacitor C435, a pin 8 of the main control chip and a port VREF2, the left end of the capacitor C435 is respectively connected with a capacitor C436, a pin 5 of the main control chip and a power grid negative input end, the main control chip pin 6 is respectively connected with a diode D117 negative end and a resistor R673, the positive end of the diode D117 is connected with a resistor R674, the resistor R673 and the negative end of the MOS transistor Q114 are respectively connected with a diode R673 and a resistor R118, and the positive end of the resistor R683 is respectively connected with a resistor C114;
the transformer T10 pin 8 is respectively connected with a resistor R14 and a capacitor C448, the resistor R14 is connected with the negative end of the voltage output end, the transformer T10 pin 11 is connected with the positive end of a diode D1, the negative end of the diode D1 is connected with the positive end of a diode D2, the negative end of the diode D2 is respectively connected with the capacitor C448 and a resistor R13, and the resistor R13 is connected with the positive end of the voltage output end.
As a preferred improvement of the present invention: the resistor R10, the resistor R11 and the resistor R12 are current limiting resistors.
As a preferred improvement of the present invention: the diode Z34 and the diode Z35 are zener diodes.
As a preferred improvement of the present invention: the transformer T10 is a high-frequency transformer.
As a preferred improvement of the present invention: the capacitor C439 and the capacitor C446 are polar capacitors, and the capacitor C433 and the capacitor C443 are nonpolar capacitors.
As a preferred improvement of the present invention: the feedback circuit comprises an integrated circuit U43, a resistor R659, a capacitor C437 and a resistor R660 are respectively connected to a pin 1 of the optical coupler OT4, the resistor R659 and the capacitor C437 are both connected with the resistor R9, the resistor R9 is connected with an output voltage sampling feedback positive end through a resistor R8, a pin 2 of the optical coupler OT4 is respectively connected with a resistor R661, a pin 3 of the integrated circuit U43 and the rear end of the resistor R660, the resistor R661 is connected with the front end of the capacitor C438, the rear end of the capacitor C438 is respectively connected with the pin 1 of the integrated circuit U43, a resistor R7 and a resistor R663, the resistor R663 and the pin 2 of the integrated circuit U43 are both connected with an output voltage sampling feedback negative end, the resistor R7 is connected with an output voltage sampling feedback positive end through a resistor R664, a resistor R662, a resistor R484 and a resistor R665, the output voltage sampling feedback positive end is connected to a junction of a diode D2 negative end and the resistor R13 and the rear end of the capacitor C448, and the junction point of the output voltage sampling feedback positive end is connected with a resistor T10 and the junction point of the resistor C448.
As a preferred improvement of the present invention: the auxiliary source circuit comprises an integrated circuit U45, a transformer T10 pin 5 is respectively connected with a capacitor C452, a capacitor C451, an integrated circuit U45 pin 2 and a power grid negative input end, a transformer T10 pin 6 is connected with a diode D119 positive end, the diode D119 negative end is respectively connected with the capacitor C452, the capacitor C451 and the integrated circuit U45 pin 1, and an integrated circuit U45 pin 3 is connected with a port VCC2 through a resistor R703.
As a preferred improvement of the present invention: the soft start and protection circuit comprises an integrated circuit U44, a port COMP2 is connected with a resistor R6, the resistor R6 is respectively connected with a pin 1 of the integrated circuit U44, a resistor R5 and a capacitor C441, a pin 3 of the integrated circuit U44 is connected with a resistor R4, a port VCC2 is respectively connected with a resistor R3, the resistor R2 is connected with a pin 3 of a triode Q113, the resistor R3 is respectively connected with the resistor R4 and the pin 1 of the triode Q113, a pin 2 of the triode Q113 is respectively connected with a capacitor C440, a resistor R667 and a pin 1 of a MOS (metal oxide semiconductor) Q112, a pin 2 of the MOS (metal oxide semiconductor) Q112 is respectively connected with a negative end of a diode D115 and a negative end of a diode D116, a pin 3 of the MOS (metal oxide semiconductor) Q112, a capacitor C440, a pin 2 of the integrated circuit U44, a resistor R5 and a capacitor C441 are respectively connected with a negative input end of a power grid, a port ON/OFF2 is respectively connected with a positive end of the diode D116, a positive end of the diode C1 is respectively connected with a negative end of the diode C110, a negative end of the diode C1 is connected with a negative end of the diode C110, and a positive end of the diode C110 is respectively connected with a positive end of the diode C110.
As a preferred improvement of the present invention: the grid alternating current is input to a positive input end and a negative input end of the grid after rectification.
The beneficial effects of the invention are as follows:
the power grid alternating current is input to a high-frequency isolation electricity taking input end after rectification, is sent to the primary side of a high-frequency transformer T10 after filtration, the primary side of the transformer controls the on and off of a switch MOS tube Q114 through a high-frequency PWM sent by a main control U42, the filtered direct current is changed into high-frequency square wave alternating current, energy is transmitted to a secondary side through the high-frequency transformer to charge a bus, the secondary side outputs voltage stabilization through an isolation feedback circuit, a short-circuit protection circuit stops the primary side PWM to charge the bus when the bus is short-circuited, the whole machine is protected from being damaged by the power grid, the isolated charging and short-circuit protection are carried out, an intermittent mode can be entered when the bus is short-circuited, and the short-circuit damage of the circuit is prevented from being caused by the strong charging of the bus by the bus short-circuit power grid.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic diagram of a prior art circuit;
fig. 2 is a schematic diagram of an application scenario of the present invention.
FIG. 3 is a schematic diagram of a grid-side high frequency isolation power extraction circuit of an energy storage inverter according to the present invention;
FIG. 4 is a schematic diagram of a main circuit of the present invention;
FIG. 5 is a schematic diagram of a main circuit startup portion of the present invention;
FIG. 6 is a schematic diagram of a main control portion of the main circuit of the present invention;
FIG. 7 is a schematic diagram of the output portion of the main circuit of the present invention;
FIG. 8 is a schematic diagram of a feedback circuit according to the present invention;
FIG. 9 is a schematic diagram of an auxiliary source circuit of the present invention;
FIG. 10 is a schematic diagram of the soft start and protection circuit of the present invention.
Description of the embodiments
The technical solutions of the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Referring to fig. 3, the invention provides a high-frequency isolation power-taking circuit at the power grid side of an energy storage inverter, which comprises a main circuit, a feedback circuit, a soft start and protection circuit and an auxiliary source circuit, wherein the feedback circuit, the soft start and protection circuit and the auxiliary source circuit are connected with the main circuit. The power grid charging device is used for charging the bus capacitor group through power grid isolation, and outputting 400VDC direct current after the power grid is rectified through a starting module, a main control module, a feedback module, a soft start and short circuit protection module and an auxiliary power module, so that the direct current bus is charged to 400VDC. The circuit also comprises an intermittent module, wherein the intermittent module is a U42 of the main control module, a pin 1 of the U42 is connected with an emitter of the soft-start triode Q110, and a base electrode of the soft-start triode Q110 is connected with a D electrode of the short-circuit protection MOS tube Q112 through a diode D115. When the output is not short-circuited, the output is soft-started, the output voltage is slowly boosted, the voltage of the pin 1 of the U42 is slowly increased, the output MOS tube Q112 for short-circuit protection is conducted when the output is short-circuited, the base potential of the triode Q110 for soft starting is pulled down through the diode D115, the base potential of the triode Q110 for soft starting is pulled down, the conduction of the Q110 is used for pulling down the pin 1 potential of the U42, the U42 stops generating waves to enter an intermittent mode, thereby cutting off the connection between a power grid and the whole machine, continuously detecting whether an output bus is normal or not through intermittent wave generation, and if the bus is normal, exiting the intermittent mode to normally isolate for charging the bus, wherein the structure is more stable because the isolation and the short circuit can enter the intermittent mode, and the intermittent wave generation of the U42 is detected at intervals of fixed time to detect whether the short circuit disappears or not. The bus short-circuit protection device has the advantages that the charging and short-circuit protection are isolated, an intermittent mode can be entered when the bus is short-circuited, and short-circuit damage of the bus, which is forced to charge the bus by the bus short-circuit power grid, is prevented. The bus can be effectively prevented from being strongly charged by the power grid when the bus is short-circuited through the short-circuit protection function, and the situation of the explosion caused by the strong charging of the power grid to the bus is avoided.
The filtering module comprises a large-polarity capacitor C439 and a nonpolar capacitor C433 which are connected in parallel through a series protection resistor R682, filters after rectifying a power grid, and is then connected in parallel to the starting module and a high-frequency isolation boosting module (MOS tube Q114), and a diode D110 of the starting module is connected in series to a VCC pin of the main control module U42. The output of the main control module is connected to the G pole of the MOS tube Q114 of the high-frequency isolation module, the MOS tube Q114 is connected in series with the high-frequency transformer T10, the two ends of the high-frequency transformer are connected with the absorption module in parallel, and the absorption module is used for absorbing the energy of the leakage inductance of the transformer when the switch MOS tube Q114 is turned off to prevent the MOS tube Q114 from being damaged by excessively high voltage spikes. The main control module generates high-frequency PWM (pulse width modulation) and transmits energy to the secondary side through the high-frequency transformer, the output is rectified through diodes D1 and D2, C488 capacitance filtering is fed back and stabilized through the feedback module, if an output short circuit is detected by the short circuit module, the short circuit protection module can pull down pin 1 of U42 of the main control module, the switch MOS tube Q114 is turned off, the high-frequency transformer stops transmitting energy to the secondary side, and damage of a bus short circuit power grid to a circuit is effectively avoided.
Referring to fig. 4-7, the main circuit includes a resistor R682, a capacitor C439, and a main control chip, where a positive input end of a power grid is connected to the resistor R682 and the capacitor C439, the resistor R682 is connected to the capacitor C433, the resistor R683, the capacitor C443, and the transformer T10 pin 1, the resistor R682 is connected to the pin 2 of the MOS transistor Q109 via the resistor R10, the resistor R12, and the resistor R11, the resistor R682 is connected to a negative end of the diode Z34 via the resistors R678, R679, R680, R684, R690, and R691, a positive end of the diode Z34 is connected to a negative end of the diode Z35, the resistor R677, the pin 1 of the MOS transistor Q109, and the port ON/OFF2, the pin 3 of the MOS transistor Q109 is connected to a positive end of the diode D110, and the negative end of the diode D110 is connected to the capacitor C446, the pin 7 of the main control chip, and the port VCC2, and the positive end of the diode C433, the diode Z35, the positive end of the capacitor C446, and the power grid input end of the capacitor C434.
The main control chip pin 1 is respectively connected with a pin 4 of the optical coupler OT4, a resistor R658, a capacitor C444 and a port COMP2, the main control chip pin 3 is respectively connected with a capacitor C442 and a resistor R685, the resistor R685 is respectively connected with a resistor R676, a pin 3 of the MOS tube Q114 and a resistor R16, the resistor R16 is connected with a resistor R15, the pin 3 of the optical coupler OT4, the resistor R658, the capacitor C444, the capacitor C442 and the resistor R15 are connected with a power grid negative input end, the main control chip pin 4 is respectively connected with a capacitor C436 and a resistor R657, the resistor R657 is respectively connected with a right end of the capacitor C435, the main control chip pin 8 and a port VREF2, the left end of the capacitor C435 is respectively connected with a capacitor C436, the main control chip pin 5 and a power grid negative input end, the main control chip pin 6 is respectively connected with a diode D117 negative end and a resistor R673, the positive end of the diode D117 is connected with a resistor R674, the resistor R673, the resistor R676 is respectively connected with a positive end of the MOS tube Q114 and the resistor R118 is respectively connected with a positive end of the MOS tube Q118. The transformer T10 pin 8 is respectively connected with a resistor R14 and a capacitor C448, the resistor R14 is connected with the negative end of the voltage output end, the transformer T10 pin 11 is connected with the positive end of a diode D1, the negative end of the diode D1 is connected with the positive end of a diode D2, the negative end of the diode D2 is respectively connected with the capacitor C448 and a resistor R13, and the resistor R13 is connected with the positive end of the voltage output end.
In particular, the invention discloses a high-frequency isolation power-taking circuit at the power grid side of an inverter, which charges a direct-current bus through power grid rectification isolation boosting under the condition that a photovoltaic inverter only has an independent power grid starting machine. The power grid alternating current is rectified through a rectifier bridge and then is input to the two ends of a positive input end (DC+) of the power grid and the two ends of a negative input end (DC-) of the power grid, the high-frequency isolation flyback circuit topology is mainly used for isolating and outputting 400VDC direct current to charge a bus capacitor bank, the input DC+ and DC-are connected with a starting circuit through a filtering module, the starting module is connected with voltage stabilizing diodes Z34 and Z35 through starting resistors R678-R691 to supply power to a G-pole starting signal of a MOS tube Q109, the Q109 is conducted, and the input voltage supplies power to a main control chip U42 through current limiting resistors R10, R11 and R12 and a diode D110. The main control chip U42 works to send out a high-frequency PWM control switch MOS tube Q114 and a high-frequency transformer T10 to isolate a boosting module for boosting, the output is stabilized to 400V through a feedback module, after the output is normal, the auxiliary power supply module voltage is raised to 17V to stabilize VCC2 to 15V through U45, the starting module is disconnected with the main control module because of the reverse cut-off of a diode D110, and the soft start and short circuit protection module is used for capacitor transient short circuit protection during the starting.
Port description: DC+ and DC-are grid rectification input ends, VO+ and VO-are output voltage sampling feedback ends, BUS+ and BUS-are final voltage output ends, COMP2 is a short-circuit protection control port, after short-circuit is output, the COMP2 port is forcedly pulled down to zero potential through a short-circuit protection circuit, and main control wave generation is stopped to carry out short-circuit protection. In the figure, the same network reference numerals represent that two ports are connected together, and components OT4-A and OT4-B are one element, but are conveniently separated for circuit view, and high-frequency transformers T10A-C are the same and are separated into a plurality of pictures for one device. Pins 1 and 3 of the transformer T10 correspond to one coil, pins 5 and 6 correspond to one coil, and pins 8 and 11 correspond to one coil.
As an implementation manner, the resistor R10, the resistor R11 and the resistor R12 are current limiting resistors, the diode Z34 and the diode Z35 are voltage stabilizing diodes, the transformer T10 is a high-frequency transformer, the capacitor C439 and the capacitor C446 are polar capacitors, the capacitor C433 and the capacitor C443 are nonpolar capacitors, and the grid alternating current is input to the grid positive input end and the grid negative input end after rectification. It should be further noted that other components are adopted to achieve the above effects, and should be within the scope of the present invention.
Referring to fig. 8, the feedback circuit includes an integrated circuit U43, a pin 1 of the optical coupler OT4 is connected to a resistor R659, a capacitor C437 and a resistor R660, the resistor R659 and the capacitor C437 are connected to a resistor R9, the resistor R9 is connected to an output voltage sampling feedback positive terminal via a resistor R8, a pin 2 of the optical coupler OT4 is connected to a resistor R661, a pin 3 of the integrated circuit U43 and a rear end of the resistor R660, the resistor R661 is connected to a front end of the capacitor C438, a rear end of the capacitor C438 is connected to a pin 1 of the integrated circuit U43, a resistor R7 and a resistor R663, the resistor R663 and a pin 2 of the integrated circuit U43 are connected to an output voltage sampling feedback positive terminal, the output voltage sampling feedback positive terminal is connected to a junction point of the diode D2 and the resistor R13 and a junction point of the capacitor C448, and the junction point of the output voltage sampling feedback terminal of the resistor T448 and the capacitor C8 are connected to the junction point of the resistor R10.
Referring to fig. 9, the auxiliary circuit includes an integrated circuit U45, a transformer T10 pin 5 is respectively connected to a capacitor C452, a capacitor C451, a integrated circuit U45 pin 2 and a grid negative input terminal, a transformer T10 pin 6 is connected to a diode D119 positive terminal, a diode D119 negative terminal is respectively connected to the capacitor C452, the capacitor C451 and the integrated circuit U45 pin 1, and the integrated circuit U45 pin 3 is connected to a port VCC2 via a resistor R703.
Referring to fig. 10, the soft start and protection circuit includes an integrated circuit U44, a port COMP2 is connected to a resistor R6, the resistor R6 is connected to a pin 1 of the integrated circuit U44, a resistor R5 and a capacitor C441, a pin 3 of the integrated circuit U44 is connected to a resistor R2 and a resistor R3, a pin 3 of a transistor Q113 is connected to a port VCC2, the resistor R3 is connected to the resistor R4 and the pin 1 of the transistor Q113, a pin 2 of the transistor Q113 is connected to a capacitor C440, a resistor R667 and a pin 1 of a MOS diode Q112, a pin 2 of the MOS diode Q112 is connected to a negative terminal of a diode D115 and a negative terminal of a diode D116, a pin 3 of the MOS diode Q112, a resistor R667, a capacitor C440, a pin 2 of the integrated circuit U44, a resistor R5 and a capacitor C441 are all connected to a negative input terminal, a port ON/OFF2 is connected to a positive terminal of the power grid D4 and a negative terminal of the transistor C116, a positive terminal of the diode D1 is connected to a negative terminal of the diode D110, and a positive terminal of the diode D110 is connected to a positive terminal of the diode D110, and a negative terminal of the diode D110 is connected to a negative terminal of the diode D1 of the diode D110.
Working principle: the power grid alternating current is rectified and then is input to two ends of DC & lt+ & gt and DC & lt- & gt, the DC & lt+ & gt and DC & lt- & gt are input to be connected with a starting circuit through filtering of a filtering module C439 and a filtering module C433, the starting circuit module supplies power to a G-pole starting voltage signal of a MOS tube Q109 through resistors R678-R691 and voltage stabilizing diodes Z34 and Z35, the MOS tube Q109 is conducted, and the input voltage supplies power to a main control module U42 through current limiting resistors R10, R11 and R12 and a diode D110.
The main control module works to send out high-frequency PWM control Q114 to store energy and release energy to the high-frequency transformer T10, the high-frequency transformer T10 stores energy when the switch MOS tube Q114 is turned on, the secondary side diodes D1 and D2 are turned off due to the reverse direction, and the secondary side diodes D1 and D2 conduct the high-frequency transformer T10 to transmit energy to the secondary side when the switch MOS tube Q114 is turned off. The output is sampled by a feedback module U43 (model AZ 431) and is isolated from an optocoupler OT4 (AB) and fed back to a main control U42 to control the duty ratio of PWM, so that the output is stabilized to 400VDC, the voltage of an auxiliary voltage module rises to 17V after the output is stabilized normally, the voltage is stabilized to 15V by a U45 (voltage stabilizing chip 7815), a starting module is disconnected with the main control module due to the reverse cut-off of a diode D110, the main control module is disconnected with the starting module, and the main control is powered by the auxiliary voltage module.
The output short circuit protection intermittent mode and the soft start and short circuit protection module, the current limiting module and the main control module act together, and when the output is short circuit: the output MOS tube Q112 of the short-circuit protection is conducted, the base potential of the triode Q110 of the soft start is pulled down through the diode D115, the triode Q110 is conducted, the potential of the pin 1 of the U42 main control chip is pulled down, the U42 stops sending waves to enter an intermittent mode, whether the short circuit disappears is detected by intermittent beating of the U42 every fixed time, and if the short circuit is recovered, the intermittent mode is exited; otherwise, the device is always in an intermittent mode, and continuously detects whether the short circuit disappears.
The invention has simple circuit, high efficiency and reliability, and can be applied to isolated charging and starting of the bus capacitor group when a single power grid starts in high-frequency power electronic products such as a photovoltaic inverter, an uninterruptible power supply and the like.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (8)
1. The utility model provides a circuit is got in energy storage dc-to-ac converter electric wire netting side high frequency isolation which characterized in that: the soft start circuit comprises a main circuit, a feedback circuit connected with the main circuit, a soft start and protection circuit and an auxiliary source circuit;
the main circuit comprises a resistor R682, a capacitor C439 and a main control chip, wherein the positive input end of a power grid is respectively connected with one end of the resistor R682 and one end of the capacitor C439, the other end of the resistor R682 is respectively connected with one end of a capacitor C433, one end of a resistor R683, one end of the capacitor C443 and a transformer T10 pin 1, the other end of the resistor R682 is respectively connected with the D pole of a MOS tube Q109 through a resistor R10, a resistor R12 and a resistor R11, the other end of the resistor R682 is connected with the negative end of a diode Z34 through a resistor R678, a resistor R679, a resistor R680, a resistor R684, a resistor 690 and a resistor R691, the positive end of the diode Z34 is respectively connected with the negative end of a diode Z35, one end of a resistor R677, the G pole of the MOS tube Q109 and a port ON/OFF2, the S pole of the MOS tube Q109 is connected with the positive end of a diode D110, the negative end of the diode D110 is respectively connected with one end of the capacitor C67, one end of the capacitor C446, the main control chip 7 and the port VCC2, the other end of the capacitor C682, the other end of the capacitor C433, the other end of the capacitor C446, the positive end of the capacitor C35, the capacitor C7 and the other end of the capacitor C3 and the other end of the transformer C434 are respectively connected with the other end of the capacitor C1;
the master chip pin 1 is respectively connected with a pin 4 of the optical coupler OT4, one end of a resistor R658, one end of a capacitor C444 and a port COMP2, the master chip pin 3 is respectively connected with one end of a capacitor C442 and one end of a resistor R685, the other end of the resistor R685 is respectively connected with one end of a resistor R676, one end of an S pole of a MOS transistor Q114 and one end of a resistor R16, the other end of the resistor R16 is connected with one end of a resistor R15, the pin 3 of the optical coupler OT4, the other end of the resistor R658, the other end of the capacitor C444, the master chip pin 2, the other end of the capacitor C442 and the other end of the resistor R15 are respectively connected with a negative input end of a power grid, the master chip pin 4 is respectively connected with one end of a capacitor C436 and one end of a resistor R657, the other end of the resistor R657 is respectively connected with one end of a capacitor C435, one end of a master chip pin 8 and the port 2, the other end of the capacitor C435 is respectively connected with the other end of a capacitor C436, the other end of a master chip pin 5 and the other end of a power grid negative input end of a resistor R16, the master chip 6 is respectively connected with one end of a diode D673 and one end of a resistor R674, the other end of a positive end of a diode D6764 and the other end of a resistor D114 and the other end of a resistor R118 are respectively, and the other end of a resistor R3 and the other end of a resistor D114 are respectively connected with the resistor D12 and the other end of a resistor 3 and the resistor is respectively;
the transformer T10 pin 8 is respectively connected with one end of a resistor R14 and one end of a capacitor C448, the other end of the resistor R14 is connected with the negative end of a voltage output end, the transformer T10 pin 11 is connected with the positive end of a diode D1, the negative end of the diode D1 is connected with the positive end of a diode D2, the negative end of the diode D2 is respectively connected with the other end of the capacitor C448 and one end of a resistor R13, the other end of the resistor R13 is connected with the positive end of the voltage output end, and the transformer T10 pins 8 and 11 correspond to one coil;
the soft start and protection circuit comprises an integrated circuit U44, a resistor R6 is connected to a port COMP2, the other end of the resistor R6 is connected with a pin 1 of the integrated circuit U44, one end of a resistor R5 and one end of a capacitor C441 respectively, a pin 3 of the integrated circuit U44 is connected with one end of a resistor R4, one end of the resistor R3 is connected to a port VCC2, the other end of the resistor R2 is connected with an E pole of a triode Q113, the other end of the resistor R3 is connected with the other end of the resistor R4 respectively, the B pole of the triode Q113 is connected with one end of a capacitor C440, one end of a resistor R667 and the G pole of a MOS transistor Q112 respectively, the D pole of the MOS transistor Q112 is connected with the negative end of a diode D115 respectively, the S pole of the MOS transistor Q112, the other end of the resistor R667, the other end of the capacitor C440, the pin 2 of the integrated circuit U44, the other end of the resistor R5 and the other end of the capacitor C441 are connected with a negative end of the power grid, the C pole of the triode Q113 is connected with the positive end of the diode C1, the negative end of the diode Q116 is connected with the negative end of the diode C1, the negative end of the diode C1 is connected with the negative end of the diode C110, and the negative end of the diode 110 is connected with the negative end of the diode 110 respectively.
2. The power grid-side high-frequency isolation power taking circuit of an energy storage inverter according to claim 1, wherein: the resistor R10, the resistor R11 and the resistor R12 are current limiting resistors.
3. The power grid-side high-frequency isolation power taking circuit of an energy storage inverter according to claim 1, wherein: the diode Z34 and the diode Z35 are zener diodes.
4. The power grid-side high-frequency isolation power taking circuit of an energy storage inverter according to claim 1, wherein: the transformer T10 is a high-frequency transformer.
5. The power grid-side high-frequency isolation power taking circuit of an energy storage inverter according to claim 1, wherein: the capacitor C439 and the capacitor C446 are polar capacitors, and the capacitor C433 and the capacitor C443 are nonpolar capacitors.
6. The power grid-side high-frequency isolation power taking circuit of an energy storage inverter according to claim 1, wherein: the feedback circuit comprises an integrated circuit U43, a pin 1 of an optical coupler OT4 is respectively connected with one end of a resistor R659, one end of a capacitor C437 and one end of a resistor R660, the other end of the resistor R659 and the other end of the capacitor C437 are both connected with one end of the resistor R9, the other end of the resistor R9 is connected with an output voltage sampling feedback positive end through a resistor R8, a pin 2 of the optical coupler OT4 is respectively connected with one end of a resistor R661, a pin 3 of the integrated circuit U43 and the other end of the resistor R660, the other end of the capacitor C438 is respectively connected with one end of the integrated circuit U43, one end of the resistor R7 and one end of the resistor R663, the other end of the resistor R663 and the pin 2 of the integrated circuit U43 are both connected with an output voltage sampling feedback negative end, the output voltage sampling feedback positive end is connected with the negative end of the resistor R664, the resistor R662, the resistor R484 and the resistor R665, the output voltage sampling feedback positive end is connected with the junction of the diode D2, the junction point of the negative end of the resistor R13 and the capacitor C43 and the junction point of the capacitor C431, and the junction point of the capacitor C448 and the junction point of the capacitor C10 are connected with the junction point of the capacitor C448 and the junction point of the capacitor C10.
7. The power grid-side high-frequency isolation power taking circuit of an energy storage inverter according to claim 1, wherein: the auxiliary source circuit comprises an integrated circuit U45, a transformer T10 pin 5 is respectively connected with one end of a capacitor C452, one end of a capacitor C451, a transformer T10 pin 2 and a power grid negative input end, a transformer T10 pin 6 is connected with a diode D119 positive end, a diode D119 negative end is respectively connected with the other end of the capacitor C452, the other end of the capacitor C451 and the integrated circuit U45 pin 1, the integrated circuit U45 pin 3 is connected with a port VCC2 through a resistor R703, the transformer T10 pins 5 and 6 correspond to one coil, and the U45 is a voltage stabilizing chip 7815.
8. The power grid-side high-frequency isolation power taking circuit of an energy storage inverter according to claim 1, wherein: the grid alternating current is input to a positive input end and a negative input end of the grid after rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310869629.9A CN116599237B (en) | 2023-07-17 | 2023-07-17 | High-frequency isolation circuit for power grid side of energy storage inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310869629.9A CN116599237B (en) | 2023-07-17 | 2023-07-17 | High-frequency isolation circuit for power grid side of energy storage inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116599237A CN116599237A (en) | 2023-08-15 |
| CN116599237B true CN116599237B (en) | 2023-10-17 |
Family
ID=87608283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310869629.9A Active CN116599237B (en) | 2023-07-17 | 2023-07-17 | High-frequency isolation circuit for power grid side of energy storage inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116599237B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624086A (en) * | 2012-03-28 | 2012-08-01 | 广东易事特电源股份有限公司 | Night-off type alternating-current power grid power-taking photovoltaic inverter |
| CN203537235U (en) * | 2013-10-12 | 2014-04-09 | 北京索英电气技术有限公司 | High frequency isolated type high voltage DC power taking supply unit |
| CN205178905U (en) * | 2015-12-18 | 2016-04-20 | 吉林工业职业技术学院 | Adjustable constant voltage power supply of intelligence |
| CN106410981A (en) * | 2016-12-08 | 2017-02-15 | 天津市百利纽泰克电气科技有限公司 | Busbar electricity getting circuit of high-voltage side of current transformer |
| CN109888935A (en) * | 2019-03-11 | 2019-06-14 | 南华大学 | A kind of power grid isolation electricity-fetching method and circuit |
| CN209913488U (en) * | 2019-04-30 | 2020-01-07 | 深圳市振华微电子有限公司 | Short-circuit protection circuit and soft start circuit based on pulse width modulator |
| CN110676883A (en) * | 2019-11-07 | 2020-01-10 | 哈尔滨理工大学 | Novel inversion grid-connected device with digital-analog combined control |
| WO2022041045A1 (en) * | 2020-08-26 | 2022-03-03 | 南京龙渊众创信息科技股份有限公司 | Anti-static protection system for internet of things communication and protection method |
| WO2022121305A1 (en) * | 2020-12-10 | 2022-06-16 | 珠海格力电器股份有限公司 | Soft start circuit and power supply circuit |
-
2023
- 2023-07-17 CN CN202310869629.9A patent/CN116599237B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624086A (en) * | 2012-03-28 | 2012-08-01 | 广东易事特电源股份有限公司 | Night-off type alternating-current power grid power-taking photovoltaic inverter |
| CN203537235U (en) * | 2013-10-12 | 2014-04-09 | 北京索英电气技术有限公司 | High frequency isolated type high voltage DC power taking supply unit |
| CN205178905U (en) * | 2015-12-18 | 2016-04-20 | 吉林工业职业技术学院 | Adjustable constant voltage power supply of intelligence |
| CN106410981A (en) * | 2016-12-08 | 2017-02-15 | 天津市百利纽泰克电气科技有限公司 | Busbar electricity getting circuit of high-voltage side of current transformer |
| CN109888935A (en) * | 2019-03-11 | 2019-06-14 | 南华大学 | A kind of power grid isolation electricity-fetching method and circuit |
| CN209913488U (en) * | 2019-04-30 | 2020-01-07 | 深圳市振华微电子有限公司 | Short-circuit protection circuit and soft start circuit based on pulse width modulator |
| CN110676883A (en) * | 2019-11-07 | 2020-01-10 | 哈尔滨理工大学 | Novel inversion grid-connected device with digital-analog combined control |
| WO2022041045A1 (en) * | 2020-08-26 | 2022-03-03 | 南京龙渊众创信息科技股份有限公司 | Anti-static protection system for internet of things communication and protection method |
| WO2022121305A1 (en) * | 2020-12-10 | 2022-06-16 | 珠海格力电器股份有限公司 | Soft start circuit and power supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116599237A (en) | 2023-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018107623A1 (en) | Pfc dual-full-bridge-based smart sine wave voltage conversion circuit | |
| CN103326325B (en) | Switching Power Supply output short-circuit and under-voltage protecting circuit | |
| CN102263515B (en) | AC-DC (alternating current-direct current) power conversion chip and power conversion circuit | |
| WO2018120483A1 (en) | Pfc interleaved flyback full bridge based intelligent sine-wave voltage conversion circuit | |
| WO2018107621A1 (en) | Smart sine wave voltage conversion circuit based on pfc flyback full bridge | |
| WO2020007171A1 (en) | Compound isolation type led emergency lamp control circuit | |
| CN108173243B (en) | Inverter leakage protection circuit and inverter | |
| CN109600046A (en) | Failure automatically switches DC-DC converter | |
| WO2018107622A1 (en) | Pfc double full bridge-based smart correction wave voltage conversion circuit | |
| WO2018126555A1 (en) | Smart sine wave voltage conversion circuit based on pfc, full bridge and half bridge | |
| CN109149730B (en) | Energy storage type inversion mobile power supply and working method thereof | |
| CN114204643A (en) | Intelligent quick charging source | |
| KR20160120611A (en) | Intergrated type motor driving circuit | |
| CN116599237B (en) | High-frequency isolation circuit for power grid side of energy storage inverter | |
| CN113829940A (en) | NB-IOT-based intelligent electric bicycle charging system and working method thereof | |
| CN104426377B (en) | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor | |
| CN202178715U (en) | AC-DC power conversion chip and power conversion circuit | |
| WO2018126556A1 (en) | Intelligent half-bridge correction wave voltage conversion circuit based on pfc and llc resonances | |
| CN105490554B (en) | A kind of variable-frequency power sources | |
| CN210867264U (en) | Power supply circuit of emergency lighting lamp | |
| CN209217955U (en) | A kind of DC power supply self-start circuit of high voltage input and low-voltage output | |
| CN203312774U (en) | Short-circuit and low-voltage protective circuit of output of switching power source | |
| CN210867530U (en) | Power module for taking energy from output end of frequency converter and motor protection device | |
| CN214177155U (en) | Circuit for quickly starting high-voltage PWM chip | |
| CN102969910A (en) | Switching power supply control chip and application circuit thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |