CN218124387U - Compatible power supply circuit - Google Patents
Compatible power supply circuit Download PDFInfo
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- CN218124387U CN218124387U CN202222326278.0U CN202222326278U CN218124387U CN 218124387 U CN218124387 U CN 218124387U CN 202222326278 U CN202222326278 U CN 202222326278U CN 218124387 U CN218124387 U CN 218124387U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model provides a compatible supply circuit, include: an auxiliary power supply 110 including a first input port and a second input port, a first capacitor being disposed between the first input port and the second input port, the second input port being grounded; a first photovoltaic output port of the photovoltaic power supply unit 120 is connected to the first input port through the unidirectional conduction unit 140, a second photovoltaic output port of the photovoltaic power supply unit 120 is grounded, and the conduction direction of the unidirectional conduction unit 140 is the same as the flow direction of the current output by the photovoltaic power supply unit 120; the grid power supply unit 130 is configured to convert ac power at a grid side into dc power, a first grid output port of the grid power supply unit 130 is connected to the first input port, and a second grid output port of the grid power supply unit 130 is grounded. The utility model provides an embodiment can compatible photovoltaic direct current side and electric wire netting ac side be the auxiliary power source power supply, improve the reliable degree for the auxiliary power source power supply effectively, improve user's use and experience.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a compatible supply circuit.
Background
The auxiliary power supply of the photovoltaic inverter is an MCU (microprogrammed control Unit), and loads such as a driving loop and the like provide power supplies, so that the photovoltaic inverter plays a role in lifting the weight. In the related art, under the condition that a consumer does not prepare an energy storage battery, an auxiliary power supply of a household photovoltaic inverter product generally only takes power from a direct current bus side or only takes power from a power grid alternating current side. Under the condition that the auxiliary power supply only takes power from the direct current bus side, the auxiliary power supply cannot take power normally when the illumination intensity is weak; under the condition that the auxiliary power supply only takes power from the alternating current side of the power grid, the auxiliary power supply cannot take power normally when the power grid is in power failure. When getting the electric point and breaking down promptly, can cause great influence to auxiliary power source's the work of getting electricity, and then influence photovoltaic inverter and can't start normal work, influence user experience.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent.
Therefore, the utility model provides a compatible supply circuit can compatible photovoltaic direct current side and electric wire netting alternating current side be the auxiliary power source power supply, improve the reliable degree for the auxiliary power source power supply effectively, improve user's use and experience.
In a first aspect, an embodiment of the present invention provides a compatible power supply circuit, including: the auxiliary power supply comprises a first input port and a second input port, a first capacitor is arranged between the first input port and the second input port, and the second input port is grounded; a first photovoltaic output port of the photovoltaic power supply unit is connected with the first input port through a one-way conduction unit, a second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with the flow direction of current output by the photovoltaic power supply unit; and the power grid power supply unit is used for converting alternating current on the power grid side into direct current, a first power grid output port of the power grid power supply unit is connected with the first input port, and a second power grid output port of the power grid power supply unit is grounded.
According to the utility model discloses compatible supply circuit that the embodiment of first aspect provided has following beneficial effect at least: the auxiliary power supply comprises a first input port and a second input port, a first capacitor is arranged between the first input port and the second input port, and the second input port is grounded; a first photovoltaic output port of the photovoltaic power supply unit is connected with a first input port through a one-way conduction unit, a second photovoltaic output port of the photovoltaic power supply unit is grounded, the conduction direction of the one-way conduction unit is consistent with the flow direction of current output by the photovoltaic power supply unit, the photovoltaic power supply unit outputs photovoltaic power supply current through the first photovoltaic output port, and the first photovoltaic output port has a first potential; the power grid power supply unit converts alternating current on the power grid side into direct current, a first power grid output port of the power grid power supply unit is connected with the first input port, a second power grid output port of the power grid power supply unit is grounded, the direct current is output from the first power grid output port, and the first power grid output port has a second potential; under the condition that the first potential is higher than the second potential, the one-way conduction unit is in a conduction state, photovoltaic power supply current output by the photovoltaic power supply unit charges the first capacitor after passing through the one-way conduction unit, and provides electric energy for the auxiliary power supply after passing through the smoothing filtering action of the first capacitor; under the condition that the second potential is higher than the first potential, the one-way conduction unit is in a cut-off state, the power grid power supply unit outputs direct current through the first power grid output port, the direct current charges a first capacitor arranged between the first input port and the second input port of the auxiliary power supply, and electric energy is provided for the auxiliary power supply after the smoothing filtering effect of the first capacitor. Under the condition that grid power supply unit, photovoltaic power supply unit one of them broke down for another power supply unit still can normally work and for auxiliary power supply, has ensured auxiliary power supply's normal work effectively, that is to say, through the embodiment of the utility model provides a, can compatible photovoltaic direct current side and grid alternating current side be auxiliary power supply, improve the reliable degree for auxiliary power supply effectively, improve user's use and experience.
According to some embodiments of the present invention, the first photovoltaic output port and the second photovoltaic output port are connected with a second capacitor therebetween.
According to some embodiments of the utility model, the one-way conduction unit includes anodal and negative pole, the negative pole with first input port connects, anodal with first photovoltaic output port connects, and the electric current is followed under the on-state anodal flow direction the negative pole.
According to some embodiments of the present invention, the first grid output port and the one-way conduction unit are connected with a second thermistor whose resistance increases with the increase of temperature between the positive electrodes.
According to the utility model discloses a some embodiments, first electric wire netting output port with the unidirectional flux unit still be connected with between the positive pole with the current-limiting resistor that second thermistor establishes ties.
According to the utility model discloses a some embodiments, first electric wire netting output port with the unidirectional flux unit be connected with the first thermistor that the resistance reduces along with temperature rise between the negative pole.
According to the utility model discloses a some embodiments, electric wire netting power supply unit includes first filtering module, second filtering module and rectifier module, the second filtering input port of second filtering module with the first filtering output port of first filtering module is connected, the second filtering output port of second filtering module with rectifier module's rectification input port connects.
According to some embodiments of the utility model, the electric wire netting power supply unit still including set up in first filtering output port with switch unit between the second filtering input port.
According to the utility model discloses a some embodiments, photovoltaic power supply unit is including the unit and the direct current generating line that step up, the output port that steps up of the unit is connected with the direct current generating line, the direct current generating line includes first photovoltaic output port with second photovoltaic output port.
According to the utility model discloses a some embodiments, compatible supply circuit still includes: the battery power supply unit comprises a first battery output port and a second battery output port, the first battery output port is connected with the first photovoltaic output port, and the second battery output port is grounded.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the present invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the present invention for explaining the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
Fig. 1 is a schematic structural diagram of a compatible power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a compatible power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a compatible power supply circuit according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the description of the present invention, unless there is an explicit limitation, the words such as setting and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
The auxiliary power supply is a core component of the household photovoltaic inverter and can provide power for key functional modules of an MCU, a driving loop, a detection loop, a control loop and the like of the photovoltaic inverter. At present, most auxiliary power supplies of photovoltaic inverters generally take electricity from the alternating current side of a power grid or from the direct current bus side, and the electricity taking mode of the auxiliary power supplies is single. The single power-taking mode has a plurality of problems. For example, when the auxiliary power supply only takes power from the ac side of the power grid, the auxiliary power supply cannot work normally when the power supply of the ac side of the power grid fails, such as when the power grid fails; when the auxiliary power supply only gets electricity from the direct current bus side, when the power supply of the direct current bus side fails, if the photovoltaic power generation assembly is damaged and the outdoor illumination condition is not good, the auxiliary power supply cannot normally work, and then the photovoltaic inverter cannot normally operate. Based on this, the utility model provides a compatible supply circuit can be under the condition that one of them breaks down of electric wire netting power supply unit, photovoltaic power supply unit, and another power supply unit still can normally work and for the auxiliary power supply, has ensured auxiliary power supply's normal work effectively, promptly, through the embodiment of the utility model discloses, can compatible photovoltaic direct current side and electric wire netting alternating current side be the auxiliary power supply, improve the reliable degree for the auxiliary power supply effectively, improve user's use and experience.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1 to 2, an embodiment of the present invention provides a compatible power supply circuit 100, including: an auxiliary power supply 110 including a first input port and a second input port, a first capacitor 101 being disposed between the first input port and the second input port, the second input port being grounded; a first photovoltaic output port of the photovoltaic power supply unit 120 is connected with the first input port through the unidirectional conduction unit 140, a second photovoltaic output port of the photovoltaic power supply unit 120 is grounded, and the conduction direction of the unidirectional conduction unit 140 is consistent with the flow direction of the current output by the photovoltaic power supply unit 120; the power grid supply unit 130 is configured to convert ac power at a power grid side into dc power, a first power grid output port of the power grid supply unit 130 is connected to the first input port, and a second power grid output port of the power grid supply unit 130 is grounded.
According to the compatible power supply circuit 100 provided by the embodiment of the present invention, the auxiliary power supply 110 includes a first input port and a second input port, a first capacitor 101 is disposed between the first input port and the second input port, and the second input port is grounded; a first photovoltaic output port of the photovoltaic power supply unit 120 is connected with the first input port through the unidirectional conduction unit 140, a second photovoltaic output port of the photovoltaic power supply unit 120 is grounded, the conduction direction of the unidirectional conduction unit 140 is consistent with the flow direction of the current output by the photovoltaic power supply unit 120, the photovoltaic power supply unit 120 outputs the photovoltaic power supply current through the first photovoltaic output port, and the first photovoltaic output port has a first potential; the power grid power supply unit 130 converts alternating current on the power grid side into direct current, a first power grid output port of the power grid power supply unit 130 is connected with the first input port, a second power grid output port of the power grid power supply unit 130 is grounded, the direct current is output from the first power grid output port, and the first power grid output port has a second potential; under the condition that the first potential is higher than the second potential, the unidirectional conduction unit 140 is in a conduction state, the photovoltaic power supply current output by the photovoltaic power supply unit 120 charges the first capacitor 101 after passing through the unidirectional conduction unit 140, and provides electric energy for the auxiliary power supply 110 after passing through the smoothing filtering function of the first capacitor 101; when the second potential is higher than the first potential, the unidirectional conducting unit 140 is in an off state, the grid power supply unit 130 outputs a direct current through the first grid output port, the direct current charges the first capacitor 101 disposed between the first input port and the second input port of the auxiliary power supply 110, and the electric energy is provided to the auxiliary power supply 110 after the smoothing filtering action of the first capacitor 101. Under the condition that electric wire netting power supply unit 130, photovoltaic power supply unit 120 one of them breaks down for another power supply unit still can normally work and supply power for auxiliary power source 110, has ensured auxiliary power source 110's normal work effectively, promptly, through the embodiment of the utility model discloses, can compatible photovoltaic direct current side and electric wire netting alternating current side are auxiliary power source 110 power supply, improve the reliable degree for auxiliary power source 110 power supply effectively, improve user's use and experience. Specifically, the first potential is DC +, and the second potential is P +.
Specifically, under the condition that a user does not equip the photovoltaic inverter with an energy storage battery, before the photovoltaic inverter does not work, the grid power supply unit 130 converts the commercial power on the ac side of the grid into direct current, at this time, the second potential is higher than the first potential, the unidirectional conducting unit 140 is in a cut-off state, that is, the branch where the unidirectional conducting unit 140 is located is open-circuited, the grid power supply unit 130 charges the first capacitor 101, and after smoothing and filtering of the first capacitor 101, electric energy is provided for the auxiliary power supply 110. The auxiliary power supply 110 provides power for key functional modules of the photovoltaic inverter, such as an MCU, a driving loop, a detection loop, a control loop, and the like, so that the photovoltaic inverter operates normally.
In practical application, the photovoltaic power generation is greatly influenced by the environment, and the situation that the photovoltaic power generation assembly is damaged and cannot generate power or the photovoltaic power generation unit cannot generate power due to weak illumination intensity under the influence of weather possibly exists, so that the photovoltaic power generation unit cannot normally work. When the photovoltaic power supply unit 120 fails and normal power supply is not available, and the grid power supply unit 130 works normally, at this time, the second potential is higher than the first potential, the unidirectional conducting unit 140 is in a cut-off state, that is, the branch where the unidirectional conducting unit 140 is located is disconnected, the grid power supply unit 130 charges the first capacitor 101, and after smoothing and filtering of the first capacitor 101, electric energy is provided for the auxiliary power supply 110. The auxiliary power source 110 provides electric power to the photovoltaic inverter, so that the photovoltaic inverter operates normally.
In practical applications, there may be a power failure during an electric peak period or a power transmission abnormality caused by damage to a power transmission line, so that the grid power supply unit 130 may not work normally. When the grid power supply unit 130 fails and normal power supply is not available, and the photovoltaic power supply unit 120 works normally, at this time, the first potential is higher than the second potential, the unidirectional conduction unit 140 is in a conduction state, that is, the branch where the unidirectional conduction unit 140 is located is a path, the photovoltaic power supply current output by the photovoltaic power supply unit 120 charges the first capacitor 101 after passing through the unidirectional conduction unit 140, and provides electric energy for the auxiliary power supply 110 after passing through the smoothing filtering function of the first capacitor 101. The auxiliary power source 110 provides electric energy for the photovoltaic inverter, so that the photovoltaic inverter can normally operate and can be connected to the grid to transmit the electric energy to the power grid.
When both the grid power supply unit 130 and the photovoltaic power supply unit 120 can supply power normally, under the condition that the first potential is higher than the second potential, the unidirectional conduction unit 140 is in a conduction state, and the photovoltaic power supply unit 120 provides electric energy for the auxiliary power supply 110; in the case that the second potential is higher than the first potential, the unidirectional conducting unit 140 is in an off state, and the auxiliary power supply 110 is provided with electric energy by the grid power supply unit 130. In an embodiment, when the first potential is lower than the second potential, the grid power supply unit 130 provides electric energy to the auxiliary power supply 110, the photovoltaic power supply current gradually increases with the increase of illumination, the first potential gradually increases, and when the first potential is higher than the second potential, the one-way conduction unit 140 is switched from the off state to the on state, and the compatible power supply circuit 100 automatically switches to supply power to the auxiliary power supply 110 by the photovoltaic power supply unit 120. The utility model provides a compatible supply circuit 100's implementation is more economical, the realization of being convenient for.
Those skilled in the art will appreciate that the compatible power supply circuit 100 shown in fig. 1 does not constitute a limitation on embodiments of the invention, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
It should be noted that the present invention is substantially an improvement in the composition and connection relationship of hardware components, and does not involve an improvement in the software program itself.
As shown in fig. 1, according to some embodiments of the present invention, the one-way conduction unit 140 includes a positive electrode and a negative electrode, the negative electrode is connected to the first input port, the positive electrode is connected to the first photovoltaic output port, and the current flows from the positive electrode to the negative electrode in the conduction state.
The unidirectional conduction unit 140 has a unidirectional conduction characteristic, a negative electrode of the unidirectional conduction unit 140 is connected with the first input port and the first power grid output port, the first power grid output port has the second potential, the first photovoltaic output port has the first potential, and under the action of the first potential and the second potential, the unidirectional conduction unit 140 can be switched between a conduction state and a cut-off state, so that a power supply mode is switched between power supply of the photovoltaic power supply unit 120 and power supply of the power grid power supply unit 130. The photovoltaic direct current side and the power grid alternating current side are compatible to supply power to the auxiliary power supply 110, the reliability of supplying power to the auxiliary power supply 110 is effectively improved, and the use experience of a user is improved.
Specifically, the unidirectional conducting unit 140 is a diode. It should be noted that the unidirectional conducting unit 140 may also adopt an IGBT (Insulated Gate Bipolar Transistor) or a MOS Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor). Therefore, the present invention is not limited to the implementation manner of the unidirectional conducting unit 140.
According to the utility model discloses a some embodiments, electric wire netting power supply unit 130 includes first filtering module 131, second filtering module 132 and rectifier module 133, and the second filtering input port of second filtering module 132 is connected with the first filtering output port of first filtering module 131, and the second filtering output port of second filtering module 132 is connected with rectifier module 133's rectification input port.
Specifically, the first filtering module 131 employs an Electromagnetic Interference (EMI) filtering circuit, and the EMI filtering circuit can filter Interference of high-frequency pulses of an external power grid to the power supply. In addition, the EMI filter circuit mainly comprises an X capacitor and a Y capacitor, wherein the X capacitor and the Y capacitor both belong to safety capacitors, the X capacitor is connected in parallel between a live wire and a zero wire, and a block head is usually large and is responsible for filtering differential mode interference; the Y capacitor is a capacitor connected in parallel between the live wire and the ground wire and between the zero wire and the ground wire, usually appears in pairs and is responsible for filtering common-mode interference, and the EMI filter circuit further comprises a common-mode inductor which can enhance the filtering effect. The commercial power is filtered by the EMI filter circuit and then input to the second filter module 132. The second filtering module 132 employs an RC filtering circuit, which can remove high frequency interference. The rectifying module 133 adopts a bridge rectifying circuit, which includes four rectifying diodes, which are respectively: the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, alternating current output direct current pulsating voltage after bridge rectifier circuit rectification for first electric wire netting output port has the second electric potential. The first capacitor 101 can smooth the rectified current, and provides a relatively stable power supply for the auxiliary power supply 110 when the first photovoltaic output port has a first potential lower than a second potential.
Referring to fig. 1 and 2, according to some embodiments of the present invention, a first thermistor 102 having a resistance value decreasing with a temperature increase is connected between the first grid output port and the negative electrode of the unidirectional conducting unit 140.
Specifically, the first thermistor 102 is an NTC (Negative Temperature Coefficient) thermistor. In the rectifier filter circuit, the capacitive load charging at the moment when the electronic circuit starts to operate can generate surge current, and the power supply is damaged. The NTC thermistor can function as an inrush current prevention and protect the auxiliary power supply 110. After the NTC thermistor finishes the work of resisting the surge current, the current continuously acts on the NTC thermistor, the resistance value of the NTC thermistor is reduced to a very small value along with the rise of the temperature, the consumed power is very small and can be basically ignored, and the normal work of the circuit cannot be influenced.
Referring to fig. 3, according to some embodiments of the present invention, the grid power supply unit 130 further includes a switch unit 105 disposed between the first filter output port and the second filter input port.
The photovoltaic module converts light energy into direct current, and the photovoltaic inverter inverts the direct current output by the photovoltaic module into alternating current, so that the alternating current can be incorporated into a power grid or a power supply device and equipment for use. The insulation characteristic of the photovoltaic system is a key factor for evaluating the safety performance, and under the condition of insulation failure, the insulation performance of the photovoltaic system is easily damaged by people and is indirectly reduced. Therefore, the photovoltaic inverter must detect the magnitude of the insulation resistance of the positive and negative electrodes of the photovoltaic system to the ground, that is, the photovoltaic inverter needs to perform insulation resistance detection. It can be understood that, when using the compatible power supply circuit 100 provided by the embodiment of the present invention, the impedance of the zero line and the live line of the ac input power source to the ground may affect the detection of the insulation resistance, so that the detection result is not accurate. Therefore, a switch unit 105 is disposed between the first filter output port and the second filter input port of the grid power supply unit 130, and the switch unit 105 is normally closed in a normal operating state. When the insulation resistance of the photovoltaic system needs to be detected, the switch unit 105 is disconnected, namely, the zero line and the live line of the alternating current input power supply on the alternating current side of the power grid are disconnected, and the accuracy of the insulation resistance detection is improved.
Specifically, the switching unit 105 employs a relay. It will be understood by those skilled in the art that when the switch unit 105 is a relay, it may be a normally closed double-pole single-throw relay or a double-pole double-throw relay, may be a normally closed double-pole solid-state relay, or may be a combination of two normally closed single-pole single-throw relays or a single-pole double-throw relay. In addition, the switching unit 105 may be a digital switching circuit or an analog switching circuit. Therefore, the present invention is not limited to the implementation of the switch unit 105.
As shown in fig. 2, according to some embodiments of the present invention, the photovoltaic power supply unit 120 includes the voltage boosting unit 12 and the dc bus 124, the voltage boosting output port of the voltage boosting unit 121 is connected to the dc bus 124, and the dc bus 124 includes the first photovoltaic output port and the second photovoltaic output port. A second capacitor 104 is connected between the first photovoltaic output port and the second photovoltaic output port. The second capacitor 104 can act as a smoothing filter for the output current when supplied by the photovoltaic power supply unit 130.
It should be noted that the photovoltaic power supply unit 120 further includes a photovoltaic module 123, and a power generation output port of the photovoltaic module 123 is connected to a boost input port of the boost unit 121. The photovoltaic module 123 is configured to convert optical energy into direct current, the direct current is output from the power generation output port and then input to the voltage boosting unit 121 through the voltage boosting input port of the voltage boosting unit 121, the voltage boosting unit 121 is configured to boost the voltage of the direct current, and the direct current with boosted voltage is output from the voltage boosting output port of the voltage boosting unit 121 to the direct current bus 124.
In the case where both the grid power supply unit 130 and the photovoltaic power supply unit 120 can supply power normally, both the first potential and the second potential are not zero. Under the condition that the second potential is higher than the first potential, the unidirectional conducting unit 140 is in a cut-off state, and at the beginning, the auxiliary power supply 110 gets power from the power grid power supply unit 130, and then the auxiliary power supply 110 provides electric energy for the photovoltaic inverter, so that the photovoltaic inverter operates normally. Then, the voltage boosting unit 121 can also work normally, and the first potential is boosted to be higher than the second potential, so that the unidirectional conducting unit 140 is in a conducting state, and the compatible power supply circuit 100 automatically switches to: the auxiliary power supply 110 is powered by the photovoltaic power supply unit 120. In addition, the compatible power supply circuit 100 further includes an inverter unit 122, a boost output port of the boost unit 121 is further connected to an inverter input port of the inverter unit 122, and the inverter unit 122 further includes a grid-connected output port, and the grid-connected output port is used for transmitting electric energy to a power grid. Specifically, the boosting unit 121 is a boost module.
As shown in fig. 2, according to some embodiments of the present invention, a second thermistor 103 with a resistance value increasing with a temperature increase is connected between the first grid output port and the positive electrode of the unidirectional conducting unit 140. A current limiting resistor 106 connected in series with the second thermistor 103 is further connected between the first grid output port and the positive electrode of the unidirectional conducting unit 140.
The second thermistor 103 and the current limiting resistor 106 can limit the current, and play a role in protecting the second capacitor 104. Specifically, under the condition that no energy storage battery is provided, before the photovoltaic inverter does not work, the utility power is divided into two paths of currents after being processed by the first filtering module 131, the second filtering module 132 and the rectifying module 133. One of the currents passes through the first thermistor 102 to supply power to the auxiliary power supply 110. After the other circuit passes through the current limiting action of the second thermistor 103 and the current limiting resistor 106, the second capacitor 104 on the direct current bus 124 is charged, and the current impact of the direct current output by the filtering rectification on the second capacitor 104 is reduced. In addition, when a fault such as a short circuit occurs between the first photovoltaic output port and the second photovoltaic output port of the dc bus 124, the current passing through the second thermistor 103 also increases, and the resistance of the second thermistor 103 increases with the increase of the temperature, and when the resistance of the second thermistor 103 increases to a certain value, the circuit in which it is located is equivalent to an open circuit, and the dc circuit can be protected. Specifically, the second thermistor 103 is a PTC (Positive Temperature Coefficient) thermistor.
As shown in fig. 3, according to some embodiments of the present invention, the compatible power supply circuit 100 further includes: the battery power supply unit 150, the battery power supply unit 150 includes a first battery output port and a second battery output port, the first battery output port is connected with the first photovoltaic output port, and the second battery output port is grounded.
Specifically, the battery power supply unit 150 includes an energy storage battery and a power switch module, wherein a battery output end of the energy storage battery is connected to an input end of the power switch module, an output end of the power switch module is connected to the dc bus 124, and the energy storage battery is used as a load of the dc bus 124 at this time. When the grid power supply unit 130 and the photovoltaic power supply unit 120 cannot work normally to supply power, the energy storage battery can output electric energy to the dc bus 124 through the power switch module, so that the first photovoltaic output port of the dc bus 124 has a first potential. At this time, the first voltage is higher than the second voltage, the unidirectional conducting unit 140 is in a conducting state, and the battery power supply unit 150 supplies power to the auxiliary power supply 110. The power switch module employs a DC/DC converter.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the same is not limited to the embodiments described above, but is intended to cover various modifications and substitutions without departing from the spirit of the present invention.
Claims (10)
1. A compatible power supply circuit, comprising:
the auxiliary power supply comprises a first input port and a second input port, a first capacitor is arranged between the first input port and the second input port, and the second input port is grounded;
a first photovoltaic output port of the photovoltaic power supply unit is connected with the first input port through a one-way conduction unit, a second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with the flow direction of current output by the photovoltaic power supply unit;
and the power grid power supply unit is used for converting alternating current on the power grid side into direct current, a first power grid output port of the power grid power supply unit is connected with the first input port, and a second power grid output port of the power grid power supply unit is grounded.
2. The compatible power supply circuit of claim 1 wherein a second capacitor is connected between the first photovoltaic output port and the second photovoltaic output port.
3. The compatible power supply circuit of claim 1 wherein the unidirectional conducting element comprises a positive pole and a negative pole, the negative pole is connected to the first input port, the positive pole is connected to the first photovoltaic output port, and current flows from the positive pole to the negative pole in a conducting state.
4. The compatible power supply circuit according to claim 3, wherein a second thermistor with a resistance value increasing with the increase of temperature is connected between the first grid output port and the positive electrode of the unidirectional conducting unit.
5. The compatible power supply circuit of claim 4, wherein a current limiting resistor connected in series with the second thermistor is further connected between the first grid output port and the positive electrode of the unidirectional conducting unit.
6. The compatible power supply circuit according to claim 3, wherein a first thermistor with a resistance value decreasing with temperature increase is connected between the first grid output port and the negative electrode of the unidirectional conducting unit.
7. The compatible power supply circuit of claim 1, wherein the grid power supply unit comprises a first filter module, a second filter module and a rectifier module, a second filter input port of the second filter module is connected with a first filter output port of the first filter module, and a second filter output port of the second filter module is connected with a rectifier input port of the rectifier module.
8. The compatible power supply circuit of claim 7 wherein the grid supply unit further comprises a switching unit disposed between the first filter output port and the second filter input port.
9. The compatible power supply circuit of claim 1, wherein the photovoltaic power supply unit comprises a boost unit and a dc bus, the dc bus is connected to a boost output port of the boost unit, and the dc bus comprises the first photovoltaic output port and the second photovoltaic output port.
10. The compatible power supply circuit of any of claims 1 to 9, further comprising: the battery power supply unit comprises a first battery output port and a second battery output port, the first battery output port is connected with the first photovoltaic output port, and the second battery output port is grounded.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222326278.0U CN218124387U (en) | 2022-08-31 | 2022-08-31 | Compatible power supply circuit |
| PCT/CN2022/134384 WO2024045370A1 (en) | 2022-08-31 | 2022-11-25 | Compatible power supply circuit and control method therefor, and controller and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222326278.0U CN218124387U (en) | 2022-08-31 | 2022-08-31 | Compatible power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218124387U true CN218124387U (en) | 2022-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222326278.0U Active CN218124387U (en) | 2022-08-31 | 2022-08-31 | Compatible power supply circuit |
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| Country | Link |
|---|---|
| CN (1) | CN218124387U (en) |
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