A control circuit and method for industrial backup power supply

Abstract

The present invention provides a control circuit and method for an industrial backup power supply. First, it is determined whether it is necessary to switch to a backup power supply mode according to the amplitude and stability of first voltage information; if not, the first power information and the second power information are obtained; then, it is determined whether it is necessary to switch to a charging power supply mode according to the size relationship between the first power information and the second power information; if not, the first power information of an energy storage device is obtained; finally, it is determined whether a preset power threshold is exceeded according to the first power information; if so, it is switched to a backup power supply mode; if not, it is switched to a mains power supply mode; the present invention automatically switches to a load power supply object according to the stability of the mains, the size relationship between the generated power and the load power, and the power storage status of the energy storage device, thereby ensuring the stability of the power supply and improving the utilization rate of the generated power of the power generation equipment, thereby reducing the electricity cost of the enterprise.

Description

Technical Field

[0001] The present invention belongs to the field of industrial backup power supply, and more specifically, discloses a control circuit and method of an industrial backup power supply. Background Art

[0002] At present, industrial systems, especially manufacturing industries, need to maintain a stable power supply for a long time due to their industry characteristics. They have very high requirements for sustainable power supply of backup power supplies and large electricity demand. Diesel generators have become the first choice for backup power supplies for industrial systems due to their simple and mature technology. However, diesel generators have the problem of long startup time and cannot quickly provide power supply for industrial systems when the power grid loses power. On the other hand, diesel generators generate electricity by burning diesel, which has a greater impact on the environment. Therefore, it is increasingly important to seek clean energy as a backup power supply to support the stability of industrial system power supply.

[0003] In recent years, there have been attempts to generate electricity using photovoltaic equipment and use energy storage systems as backup power sources. However, since the backup power source is set to start only when the power grid fails, the battery used as the backup power source in the energy storage system is usually fully charged, and photovoltaic equipment may not store power after generating it, resulting in a low power storage rate. Therefore, there is an urgent need for a control circuit and method for an industrial backup power source that can automatically switch the power supply, has high energy utilization, and is environmentally friendly. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a control circuit and method for an industrial standby power supply, which automatically switches to the object of load energy supply according to the stability of the city power, the relationship between the generated power and the load power, and the energy storage situation of the energy storage device, thereby ensuring the stability of the power supply and improving the utilization rate of the generated power of the power generation equipment, thereby reducing the enterprise's electricity costs.

[0005] In order to achieve the above object, the first aspect of the present invention provides a control circuit of an industrial backup power supply, the control circuit of the industrial backup power supply comprising:

[0006] Energy storage backup power supply module, used to store electric energy and provide electric energy supply of set amplitude to load on demand;

[0007] A charging management module is used to obtain external power supply and provide power supply to the energy storage device or load;

[0008] The energy supply switching module is used to select an energy supply device that provides electrical energy to the load according to the settings.

[0009] In this solution, the energy storage backup power supply module includes:

[0010] An output management unit, including an adjustable voltage stabilization circuit, for adjusting the output voltage of the energy storage backup power module;

[0011] The energy storage device is used to store the electric energy after receiving the electric energy supply from the charging management module, and to provide the electric energy supply to the output management unit.

[0012] In this solution, the charging management module includes:

[0013] A charging management unit, used to convert the electric energy of the external electric energy input voltage into a voltage that can be received by the energy storage backup power supply module;

[0014] The power generation unit is used to convert other forms of energy into electrical energy and transmit it to the charging management unit.

[0015] In this solution, the energy supply switching module includes:

[0016] The analog switching switch includes at least three power supply input terminals, including an energy storage backup power supply module, a charging management module and a mains network, and is used to select the energy supply device to which the load is connected.

[0017] A second aspect of the present invention further provides a control method for an industrial backup power supply, which is applied to any of the control circuits of the industrial backup power supply described above, and specifically comprises:

[0018] Acquiring first voltage information;

[0019] Determining whether the first voltage information is lower than a preset first voltage threshold;

[0020] If yes, it enters the backup power supply mode;

[0021] If not, determining whether it is in a stable state according to the first voltage information;

[0022] If not, it enters the backup power supply mode;

[0023] If yes, obtaining the first power information and the second power information;

[0024] determining whether the second power information exceeds the first power information;

[0025] If yes, then enter the charging power supply mode;

[0026] If not, obtaining first power information;

[0027] Determining whether the first power information exceeds a preset first power threshold;

[0028] If yes, it enters the backup power supply mode;

[0029] If not, enter the AC power supply mode.

[0030] In this solution, judging whether the voltage is in a stable state according to the first voltage information is specifically:

[0031] acquiring the first voltage information;

[0032] Calculating a difference between the first voltage information and a preset second voltage threshold to obtain first voltage difference information;

[0033] Determining whether the first voltage difference information is lower than a preset first voltage difference threshold;

[0034] If so, it indicates that the first voltage information is in a stable state.

[0035] In this solution, judging whether the voltage is in a stable state according to the first voltage information is specifically:

[0036] Collecting and recording the first voltage information according to a preset time period;

[0037] Select at least two of the first voltage information that are most recently collected and recorded to perform linear fitting to obtain first slope information;

[0038] Determining whether the first slope information is within a preset slope range;

[0039] If so, it indicates that the first voltage information is in a stable state.

[0040] This plan also includes:

[0041] Acquire the first power information;

[0042] Determining whether the first power information is lower than a preset second power threshold;

[0043] If yes, obtaining the second power information;

[0044] Determining whether the second power information exceeds a preset first power threshold;

[0045] If yes, it enters the power generation and charging mode;

[0046] If not, enter the AC charging mode.

[0047] This plan also includes:

[0048] Acquiring first current information;

[0049] First resistance information is calculated according to the first current information and a preset feedback resistance relationship;

[0050] Obtaining second resistance information;

[0051] Calculating a difference between the first resistance information and the second resistance information to obtain first resistance difference information;

[0052] Determining whether the first resistance difference information exceeds a preset resistance difference threshold;

[0053] If yes, a resistance adjustment instruction is sent according to the first resistance difference information to adjust the resistance of the feedback resistor.

[0054] This plan also includes:

[0055] The output levels of at least two pins are controlled according to the power supply mode, or a preset switch switching instruction is sent to control the analog switch.

[0056] The present invention provides a control circuit and method for an industrial backup power supply. First, it is determined whether it is necessary to switch to a backup power supply mode according to the amplitude and stability of first voltage information; if not, the first power information and the second power information are obtained; then, it is determined whether it is necessary to switch to a charging power supply mode according to the size relationship between the first power information and the second power information; if not, the first power information of an energy storage device is obtained; finally, it is determined whether a preset power threshold is exceeded according to the first power information; if so, it is switched to a backup power supply mode; if not, it is switched to a mains power supply mode; the present invention automatically switches to a load power supply object according to the stability of the mains, the size relationship between the generated power and the load power, and the power storage status of the energy storage device, thereby ensuring the stability of the power supply and improving the utilization rate of the generated power of the power generation equipment, thereby reducing the electricity cost of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0058] Figure 1 A structural block diagram of the control circuit of the industrial backup power supply provided by an embodiment of the present invention is shown;

[0059] Figure 2 A schematic diagram showing a control method of the industrial backup power supply provided by an embodiment of the present invention is shown;

[0060] Figure 3 A flowchart for determining whether the first voltage information is in a stable state is shown in an embodiment of the present invention;

[0061] Figure 4 Another flow chart for determining whether the first voltage information is in a stable state provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless the embodiments of the present invention are explicitly defined in this way.

[0064] The words "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0065] Please refer to Figure 1 , Figure 1 A structural block diagram of the control circuit of the industrial backup power supply provided by an embodiment of the present invention is shown.

[0066] like Figure 1 As shown, the first aspect of the present invention discloses that the control circuit of the industrial backup power supply includes:

[0067] The energy storage backup power supply module 102 is used to store electric energy and provide electric energy supply of a set amplitude to the load as needed;

[0068] The charging management module 104 is used to provide power supply to the energy storage device or load after obtaining external power supply;

[0069] The energy supply switching module 106 is used to select an energy supply device that provides electrical energy to the load according to the settings.

[0070] It should be noted that the load refers to the electrical equipment in the industrial system, and the size of the load is related to the industrial production status; for example, if only the lighting working state is required, the load of the industrial system is small, that is, the load power required when the industrial system is running is low; if the equipment in the industrial system is running at full load, the load of the industrial system is large, that is, the load power required when the industrial system is running is high. In the present invention, it is necessary to power the circuit through the mains network, which can be used to supply power to the load and provide charging power to the charging management module. The mains network includes but is not limited to 220 volts AC, 380 volts AC, and voltages that meet the requirements of the load and the charging management module after conversion by a transformer. The energy storage backup power supply module 102 includes an energy storage device and an output management unit; the energy storage device regulates the voltage of the electric energy through the output management unit and provides electric energy supply to the load. The charging management module 104 includes a power generation unit and a charging management unit; the power generation unit converts other energy into electric energy, and then supplies power to the energy storage device through the charging management unit for charging, and the charging management unit can also directly supply electric energy to the load. The energy supply switching module 106 is a controllable switching switch, which selects the power supply object for the load; the power supply object includes at least the mains network, the backup power module and the charging management module. The processing selects one of the mains network, the backup power module and the charging management module through the energy supply switching module 106 to provide power supply for the load to cope with the abnormal situation of the mains network; in addition, the power supply object can also be adjusted according to the load power, charging status and power situation to improve the utilization rate of clean energy, thereby reducing the electricity cost of the mains network.

[0071] According to an embodiment of the present invention, the energy storage backup power supply module includes:

[0072] An output management unit, including an adjustable voltage stabilization circuit, for adjusting the output voltage of the energy storage backup power module;

[0073] The energy storage device is used to store the electric energy after receiving the electric energy supply from the charging management module, and to provide the electric energy supply to the output management unit.

[0074] It should be noted that the energy storage backup power supply module is used to store electric energy and provide electric energy of a set amplitude to the load on demand, and includes an energy storage device and an output management unit. The energy storage device stores electric energy and serves as a backup power supply to supply power to the load when an abnormality occurs in the mains power network. The energy storage device includes at least one input terminal and at least one output terminal; the input terminal of the energy storage device is connected to a charging device for receiving electric energy replenishment; the output terminal of the energy storage device is connected to the output management unit of the energy storage backup power supply module. The output management unit is a unit that adjusts the output voltage of the energy storage backup power supply module to meet the power demand of the load, and includes at least one input terminal and at least one output terminal; the input terminal of the output management unit is connected to the energy storage device to obtain the power supply of the energy storage device; the output terminal of the output management power supply is connected to the energy supply switching module to output electric energy to the load according to the power supply demand.

[0075] According to an embodiment of the present invention, the charging management module includes:

[0076] A charging management unit, used to convert the electric energy of the external electric energy input voltage into a voltage that can be received by the energy storage backup power supply module;

[0077] The power generation unit is used to convert other forms of energy into electrical energy and transmit it to the charging management unit.

[0078] It should be noted that the charging management module is used to obtain external power supply and then provide power supply to the energy storage device or load, including a charging and generating unit and charging management. The power generation unit refers to a device that converts various energy sources into power sources, including but not limited to thermal power generation equipment, wind power generation equipment, and solar power generation equipment; in the application of the present invention, solar power generation equipment or wind power generation equipment is used as a power generation unit to collect clean energy and convert it into reserve electric energy, reflecting the concept of environmental protection and saving electric energy. The charging management unit includes at least two input terminals and two output terminals; the two input terminals of the charging management unit are respectively connected to the power generation unit and the city power network as the power supply of the charging management unit; the two output terminals of the charging management unit are respectively connected to the energy storage backup power supply module and the energy supply switching module, as the power output terminal of the charging management module to charge the energy storage backup power supply module or supply power to the load according to the power supply demand.

[0079] According to an embodiment of the present invention, the energy supply switching module includes:

[0080] The analog switching switch includes at least three power supply input terminals, including an energy storage backup power supply module, a charging management module and a mains network, and is used to select the energy supply device to which the load is connected.

[0081] It should be noted that the analog switching switch is an analog switching chip or a switching circuit, and the energy storage backup power supply module, the charging management module or the mains network serves as the input end of the analog switching switch, and is connected to the load after passing through the analog switching switch to provide power supply for the load. As an implementation method, when the analog switching switch is an analog switching chip, it is connected to the processor through a control pin or a communication interface, and the processor controls the pin or sends a preset communication instruction to enable the analog switch chip to complete the input channel switching and achieve the effect of selecting the input end. As another implementation method, when the analog switching switch is a switching circuit, the on-off state of the switching circuit is changed by controlling the level state of the input pin to achieve the effect of input channel switching.

[0082] Please refer to Figure 2 , Figure 2 A schematic diagram of a method for controlling the industrial backup power supply provided by an embodiment of the present invention is shown.

[0083] like Figure 2 As shown, the second aspect of the present invention discloses a control method for the industrial backup power supply, the method comprising:

[0084] S200, obtaining first voltage information;

[0085] S202, determining whether the first voltage information is lower than a preset first voltage threshold;

[0086] If so, S218, the backup power supply mode is entered;

[0087] If not, S204, determining whether the voltage is in a stable state according to the first voltage information;

[0088] If not, S218, enter the backup power supply mode;

[0089] If yes, S206, obtaining the first power information and the second power information;

[0090] S208, determining whether the second power information exceeds the first power information;

[0091] If so, S214, entering the charging power supply mode;

[0092] If not, S210, obtaining first power information;

[0093] S212, determining whether the first power information exceeds a preset first power threshold;

[0094] If so, S218, the backup power supply mode is entered;

[0095] If not, S216, the mains power supply mode is entered.

[0096] It should be noted that the first voltage information is the voltage value of the mains network in the industrial system; the first power information is the load power required for the operation of the industrial system; the second power information is the maximum power that can be output by the charging management module when generating electric energy through the power generation unit, also known as the generated power; the first electric quantity information is the electric quantity value of the energy storage device in the energy storage backup power supply module. The present invention is provided with three power supply modes, including a mains power supply mode, a backup power supply mode and a charging power supply mode; the mains power supply mode is to select the mains network to supply power to the load through the energy supply switching module; the backup power supply mode is to select the energy storage backup power supply module to supply power to the load through the energy supply switching module; the charging power supply mode is to select the charging management module to supply power to the load through the energy supply switching module. First, measure the voltage value of the AC power network, that is, the first voltage information, and determine whether the first voltage information is lower than the preset first voltage threshold; if so, it means that there is a AC power outage, and at this time, enter the backup power supply mode; if not, it means that the voltage amplitude of the AC power network meets the load requirements, and then determine whether the first voltage information is in a stable state; if not, it means that the stability of the AC power network does not meet the requirements of the industrial system, so enter the backup power supply mode to ensure the normal operation of the industrial system; if so, it means that the voltage stability of the AC power network meets the operating requirements of the industrial system, and secondly, measure and obtain the load power required for the current operation of the industrial system and the power generation power of the power generation unit of the charging management module, that is, the first power information and the second power information; determine whether the second power information exceeds the first power information; if so, it means that the power generation power of the power generation unit can meet the load power of the industrial system. At this time, the charging power supply mode is entered; if not, it means that the power generation power of the power generation unit is not enough to meet the load power of the industrial system, and it is necessary to provide energy to the industrial system in other ways. Finally, according to the first power information of the energy storage device, it is determined whether it exceeds the preset first power threshold; if so, it means that the energy storage device has sufficient power, and enters the backup power supply mode, which is used as a temporary power supply to supply power to the load of the industrial system, so as to reduce the consumption of the mains network and reduce the electricity cost of the enterprise; if not, enter the mains power supply mode, and ensure the normal operation of the industrial system through stable mains.

[0097] Please refer to Figure 3 , Figure 3 A flow chart for determining whether the first voltage information is in a stable state is shown in an embodiment of the present invention.

[0098] In the embodiment of the present invention, judging whether the voltage is in a stable state according to the first voltage information is specifically:

[0099] S302, obtaining the first voltage information;

[0100] S304, calculating a difference between the first voltage information and a preset second voltage threshold to obtain first voltage difference information;

[0101] S306, determining whether the first voltage difference information is lower than a preset first voltage difference threshold;

[0102] S308: If yes, it indicates that the first voltage information is in a stable state.

[0103] It should be noted that the second voltage threshold is a voltage value that satisfies the normal operation of the industrial system. First, the difference between the output voltage of the current mains network and the second voltage threshold is calculated, which is recorded as the first voltage difference; the first voltage difference reflects the difference between the output voltage of the current mains network and the voltage required by the load. Then determine whether the first difference information is lower than the preset first voltage difference threshold; if so, the difference is low, and the mains network is in a stable state that satisfies the operation of the industrial system; if not, it means that the mains network is in an unstable state. Among them, the first voltage difference threshold is usually set to 10% of the second voltage threshold. For example, when the second voltage threshold is 220 volts, the allowed first voltage difference threshold is 22 volts.

[0104] Please refer to Figure 4 , Figure 4 Another flow chart for determining whether the first voltage information is in a stable state provided by an embodiment of the present invention is shown.

[0105] In the embodiment of the present invention, judging whether the voltage is in a stable state according to the first voltage information is specifically:

[0106] S402, collecting and recording the first voltage information according to a preset time period;

[0107] S404, selecting at least two of the first voltage information that are most recently collected and recorded to perform linear fitting to obtain first slope information;

[0108] S406, determining whether the first slope information is within a preset slope range;

[0109] S408: If yes, it indicates that the first voltage information is in a stable state.

[0110] It should be noted that the first slope information is the slope value of the straight line obtained by linear fitting of the first voltage information in a coordinate system established with time as the horizontal coordinate and voltage value as the vertical coordinate. The voltage value of the mains network is collected and recorded according to a preset time period, and at least 2 latest collected and recorded voltage values ​​of the mains network are selected for linear fitting to obtain a linear fitting relationship, and then the slope value of the fitting straight line is determined, that is, the first slope information; wherein, the time period is usually set to 100ms, 200ms or 500ms; in actual applications, the linear fitting is usually obtained by least squares calculation, which is a process calculated by the processor and does not need to be obtained after drawing the coordinate system. When the first slope information is within the preset slope range, if so, it means that the fitted straight line tends to be parallel to the horizontal coordinate, that is, it does not show a trend of rapid rise or fall; wherein, in actual applications, the slope range is usually within -0.1 to 0.1.

[0111] It is worth mentioning that when the first slope information is within a preset slope range;

[0112] Obtain the first correlation coefficient information of the fitting straight line;

[0113] Determining whether the correlation coefficient information is greater than a preset correlation coefficient threshold;

[0114] If so, it means that the first voltage information is in a stable state.

[0115] It should be noted that the first correlation coefficient information is a goodness of fit value after linear fitting of the first voltage information. When the correlation coefficient is closer to 1, the distribution deviation between the fitted straight line and the first voltage information is lower. When the first correlation coefficient information is greater than a preset correlation coefficient threshold, usually the correlation coefficient threshold is set to 0.99, it means that the distribution deviation between the fitted straight line and the first voltage information is low, that is, the first voltage information is in a stable state.

[0116] In an embodiment of the present invention, it also includes:

[0117] Acquire the first power information;

[0118] Determining whether the first power information is lower than a preset second power threshold;

[0119] If yes, obtaining the second power information;

[0120] Determining whether the second power information exceeds a preset first power threshold;

[0121] If yes, it enters the power generation and charging mode;

[0122] If not, enter the AC charging mode.

[0123] It should be noted that the present invention includes two modes for charging the energy storage device, a power generation charging mode and a mains charging mode; the power generation charging mode is that the power generation unit provides power to the charging management unit to charge the energy storage module; the mains charging mode is that the mains network provides power to the charging management unit to charge the energy storage module. First, the first power information of the energy storage device is obtained; when the first power information is lower than the preset second power threshold, it means that the power of the energy storage device is in a state where fast charging is required. At this time, the second power information of the charging management module is obtained, that is, the maximum power that can be output when the power generation unit generates power, that is, the power generation value; it is determined whether the power generation exceeds the preset first power threshold; if so, it means that the power generated by the power generation unit can meet the fast charging requirements of the energy storage device, so it enters the power generation charging mode, and uses clean energy instead of the mains to supplement the energy storage device with power, reducing the mains consumption cost; if not, it means that the power generated by the power generation unit is not enough to meet the fast charging requirements of the energy storage device, and the energy storage device needs to be quickly charged through the mains network to ensure the power of the backup power supply.

[0124] In an embodiment of the present invention, it also includes:

[0125] Acquiring first current information;

[0126] First resistance information is calculated according to the first current information and a preset feedback resistance relationship;

[0127] Obtaining second resistance information;

[0128] Calculating a difference between the first resistance information and the second resistance information to obtain first resistance difference information;

[0129] Determining whether the first resistance difference information exceeds a preset resistance difference threshold;

[0130] If yes, a resistance adjustment instruction is sent according to the first resistance difference information to adjust the resistance of the feedback resistor.

[0131] It should be noted that the first current information is the target output current value of the charging management unit; the first resistance information is the resistance value required to be set for the feedback resistor when the first current information is output; and the second resistance information is the real-time resistance value of the feedback resistor of the charging management unit. The charging management unit is provided with a feedback resistor for adjusting the output current of the charging management unit, so as to achieve the purpose of adjusting the charging power or adjusting the working power provided to the load. According to the target output current value of the charging management unit and the feedback resistance relationship, the first resistance information is calculated. Then, the difference between the first resistance information and the second resistance information is calculated to obtain the first resistance difference information; when the first resistance difference information exceeds the preset resistance difference threshold, it indicates that the output current of the charging management unit is greatly different from the target current value, and current adjustment is required. Finally, a resistance adjustment instruction is sent to the charging management unit according to the first resistance difference information to adjust the resistance value of the feedback resistor. In practical applications, the feedback resistor is usually a digital adjustable resistor, and the processor obtains the resistance value of the digital adjustable resistor through a preset first communication instruction, and adjusts the resistance value of the digital adjustable resistor through a preset second communication instruction.

[0132] In an embodiment of the present invention, it also includes:

[0133] The output levels of at least two pins are controlled according to the power supply mode, or a preset switch switching instruction is sent to control the analog switch.

[0134] It should be noted that the power supply switching module is switched on and off according to the power supply mode. As an implementation method, when the analog switching switch is an analog switch chip, it is connected to the processor through a control pin or a communication interface. The processor controls the pin or sends a preset communication instruction to enable the analog switch chip to complete the input channel switching and achieve the effect of selecting the input end. As another implementation method, when the analog switching switch is a switch circuit, the on-off condition of the switch circuit is changed by controlling the level state of the input pin to achieve the effect of input channel switching.

[0135] It is worth mentioning that it also includes:

[0136] When the energy storage device is in the state of electric energy replenishment;

[0137] Acquiring first temperature information;

[0138] Determining whether the first temperature information exceeds a preset temperature threshold;

[0139] If yes, searching a preset temperature-current correspondence table according to the first temperature information to obtain second current information;

[0140] The output current of the charging management unit is adjusted according to the second current information.

[0141] It should be noted that the first temperature information is the real-time temperature value of the energy storage device. When the energy storage device is in the state of electric energy replenishment, if the first temperature information exceeds the preset temperature threshold, it means that the temperature of the energy storage device is too high, and it is necessary to reduce the charging power to achieve the purpose of cooling, thereby ensuring the service life of the energy storage device. According to the first temperature information, the temperature-current correspondence table preset in the processor is searched to obtain the second current information, that is, the output current value of the charging management unit that can meet the cooling requirement. Finally, the feedback resistance of the charging management unit is adjusted according to the second current information.

[0142] It is worth mentioning that it also includes:

[0143] When the first voltage information is in an unstable state;

[0144] Acquire the first power information;

[0145] Determining whether the first power information exceeds a preset second power threshold;

[0146] If yes, then start to enter the AC charging mode.

[0147] It should be noted that when the mains power network is in an unstable state and the load power required by the industrial system is greater than the second power threshold, it means that the mains power is unstable and the required power demand is large. In order to deal with the above situation, the present invention adopts a mode of charging and discharging energy storage equipment, that is, providing a stable power supply for the load of the industrial system through the energy storage equipment, and supplementing the energy storage equipment with power through the mains power network. Thereby improving the power consumption stability of the industrial system.

[0148] It is worth mentioning that it also includes:

[0149] When in mains charging mode;

[0150] Acquire the first power information;

[0151] Determining whether the first power information exceeds a preset third power threshold;

[0152] If yes, obtaining the second power information;

[0153] Determine whether the second power information exceeds a preset first power range;

[0154] If not, it enters the power generation and charging mode;

[0155] If so, the output current of the charging management unit is reduced.

[0156] It should be noted that when the mains network charges the energy storage device, when the first power information exceeds the preset third power information, it means that the power value of the energy storage device has reached a state of being about to be fully charged. At this time, according to the power generation power of the charging management module, that is, the second power information, it is judged whether the second power information exceeds the preset first power range; if not, it means that the power generation power of the charging management module meets the charging power requirements of the energy storage device, so it enters the power generation and charging mode; if so, it means that the power generation power of the charging management module does not meet the charging power requirements of the energy storage device, so the purpose of reducing the charging power is achieved by reducing the output current of the charging management unit, avoiding the risk of overcharging the energy storage device due to continuous high-power charging, so as to protect the service life of the energy storage device.

[0157] In summary, the present invention provides a control circuit and method for an industrial backup power supply. First, it is determined whether it is necessary to switch to a backup power supply mode according to the amplitude and stability of the first voltage information; if not, the first power information and the second power information are obtained; then, it is determined whether it is necessary to switch to a charging power supply mode according to the size relationship between the first power information and the second power information; if not, the first power information of the energy storage device is obtained; finally, it is determined whether the preset power threshold is exceeded according to the first power information; if so, it is switched to the backup power supply mode; if not, it is switched to the AC power supply mode; the present invention automatically switches to the object of load power supply according to the stability of the AC power, the size relationship between the generated power and the load power, and the power storage condition of the energy storage device, thereby ensuring the stability of the power supply and improving the utilization rate of the generated power of the power generation equipment, thereby reducing the electricity cost of the enterprise.

[0158] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0159] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0160] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for an industrial backup power supply, applied to a control circuit of an industrial backup power supply, the control circuit of the industrial backup power supply comprising: Energy storage backup power supply module, used to store electric energy and provide electric energy supply of set amplitude to load on demand; The energy storage backup power supply module includes an output management unit and an energy storage device; The output management unit includes an adjustable voltage stabilization circuit for adjusting the output voltage of the energy storage backup power supply module; The energy storage device is used to store the electric energy after receiving the electric energy supply from the charging management module, and to provide the electric energy supply to the output management unit; A charging management module is used to obtain external power supply and provide power supply to the energy storage device or load; The charging management module includes a charging management unit and a power generation unit; The charging management unit is used to convert the electric energy of the external electric energy input voltage into a voltage that can be received by the energy storage backup power supply module, and is provided with a feedback resistor for adjusting the output current of the charging management unit; The power generation unit is used to convert other forms of energy into electrical energy and transmit it to the charging management unit; An energy supply switching module, used to select an energy supply device that provides electrical energy to the load according to the settings; The energy supply switching module includes an analog switching switch; The analog switch includes at least three power supply input terminals for selecting the power supply device to which the load is connected; The power supply input end includes an energy storage backup power supply module, a charging management module and a mains power network; Characterized in that, the control method of the industrial backup power supply specifically includes: Acquiring first voltage information; Determining whether the first voltage information is lower than a preset first voltage threshold; If yes, it enters the backup power supply mode; If not, determining whether it is in a stable state according to the first voltage information; If not, it enters the backup power supply mode; If yes, obtaining the first power information and the second power information; determining whether the second power information exceeds the first power information; If yes, then enter the charging power supply mode; If not, obtaining first power information; Determining whether the first power information exceeds a preset first power threshold; If yes, it enters the backup power supply mode; If not, it enters the mains power supply mode; Obtain the first power information; determine whether the first power information is lower than a preset second power threshold; if so, obtain the second power information; determine whether the second power information exceeds a preset first power threshold; if so, enter a power generation charging mode; if not, enter a mains charging mode; Acquire first current information; calculate first resistance information according to the first current information and a preset feedback resistance relationship; acquire second resistance information; calculate the difference between the first resistance information and the second resistance information to obtain first resistance difference information; determine whether the first resistance difference information exceeds a preset resistance difference threshold; if so, send a resistance adjustment instruction according to the first resistance difference information to adjust the feedback resistance; When the first voltage information is in an unstable state; obtaining the first power information; determining whether the first power information exceeds a preset second power threshold; if so, starting to enter the mains charging mode; the first voltage information is the voltage value of the mains network in the industrial system; The first power information is the load power required for the operation of the industrial system; The second power information is the maximum power that can be output by the charging management module when the charging management module generates electric energy through the power generation unit; The first power information is the power value of the energy storage device in the energy storage backup power supply module; The mains power supply mode is to select the mains network as the power supply for the load through the energy supply switching module; The backup power supply mode is to select the energy storage backup power supply module to supply power to the load through the energy supply switching module; The charging power supply mode is to select the charging management module to supply power to the load through the energy supply switching module; The first current information is a target output current value of the charging management unit; The first resistance information is the resistance value that the feedback resistor needs to set when outputting the first current information; The second resistance information is the real-time resistance value of the feedback resistor of the charging management unit.

2. The control method of an industrial backup power supply according to claim 1, characterized in that: The determining whether the voltage is in a stable state according to the first voltage information is specifically: acquiring the first voltage information; Calculating a difference between the first voltage information and a preset second voltage threshold to obtain first voltage difference information; Determining whether the first voltage difference information is lower than a preset first voltage difference threshold; If yes, it means that the first voltage information is in a stable state; The second voltage threshold is a voltage value that satisfies the normal operation of the industrial system.

3. The control method of an industrial backup power supply according to claim 1, characterized in that: The determining whether the voltage is in a stable state according to the first voltage information is specifically: Collecting and recording the first voltage information according to a preset time period; Select at least two of the first voltage information that are most recently collected and recorded to perform linear fitting to obtain first slope information; Determining whether the first slope information is within a preset slope range; If yes, it means that the first voltage information is in a stable state; The first slope information is the slope value of a straight line obtained by linearly fitting the first voltage information in a coordinate system established with time as the horizontal coordinate and voltage value as the vertical coordinate.

4. The control method of an industrial backup power supply according to claim 1, characterized in that: Also includes: The output levels of at least two pins are controlled according to the power supply mode, or a preset switch switching instruction is sent to control the analog switch.

Images