CN119231612A - Power supply circuits and electrical equipment - Google Patents
Power supply circuits and electrical equipment Download PDFInfo
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- CN119231612A CN119231612A CN202310796678.4A CN202310796678A CN119231612A CN 119231612 A CN119231612 A CN 119231612A CN 202310796678 A CN202310796678 A CN 202310796678A CN 119231612 A CN119231612 A CN 119231612A
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- 238000010248 power generation Methods 0.000 claims abstract description 113
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000005070 sampling Methods 0.000 claims description 28
- 238000002955 isolation Methods 0.000 claims description 26
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
Classifications
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- 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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/006—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The application belongs to the technical field of power generation, and particularly relates to a power supply circuit and electric equipment. The application aims to solve the problem of poor safety of the existing power supply circuit. The power supply circuit comprises a first switch module, a voltage detection module and a second switch module, wherein the first switch module is connected with the output end of a power generation assembly, the second switch module is connected with the input end of a target power grid, the voltage detection module is connected with a control module of a power generation device, when the power generation assembly does not generate power, the first connection between the power generation assembly and the first switch module is disconnected, the second connection between the target power grid and the second switch module is disconnected, and when the power generation assembly generates power, and the voltage values at two sides of the target power grid detected by the voltage detection module are smaller than a grid-connected voltage threshold value, the control module controls the first switch module to disconnect the first connection and controls the second switch module to conduct the second connection. Through the arrangement, the safety of the power supply circuit is improved.
Description
Technical Field
The application belongs to the technical field of power generation, and particularly relates to a power supply circuit and electric equipment.
Background
The power generation mode of green renewable energy sources such as solar photovoltaic power generation (photovoltaic power generation for short), wind power generation and the like is becoming more and more important. In the case of photovoltaic power generation, when a conventional photovoltaic power generation and supply circuit is used, there is a loss of electric energy (for example, electric energy loss in the dc inversion process on the power generation side and electric energy loss in the ac rectification process on the power utilization side). In order to reduce the power consumption of the power supply circuit, some existing implementations propose a power supply circuit that directly connects the direct current output by the photovoltaic cell assembly in parallel to the consumer of the direct current grid.
However, this existing power supply circuit has a high potential safety hazard.
Disclosure of Invention
In order to solve the problems in the prior art, namely the problems of high potential safety hazards of the existing power supply circuit, the application provides a power supply circuit, a power generation device comprises a power generation assembly and a control module, wherein the power supply circuit comprises a first switch module, a voltage detection module and a second switch module, the first end of the first switch module is connected with the output end of the power generation assembly, the second end of the first switch module and the first end of the second switch module are connected with the first end of the voltage detection module, the third end of the first switch module and the second end of the second switch module are connected with the second end of the voltage detection module, the third end of the second switch module is connected with the input end of a target power grid, the third end of the voltage detection module is connected with the first end of the control module, and the second end of the control module is connected with the fourth end of the first switch module and the fourth end of the second switch module;
when the power generation assembly does not generate power, the first switch module is used for disconnecting a first connection between the power generation assembly and the first switch module, and the second switch module is used for disconnecting a second connection between the target power grid and the second switch module;
The power generation system comprises a power generation assembly, a voltage detection module, a control module and a first switch module, wherein the power generation assembly is used for generating power, the voltage detection module is used for detecting voltage values on two sides of a target power grid and outputting the voltage values to the control module, and the control module is used for controlling the first switch module to disconnect the first connection and controlling the second switch module to conduct the second connection when the voltage values are smaller than a grid-connected voltage threshold.
In the preferable technical scheme of the power supply circuit, the first switch module comprises a first switch and a second switch, wherein the first end of the first switch is connected with the positive electrode of the output end of the power generation assembly, the second end of the first switch is connected with the first end of the voltage detection module, the first end of the second switch is connected with the negative electrode of the output end of the power generation assembly, the second end of the second switch is connected with the second end of the voltage detection module, and the first switch module is disconnected with the first connection and comprises that the first switch and the second switch are disconnected;
And/or the number of the groups of groups,
The second switch module comprises a third switch and a fourth switch, wherein the first end of the third switch is connected with the positive electrode of the input end of the target power grid, the second end of the third switch is connected with the first end of the voltage detection module, the first end of the fourth switch is connected with the negative electrode of the input end of the target power grid, the second end of the fourth switch is connected with the second end of the voltage detection module, the second switch module is disconnected, the third switch and the fourth switch are both disconnected, and the second switch module is connected, the third switch and the fourth switch are both closed.
In the preferred technical scheme of the power supply circuit, the voltage detection module comprises a voltage sampling unit and an isolation unit;
The second end of the first switch module and the first end of the second switch module are both connected with the first end of the voltage sampling unit, and the third end of the first switch module and the second end of the second switch module are both connected with the second end of the voltage sampling unit;
the voltage sampling unit is used for sampling the voltages at the two sides of the target power grid to obtain initial voltages at the two sides of the target power grid;
And the isolation unit is used for isolating the target power grid from the control module when the initial voltage is zero, and determining the voltage values at two sides of the target power grid according to the initial voltage.
In the preferred technical scheme of the power supply circuit, the voltage sampling unit comprises a first resistor, a second resistor and a first amplifying subunit;
The second end of the first switch module and the first end of the second switch module are connected with the first end of the first resistor, the second end of the first resistor and the first end of the second resistor are connected with the first end of the first amplifying subunit, the second end of the first amplifying subunit is connected with the first end of the isolating unit, and the third end of the first switch module and the second end of the second switch module are connected with the second end of the second resistor;
the first amplifying subunit is configured to amplify a voltage obtained by sampling voltages from two sides of the target power grid to obtain the initial voltage.
In the preferred technical scheme of the power supply circuit, the isolation unit comprises a first optocoupler diode, a second optocoupler diode and a third optocoupler diode;
The second end of the first amplifying subunit is connected with the cathode of the first photo-coupling diode, the anode of the first photo-coupling diode is connected with the first output end of the target power grid, the first end of the first amplifying subunit is connected with the cathode of the second photo-coupling diode, the anode of the second photo-coupling diode and the anode of the third photo-coupling diode are grounded, and the cathode of the third photo-coupling diode is connected with the first end of the control module.
In the preferred technical scheme of the power supply circuit, the voltage detection module further comprises a second amplifying unit, wherein the negative electrode of the third photo-coupler diode is connected with the first end of the control module through the second amplifying unit;
And the second amplifying unit is used for amplifying the voltages at two ends of the third optocoupler diode to obtain amplified voltages serving as voltage values at two sides of the target power grid.
In the preferable technical scheme of the power supply circuit, the third end of the first amplifying subunit is connected with the first output end of the target power grid, and the target power grid is used for providing the working voltage of the first amplifying subunit for the first amplifying subunit;
the second amplifying unit is also connected with a third end of the control module, and the control module is used for providing working voltage of the second amplifying unit for the second amplifying unit.
In the preferred technical scheme of the power supply circuit, when the power generation assembly generates power, the control module is further configured to control the first switch module to conduct the first connection and control the second switch module to conduct the second connection when the voltage value is greater than or equal to the grid-connected voltage threshold.
In the preferable technical scheme of the power supply circuit, the power generation assembly is a photovoltaic power generation assembly, the photovoltaic power generation assembly outputs direct current, and the target power grid is a direct current power grid.
In a second aspect, the application provides a powered device comprising a power supply circuit as described in any of the preceding first aspects.
As can be appreciated by those skilled in the art, in the power supply circuit and the electric equipment provided by the application, when the power generation assembly does not generate power, the first connection between the power generation assembly and the first switch module is disconnected, and the second connection between the target power grid and the second switch module is disconnected. Through the power supply circuit, when the power generation assembly does not generate power, no matter whether the target power grid has power or not, the target power grid is physically isolated from the power generation assembly, so that the condition that current still exists in a circuit between the target power grid and the power generation assembly is avoided, and the safety of the power supply circuit is improved. When the power generation assembly generates power, the voltage detection module can detect the voltage values at two sides of the target power grid. When the voltage value is smaller than the grid-connected voltage threshold value, the control module can control the first switch module to disconnect the first connection and control the second switch module to conduct the second connection. Through the power supply circuit, when the target power grid does not have electricity or the voltage cannot reach the grid-connected condition, the power generation assembly is isolated from the target power grid, the problem that the power generation assembly is connected with the target power grid when the target power grid is powered down is avoided, the risk that a user is shocked is further avoided, and the safety of the power supply circuit is improved. The second connection is conducted through controlling the second switch module, so that the control module can continuously judge whether the voltage values at the two sides of the target power grid are smaller than the grid-connected voltage threshold value or not, the voltage at the two sides of the target power grid is continuously monitored, and the safety of the power supply circuit is further improved.
Drawings
Preferred embodiments of the power supply circuit of the present application are described below with reference to the accompanying drawings in conjunction with the power supply circuit. The attached drawings are as follows:
fig. 1 is a schematic structural diagram of a photovoltaic power generation and supply circuit in the prior art;
Fig. 2 is a schematic structural diagram of a power supply circuit according to the present application;
FIG. 3 is a schematic diagram of another power supply circuit according to the present application;
fig. 4 is a schematic structural diagram of a voltage detection module according to the present application;
Fig. 5 is a schematic structural diagram of a voltage sampling unit according to the present application;
FIG. 6 is a schematic diagram of an isolation unit according to the present application;
fig. 7 is a schematic structural diagram of another power supply circuit according to the present application.
Detailed Description
First, it should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. Those skilled in the art can adapt it as desired to suit a particular application.
Further, it should be noted that, in the description of the present application, terms such as "inner", "outer", and the like, refer to directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or components must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
In addition, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or communicating between two members. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.
The power generation mode of green renewable energy sources such as solar photovoltaic power generation (photovoltaic power generation for short), wind power generation and the like is becoming more and more important. Taking photovoltaic power generation as an example, fig. 1 is a schematic structural diagram of a conventional photovoltaic power generation and supply circuit. As shown in fig. 1, in the existing photovoltaic power generation and supply circuit, an inverter and an ac rectifying device are connected between a photovoltaic cell assembly and electric equipment. The inverter can invert the direct current generated and output by the photovoltaic cell assembly and then output the direct current to the alternating current rectifying device at the electricity utilization side, so that the long-distance transmission of electric energy is realized. The alternating current rectifying device can rectify the alternating current output by the inverter into direct current which can be used by electric equipment.
When the existing photovoltaic power generation and supply circuit is used, electric energy has two loss processes, namely a direct current inversion process at the power generation side and an alternating current rectification process at the power utilization side. That is, the existing photovoltaic power generation and supply circuit has a problem of large power loss.
In order to reduce the electric energy loss of the power supply circuit, some existing implementations also propose a method of directly connecting the direct current output by the photovoltaic cell assembly to the electric equipment of the direct current power grid in parallel.
However, when using the existing power supply circuit, if the dc power grid is powered down (e.g., for power down maintenance), the user (e.g., circuit maintenance personnel, etc.) is shocked because the photovoltaic cell assembly is still connected to the dc power grid. When the photovoltaic battery pack does not generate electricity, if the direct current power grid has other power supplies, the circuit between the direct current power grid and the photovoltaic battery pack still has current, and then potential safety hazards exist.
In view of the above problems of the existing power supply circuit, the present application proposes a power supply circuit capable of improving the safety of the power supply circuit without power transmission in the power supply circuit when the power consumption side is powered down or the power generation side is not generating power.
The technical scheme of the application is described in detail below with reference to specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 2 is a schematic structural diagram of a power supply circuit according to the present application. As shown in fig. 2, the power generation device may include a power generation assembly, and a control module. The power supply circuit may include a first switch module, a voltage detection module, and a second switch module. The first end of the first switch module may be connected to the output end of the power generation assembly. The second end of the first switch module and the first end of the second switch module may be connected to the first end of the voltage detection module. The third end of the first switch module and the second end of the second switch module are both connected with the second end of the voltage detection module. The third terminal of the second switching module may be connected with an input terminal of the target grid. The third terminal of the voltage detection module may be connected to the first terminal of the control module. The second end of the control module may be connected to the fourth end of the first switch module and the fourth end of the second switch module.
It should be understood that the present application is not limited to the type of power generation assembly described above. The power generation module may be, for example, a photovoltaic power generation module, or any existing power generation module such as a wind power generation module.
Alternatively, taking the above power generation assembly as a photovoltaic power generation assembly as an example, the output of the photovoltaic power generation assembly may be direct current. The corresponding target power grid may be a direct current power grid. When the target power grid is a direct current power grid, the electric equipment in the direct current power grid can be direct current electric equipment. The dc electric device may be, for example, any electric device such as a water heater, an air conditioner, and the like, which is not limited by the present application. Under the implementation mode, the power generation assembly can be directly connected to two sides of the direct current power grid in parallel, inversion or rectification is not needed, and electric energy loss is reduced.
Or in some embodiments, the target power grid may also be an ac power grid. In this implementation manner, taking the power generation assembly as an example, the power supply circuit may further include an inverter circuit for inverting the direct current into the alternating current, so that the electric device using the alternating current in the target power grid may use the alternating current obtained by the inversion.
By way of example, as shown in FIG. 2, the connection of the first end of the first switch module to the output of the power generation assembly may include, for example, a positive connection in the first end of the first switch module to a positive connection of the output of the power generation assembly. The negative electrode connection end in the first end of the first switch module is connected with the negative electrode of the output end of the power generation assembly.
The connection of the third terminal of the second switching module to the input of the target grid may for example comprise, as shown in fig. 2, that the positive connection of the third terminal of the second switching module to the positive connection of the input of the target grid. The negative electrode connecting end in the third end of the second switch module is connected with the negative electrode of the input end of the target power grid.
In some embodiments, the power generation assembly may also be connected with a control module. The power generation assembly may provide an operating voltage to the control module.
The first switch module may be configured to disconnect the first connection between the power generation assembly and the first switch module when the power generation assembly is not generating power. The second switch module may be used to disconnect a second connection between the target grid and the second switch module.
For example, the power generation assembly provides an operating voltage for the control module, and when the power generation assembly does not generate power, the control module is powered down. After the control module is powered down, the first switch module and the second switch module can be restored to the initial state. The initial state may be that the first connection is disconnected and the second connection is disconnected. By the method, whether the target power grid has electricity or not is realized, and the target power grid is physically disconnected with the power generation assembly and the control module as long as the power generation assembly does not generate power.
When the power generation assembly generates power, the voltage detection module can be used for detecting voltage values on two sides of the target power grid and outputting the voltage values to the control module. The control module may be configured to control the first switch module to disconnect the first connection and control the second switch module to connect the second connection when the voltage value is less than a grid-connected voltage threshold.
It should be understood that the present application is not limited to the number of electric devices included in the target power grid, the kind of electric devices (e.g., air conditioner, water heater, etc.), and the like.
Optionally, if the voltage value is smaller than the grid-connected voltage threshold, it is indicated that the target power grid is not powered or the voltage does not reach the grid-connected condition. Therefore, when the voltage values at the two sides of the target power grid are smaller than the grid-connected voltage threshold, the first switch module is controlled to disconnect the first connection, so that the power generation assembly is isolated from the target power grid, the problem that the power generation assembly is connected with the target power grid when the target power grid is powered down is avoided, the risk that a user is shocked is further avoided, and the safety of the power supply circuit is improved. The second connection is conducted through controlling the second switch module, so that the control module can continuously judge whether the voltage values at the two sides of the target power grid are smaller than the grid-connected voltage threshold value or not, the voltage at the two sides of the target power grid is continuously monitored, and the safety of the power supply circuit is further improved.
The grid-connected voltage threshold may be, for example, stored in the control module in advance.
In this embodiment, when the power generation assembly is not generating power, the first connection between the power generation assembly and the first switch module is disconnected, and the second connection between the target grid and the second switch module is disconnected. Through the power supply circuit, when the power generation assembly does not generate power, no matter whether the target power grid has power or not, the target power grid is physically isolated from the power generation assembly, so that the condition that current still exists in a circuit between the target power grid and the power generation assembly is avoided, and the safety of the power supply circuit is improved. When the power generation assembly generates power, the voltage detection module can detect the voltage values at two sides of the target power grid. When the voltage value is smaller than the grid-connected voltage threshold value, the control module can control the first switch module to disconnect the first connection and control the second switch module to conduct the second connection. Through the power supply circuit, when the target power grid does not have electricity or the voltage cannot reach the grid-connected condition, the power generation assembly is isolated from the target power grid, the problem that the power generation assembly is connected with the target power grid when the target power grid is powered down is avoided, the risk that a user is shocked is further avoided, and the safety of the power supply circuit is improved. The second connection is conducted through controlling the second switch module, so that the control module can continuously judge whether the voltage values at the two sides of the target power grid are smaller than the grid-connected voltage threshold value or not, the voltage at the two sides of the target power grid is continuously monitored, and the safety of the power supply circuit is further improved.
As a possible implementation manner, the control module may be further configured to control the first switch module to conduct the first connection and control the second switch module to conduct the second connection when the voltage value is greater than or equal to the grid-connected voltage threshold value during power generation of the power generation assembly.
Optionally, if the voltage value is greater than or equal to the grid-connected voltage threshold, the target grid voltage is indicated to reach the grid-connected condition. The power supply of the target power grid through the power generation assembly is realized through the first connection conduction and the second connection conduction in the power supply circuit.
The following describes the structure of the first switch module and the structure of the second switch module in detail:
As a possible implementation manner, fig. 3 is a schematic structural diagram of another power supply circuit provided by the present application. As shown in fig. 3 (it should be understood that the control module is not shown in fig. 3), the first switch module may include a first switch and a second switch. The first end of the first switch can be connected with the positive electrode of the output end of the power generation assembly. The second terminal of the first switch may be connected to the first terminal of the voltage detection module. The first end of the second switch may be connected to the negative pole of the output of the power generation assembly. The second terminal of the second switch may be connected to the second terminal of the voltage detection module.
In this implementation, the aforementioned disconnecting the first connection by the first switch module may include disconnecting both the first switch and the second switch. That is, when the power generation assembly is not generating power, both the first switch and the second switch may be turned off. When the power generation assembly generates power and the voltage values at two sides of the target power grid are smaller than the grid-connected voltage threshold value, the first switch and the second switch are kept in an off state. When the power generation component generates power and the voltage value is greater than or equal to the grid-connected voltage threshold, optionally, the first switch and the second switch may be closed to conduct the first connection.
By the first switch and the second switch in the first switch module, a foundation is laid for disconnecting the first connection and conducting the first connection, so that a foundation is laid for improving the safety of a power supply circuit.
As a possible implementation, as shown in fig. 3, the second switch module may include a third switch and a fourth switch. The first end of the third switch can be connected with the positive electrode of the input end of the target power grid. The second terminal of the third switch may be connected to the first terminal of the voltage detection module. The first end of the fourth switch is connected with the negative electrode of the input end of the target power grid. The second terminal of the fourth switch may be connected to the second terminal of the voltage detection module.
In this implementation, the aforementioned disconnecting the second connection by the second switch module may include disconnecting both the third switch and the fourth switch. The second switch module conducting the second connection includes the third switch and the fourth switch both being closed.
That is, when the power generation assembly is not generating power, both the third switch and the fourth switch may be turned off. When the power generation assembly generates power and the voltage values at two sides of the target power grid are smaller than the grid-connected voltage threshold, the third switch and the fourth switch can be switched to be in a closed state. When the power generation component generates power and the voltage value is greater than or equal to the grid-connected voltage threshold, the first switch and the second switch can be optionally kept in a closed state to conduct the second connection.
Through the third switch and the fourth switch in the second switch module, a foundation is laid for disconnecting the second connection and conducting the second connection, so that a foundation is laid for improving the safety of a power supply circuit.
The structure of the voltage detection module is described in detail below:
fig. 4 is a schematic structural diagram of a voltage detection module according to the present application. As shown in fig. 4, as a possible implementation manner, the voltage detection module may include a voltage sampling unit and an isolation unit.
The second end of the first switch module and the first end of the second switch module may be connected to the first end of the voltage sampling unit. The third end of the first switch module and the second end of the second switch module may be both connected to the second end of the voltage sampling unit. The third terminal of the voltage sampling unit may be connected to the first terminal of the isolation unit. The second end of the isolation unit may be connected to the first end of the control module.
The voltage sampling unit can be used for sampling the voltages at two sides of the target power grid to obtain the initial voltages at two sides of the target power grid.
Fig. 5 is a schematic structural diagram of a voltage sampling unit according to the present application. As shown in fig. 5, in some embodiments, the voltage sampling unit may include a first resistor, a second resistor, and a first amplifying subunit.
The second end of the first switch module and the first end of the second switch module may be connected to the first end of the first resistor. The second end of the first resistor and the first end of the second resistor may be connected to the first end of the first amplifying subunit. The second end of the first amplifying subunit may be connected to the first end of the isolation unit. The third end of the first switch module and the second end of the second switch module may be connected to the second end of the second resistor.
The first resistor and the second resistor may be sampling resistors for sampling voltages from two sides of the target power grid. The first amplifying subunit may be configured to amplify a voltage obtained by sampling a voltage from two sides of the target power grid to obtain the initial voltage.
The first amplifying subunit may be any existing operational amplifier, which is not limited in the present application. The resistance of the first resistor, the resistance of the second resistor, the voltage amplification factor of the first amplifying subunit, and the like are not limited.
Through the first resistor and the second resistor, the power supply circuit can sample voltage from two sides of the target power grid. The voltage obtained by sampling can be amplified through the first amplifying subunit, the initial voltage is obtained and then input into the isolation unit, so that the isolation unit can determine whether to isolate the target power grid from the control module based on the initial voltage, and the safety of the power supply circuit is further improved.
The isolation unit can be used for isolating the target power grid from the control module when the initial voltage is zero, and determining the voltage values at two sides of the target power grid according to the initial voltage.
Fig. 6 is a schematic structural diagram of an isolation unit according to the present application. As shown in fig. 6, in some embodiments, the isolation unit may include a first optocoupler diode, a second optocoupler diode, and a third optocoupler diode.
The second end of the first amplifying subunit may be connected to the cathode of the first optocoupler diode. The anode of the first optocoupler diode may be connected to a first output of the target grid. The first end of the first amplifying subunit may be connected to the cathode of the second optocoupler diode. The anode of the second photo-coupler diode and the anode of the third photo-coupler diode can be grounded. The cathode of the third photo-diode may be connected to the first end of the control module.
The positive electrode of the first photo-coupler diode is connected with the first output end of the target power grid, so that the target power grid can provide positive working voltage for the first photo-coupler diode. In some embodiments, the anode of the first optocoupler diode may also be connected to the first output of the target power grid through a voltage conversion module. The voltage conversion module can convert the voltage of the first output end of the target power grid into the working voltage required by the anode of the first photo-coupler diode.
Through the isolation unit, the first photo-coupler diode and the second photo-coupler diode generate brightness with different intensities according to voltage changes at two sides of the target power grid. The third photo-coupling diode can generate currents with different magnitudes according to the brightness, so that the magnitude of the voltage value input to the control module changes along with the magnitude of the current. When the initial voltage is zero, the first optocoupler diode and the second optocoupler diode are not lightened, so that the voltage at two ends of the third optocoupler diode is zero, and the voltage value input to the control module is zero, so that the isolation of the target power grid from the control module (namely, the isolation of the target power grid from the control module when the target power grid is powered off) is realized, and the safety of the power supply circuit is further improved.
It should be understood that the isolation unit may also be implemented by other existing circuits, for example, to isolate the target power grid from the control module when the initial voltage is zero, and determine the voltage values on both sides of the target power grid according to the initial voltage, which is not limited in this aspect of the application.
In some embodiments, the voltage detection module may further include a second amplifying unit, the negative electrode of the third photo-diode being connected to the first end of the control module through the second amplifying unit;
and the second amplifying unit is used for amplifying the voltage at two ends of the third optocoupler diode to obtain the amplified voltage serving as the voltage value at two sides of the target power grid.
Through the second amplifying unit, after the voltage at two ends of the third optocoupler diode is amplified, the voltage can be output to the control module as the voltage value at two sides of the target power grid, so that the control module can judge whether the voltage value is smaller than the grid-connected voltage threshold value or not based on the amplified voltage, the accuracy of the judgment by the control module is improved, the accuracy of the control module for controlling the first switch module and the second switch module based on the judgment result is further improved, and therefore the safety of the power supply circuit is further improved.
Or in some embodiments, the negative electrode of the third optocoupler diode of the isolation unit may be directly connected to the first end of the control module, for example.
In some embodiments, the third terminal of the first amplifying subunit may be connected to the first output terminal of the target power grid. The target grid may be used to provide the operating voltage of the first amplifying subunit to the first amplifying subunit. The second amplifying unit may be further connected to a third terminal of the control module. The control module may be configured to provide the second amplifying unit with an operating voltage of the second amplifying unit.
Alternatively, the third end of the first amplifying subunit may be connected directly to the first output of the target power grid, for example. Or the third end of the first amplifying subunit may also be connected to the first output end of the target power grid through a voltage conversion module or the like. The voltage conversion module can convert the voltage value of the first output end of the target power grid into the working voltage of the first amplifying subunit so that the first amplifying subunit can work.
Alternatively, the second amplifying unit may be directly connected to the third terminal of the control module. Or the second amplifying unit may also be connected to the third terminal of the control module through a voltage conversion module or the like. The voltage conversion module can convert the voltage value of the third end of the control module into the working voltage of the second amplifying unit so that the second amplifying unit can work.
In this embodiment, the voltage sampling unit in the voltage detection module may sample voltages on two sides of the target power grid, to obtain initial voltages on two sides of the target power grid. The isolation unit can isolate the target power grid from the control module when the initial voltage is zero, so that the safety of the power supply circuit is further improved. The voltage values at the two sides of the target power grid are determined through the initial voltage, and the voltage values can be output to the control module, so that the monitoring of the target power grid in an isolated state is realized.
Taking the target power grid as a direct current power grid, the power generation assembly as a photovoltaic power generation assembly, the control module may also be referred to as a control system as an example, and fig. 7 is a schematic structural diagram of another power supply circuit provided by the present application. As shown in fig. 7, where dc+ represents the positive output of the power generation assembly and DC-represents the negative output of the power generation assembly. DC_O+ represents the positive pole of the direct current power grid, and DC_O-represents the negative pole of the direct current power grid. V DC O is the first end of the control module.
K1 represents the first switch, K2 represents the second switch, K3 represents the third switch, and K4 represents the fourth switch. R4 represents the first resistor, and R5 represents the second resistor. U2 represents the first amplifying subunit described above. U1 represents an isolation unit, which may be a linear optocoupler, and U3 may be used to represent a second amplifying unit.
As shown in fig. 7, where C1 is the anti-ringing capacitance and R2 is the current limiting resistor (which may be used to protect the optocoupler diode in U1). R3 is also a resistor, which can be used to adjust the magnification of U3.
In addition, the Vcc' end of the U2 is connected with the first output end of the target power grid. The target grid may be used to provide the first amplifying subunit with the operating voltage of the first amplifying subunit (or the dc grid may be used as the primary operating power source of the U3). The 5V interface of U1 is the positive pole of first opto-coupler diode, can be connected with the first output of target electric wire netting. The Vcc terminal of U3 may be connected to the third terminal of the control module. The control module may be used to provide an operating voltage for U3.
It should be understood that fig. 7 does not show the control module and the connection relationship of the devices to the control module. The connection relationship between the different devices and the control module may refer to the structure described in any of the foregoing embodiments, and will not be described herein.
Based on the power supply circuit shown in fig. 7, when the photovoltaic cell assembly does not generate electricity, the control system (i.e. the control module) is powered off, and all of the initial states of K1-K4 are disconnected, so that the photovoltaic cell assembly and the control system are physically disconnected no matter whether the external direct current power grid is powered on or not.
When the photovoltaic battery assembly starts to generate electricity, the control system starts to work, and K1 and K2 are kept open and K3 and K4 are kept closed. The optocoupler primary of the linear optocoupler may be active (diode Guan Liang) or inactive (diode not lit) depending on whether the external dc grid is powered.
If the external direct current power grid (namely, the direct current power grid) is not powered or the voltage cannot reach the grid-connected condition (namely, the voltage value is smaller than the grid-connected voltage threshold), K1 and K2 are disconnected, K3 and K4 are closed, and the control system monitors the state of the external direct current power grid all the time until the voltage values at the two sides of the direct current power grid reach the grid-connected condition.
If the voltage of the external direct current power grid reaches the grid-connected condition, the control system can control K1, K2, K3 and K4 to be closed, and direct current generated by the photovoltaic cell assembly is controlled by the control system and connected to the external direct current power grid.
In this embodiment, through the four-switch isolation circuit topology, physical isolation from an external dc power grid is achieved when the photovoltaic cell assembly is in a non-power generation state. When the external direct current power grid is not powered or does not meet grid connection conditions, the photovoltaic cell assembly generates power which is not grid-connected and physical isolation is realized. The photovoltaic battery module and the direct current power grid are physically isolated when any one of the photovoltaic battery module and the direct current power grid loses power, the anti-islanding function is achieved, and the cost of the power supply circuit is reduced. Furthermore, the optocoupler detection circuit in the power supply circuit can also realize the monitoring of an external direct current power grid in an isolated state.
The application further provides electric equipment. The power supply circuit of any one of the foregoing embodiments may be included in the power consumer. The electric device may be, for example, any electric device such as a photovoltaic water heater and an air conditioner, which is not limited in the present application.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.
Claims (10)
1. The power supply circuit is characterized by comprising a power generation assembly and a control module, wherein the power generation assembly comprises a first switch module, a voltage detection module and a second switch module, a first end of the first switch module is connected with an output end of the power generation assembly, a second end of the first switch module and a first end of the second switch module are connected with a first end of the voltage detection module, a third end of the first switch module and a second end of the second switch module are connected with a second end of the voltage detection module, a third end of the second switch module is connected with an input end of a target power grid, a third end of the voltage detection module is connected with a first end of the control module, and a second end of the control module is connected with a fourth end of the first switch module and a fourth end of the second switch module.
When the power generation assembly does not generate power, the first switch module is used for disconnecting a first connection between the power generation assembly and the first switch module, and the second switch module is used for disconnecting a second connection between the target power grid and the second switch module;
The power generation system comprises a power generation assembly, a voltage detection module, a control module and a first switch module, wherein the power generation assembly is used for generating power, the voltage detection module is used for detecting voltage values on two sides of a target power grid and outputting the voltage values to the control module, and the control module is used for controlling the first switch module to disconnect the first connection and controlling the second switch module to conduct the second connection when the voltage values are smaller than a grid-connected voltage threshold.
2. The power supply circuit of claim 1, wherein the first switch module comprises a first switch and a second switch, a first end of the first switch is connected with an output positive electrode of the power generation assembly, a second end of the first switch is connected with a first end of the voltage detection module, a first end of the second switch is connected with an output negative electrode of the power generation assembly, a second end of the second switch is connected with a second end of the voltage detection module, and the first switch module disconnects the first connection, including disconnecting both the first switch and the second switch;
And/or the number of the groups of groups,
The second switch module comprises a third switch and a fourth switch, wherein the first end of the third switch is connected with the positive electrode of the input end of the target power grid, the second end of the third switch is connected with the first end of the voltage detection module, the first end of the fourth switch is connected with the negative electrode of the input end of the target power grid, the second end of the fourth switch is connected with the second end of the voltage detection module, the second switch module is disconnected, the third switch and the fourth switch are both disconnected, and the second switch module is connected, the third switch and the fourth switch are both closed.
3. The power supply circuit according to claim 1 or 2, wherein the voltage detection module comprises a voltage sampling unit and an isolation unit;
The second end of the first switch module and the first end of the second switch module are both connected with the first end of the voltage sampling unit, and the third end of the first switch module and the second end of the second switch module are both connected with the second end of the voltage sampling unit;
the voltage sampling unit is used for sampling the voltages at the two sides of the target power grid to obtain initial voltages at the two sides of the target power grid;
And the isolation unit is used for isolating the target power grid from the control module when the initial voltage is zero, and determining the voltage values at two sides of the target power grid according to the initial voltage.
4. The power supply circuit of claim 3, wherein the voltage sampling unit comprises a first resistor, a second resistor, and a first amplifying subunit;
The second end of the first switch module and the first end of the second switch module are connected with the first end of the first resistor, the second end of the first resistor and the first end of the second resistor are connected with the first end of the first amplifying subunit, the second end of the first amplifying subunit is connected with the first end of the isolating unit, and the third end of the first switch module and the second end of the second switch module are connected with the second end of the second resistor;
the first amplifying subunit is configured to amplify a voltage obtained by sampling voltages from two sides of the target power grid to obtain the initial voltage.
5. The power supply circuit of claim 4, wherein the isolation unit comprises a first optocoupler diode, a second optocoupler diode, and a third optocoupler diode;
The second end of the first amplifying subunit is connected with the cathode of the first photo-coupling diode, the anode of the first photo-coupling diode is connected with the first output end of the target power grid, the first end of the first amplifying subunit is connected with the cathode of the second photo-coupling diode, the anode of the second photo-coupling diode and the anode of the third photo-coupling diode are grounded, and the cathode of the third photo-coupling diode is connected with the first end of the control module.
6. The power supply circuit of claim 5, wherein the voltage detection module further comprises a second amplification unit, and wherein the negative electrode of the third optocoupler diode is connected with the first end of the control module through the second amplification unit;
And the second amplifying unit is used for amplifying the voltages at two ends of the third optocoupler diode to obtain amplified voltages serving as voltage values at two sides of the target power grid.
7. The power supply circuit of claim 6, wherein the third terminal of the first amplifying subunit is connected to the first output terminal of the target power grid, the target power grid being configured to provide the operating voltage of the first amplifying subunit to the first amplifying subunit;
the second amplifying unit is also connected with a third end of the control module, and the control module is used for providing working voltage of the second amplifying unit for the second amplifying unit.
8. The power supply circuit according to claim 1 or 2, wherein the control module is further configured to control the first switching module to conduct the first connection and the second switching module to conduct the second connection when the voltage value is greater than or equal to the grid-tie voltage threshold value while the power generation assembly generates power.
9. The power supply circuit according to claim 1 or 2, wherein the power generation component is a photovoltaic power generation component, the photovoltaic power generation component outputs direct current, and the target power grid is a direct current power grid.
10. A powered device comprising a power supply circuit as claimed in any one of the preceding claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310796678.4A CN119231612A (en) | 2023-06-30 | 2023-06-30 | Power supply circuits and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310796678.4A CN119231612A (en) | 2023-06-30 | 2023-06-30 | Power supply circuits and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119231612A true CN119231612A (en) | 2024-12-31 |
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ID=94045220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310796678.4A Pending CN119231612A (en) | 2023-06-30 | 2023-06-30 | Power supply circuits and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119231612A (en) |
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2023
- 2023-06-30 CN CN202310796678.4A patent/CN119231612A/en active Pending
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