CN114649825A - Power supply control circuit and electronic equipment - Google Patents
Power supply control circuit and electronic equipment Download PDFInfo
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- CN114649825A CN114649825A CN202210167552.6A CN202210167552A CN114649825A CN 114649825 A CN114649825 A CN 114649825A CN 202210167552 A CN202210167552 A CN 202210167552A CN 114649825 A CN114649825 A CN 114649825A
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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
- H02J3/381—Dispersed generators
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The embodiment of the application provides a power supply control circuit and electronic equipment, includes: the power supply system comprises a power grid power supply unit, an inversion unit, a first switch unit, a second switch unit and a processor. The power grid power supply unit is connected with one end of the first switch unit, the other end of the first switch unit is connected with a load, the first end of the inversion unit is connected with one end of the second switch unit, the other end of the second switch unit is connected with the load, and the processor is connected with the control end of the first switch unit, the control end of the second switch unit and the second end of the inversion unit. The processor is used for starting the inversion unit when the load is in a non-electricity state; detecting whether the output voltage of the inversion unit reaches a rated voltage value; and if the output voltage of the inversion unit reaches the rated voltage value, controlling the second switch unit to be closed, so that the inversion unit supplies power to the load through the second switch unit. Therefore, the power supply quality can be improved, and the load is not in an undervoltage state.
Description
Technical Field
The application relates to the technical field of inverter control, in particular to a power supply control circuit and electronic equipment.
Background
The quality and safety reliability of energy and power supply in the modern society are higher and higher, and the large power grid can not meet the requirements due to the defects of the large power grid. Disturbance generated by a fault at any point in a large power grid can have a large influence on the whole power grid, and a large-area power failure or even a whole grid breakdown can be caused when the disturbance is serious. Therefore, the combination of the large power grid system and the distributed power generation system is a main method for saving investment, reducing energy consumption and improving the safety and flexibility of the system. Distributed power generation refers to a system composed of small power generation devices, such as a wind power generation system and a solar power generation system, which are closer to a load end and have a smaller power generation capacity.
In the prior art, a distributed power generation system uses an inverter as an interface device for interacting with a large power grid. The power frequency inverter is an inverter which takes a power frequency transformer as isolation and can convert direct current into alternating current to supply power to a load, and the power frequency inverter is widely applied because the principle is simple, the output of the power frequency inverter does not contain direct current components, and the safety is high. However, because the power frequency transformer in the power frequency inverter has a remanence phenomenon, if the inverter is directly output with 100% output voltage when being started, the power frequency transformer can generate excitation surge current due to sudden change of voltage, and the excitation surge current may reach 80-100 times of steady-state excitation current and 6-8 times of rated current, so that the inverter can execute differential protection or overcurrent protection misoperation. Therefore, in order to avoid voltage sudden change, the output voltage of the power frequency inverter is usually gradually changed from small to large when the power frequency inverter is started, but the load is in an undervoltage state in the process of starting the inverter, and the requirement of a user cannot be met.
Disclosure of Invention
In view of this, the present application provides a power supply control circuit and an electronic device, so as to solve the problem that a load is under-voltage at the initial stage of power supply of an inverter in the prior art.
In a first aspect, an embodiment of the present application provides a power supply control circuit, which includes a power grid power supply unit, an inverter unit, a first switch unit, a second switch unit, and a processor, where the power grid power supply unit is connected to one end of the first switch unit, the other end of the first switch unit is connected to a load, a first end of the inverter unit is connected to one end of the second switch unit, the other end of the second switch unit is connected to the load, and the processor is connected to a control end of the first switch unit, a control end of the second switch unit, and a second end of the inverter unit;
the processor is further configured to detect whether the power grid power supply unit is in a normal state when the inverter unit supplies power to the load through the second switch unit;
and if the power grid power supply unit is in a normal state, controlling the first switch unit to be closed and the second switch unit to be disconnected so that the power grid power supply unit can supply power to the load through the first switch unit.
Preferably, the processor is further configured to perform phase locking if the grid power supply unit is in a normal state, so that the voltage value and the voltage phase of the output voltage of the inverter unit are the same as those of the output voltage of the grid power supply unit;
and if the phase locking is finished, controlling the first switch unit to be closed and the second switch unit to be opened so that the power grid power supply unit can supply power to the load through the first switch unit.
Preferably, the processor is further configured to the inverting unit including: a transformer, an inverter circuit; the inverter circuit includes: a third switch, a fourth switch, a fifth switch, a sixth switch and a capacitor; the first end of the transformer is connected with the first end of the third switch and the first end of the fourth switch, the second end of the third switch is connected with the first end of the fifth switch and the first end of the capacitor, the second end of the transformer is connected with the second end of the fifth switch and the first end of the sixth switch, the second end of the fourth switch is connected with the second end of the sixth switch and the second end of the capacitor, the third end of the transformer is connected with one end of the second switch unit, and the control ends of the third switch, the fourth switch, the fifth switch and the sixth switch are all connected with the processor.
Preferably, the processor is further configured to control the output voltage of the inverter unit to gradually decrease from a rated voltage value to a preset voltage value, so as to demagnetize the transformer;
and if the output voltage of the inversion unit is reduced to a preset voltage value, the inversion unit is turned off.
Preferably, the processor is further configured to control the output voltage of the inverting unit by controlling duty ratios of the third switch, the fourth switch, the fifth switch, and the sixth switch.
Preferably, the processor is further configured to detect whether the grid power supply unit is abnormal when the grid power supply unit supplies power to the load through the first switch unit;
and if the power grid power supply unit is detected to be abnormal, the first switch unit is controlled to be switched off, the second switch unit is controlled to be switched on, and the inversion unit is controlled to output voltage with a rated voltage value, so that the inversion unit supplies power to the load through the second switch unit.
Preferably, the first and second switching units may be relays.
In a second aspect, an embodiment of the present application provides an electronic device, including the power supply control circuit described in any one of the above first aspects.
The power supply control circuit provided by the embodiment of the application comprises a power grid power supply unit, an inverter unit, a first switch unit, a second switch unit and a processor. The power supply system comprises a power grid power supply unit, a first switch unit, a second switch unit, a processor, a load, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a fifth switch unit, a sixth switch unit, a fifth switch unit, a sixth switch unit, a fourth switch and a fourth switch unit, a fourth switch and a fourth switch unit, a fourth switch. The processor is used for starting the inversion unit when the load is in a non-electricity state; detecting whether the output voltage of the inversion unit reaches a rated voltage value; and if the output voltage of the inversion unit reaches the rated voltage value, controlling the second switch unit to be closed, so that the inversion unit supplies power to the load through the second switch unit. Therefore, after the inverter unit is started, the output voltage of the inverter unit gradually rises, and at the moment, if the inverter unit directly supplies power to the load, the load is in an under-voltage state, so that the processor detects whether the output voltage of the inverter unit reaches a rated voltage value, and if the output voltage of the inverter unit reaches the rated voltage value, the second switch unit is controlled to be closed, so that the inverter unit can supply power to the load by using the rated voltage, and the load is prevented from being in the under-voltage state.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a power supply control circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another power supply control circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another power supply control circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another power supply control circuit provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of another power supply control circuit according to an embodiment of the present application.
Detailed Description
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Before specifically describing the embodiments of the present application, terms applied or likely to be applied to the embodiments of the present application will be explained first.
Power frequency inverter: the converter is a direct current/alternating current (DC/AC) converter, and adopts a high-frequency pulse width modulation technology and a microcomputer control technology design to convert a direct current power supply of a battery pack into an alternating current power supply with stable output voltage and frequency.
A relay: the electric control device is an electric appliance which generates a predetermined step change in a controlled amount in an electric output circuit when a change in an input amount (excitation amount) meets a predetermined requirement. It has an interactive relationship between a control system (also called an input loop) and a controlled system (also called an output loop). It is usually applied in the automatic control circuit, which is actually an "automatic switch" that uses small current to control the operation of large current. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like.
Remanence: abbreviation of residual magnetization (reference). The power transformer is one of important components of a power grid, and plays an extremely important role in safe and stable operation of the power grid. The winding direct-current resistance test is an indispensable project in the routine test of transformer condition maintenance, and due to the hysteresis characteristic of ferromagnetic materials, residual magnetism in the transformer core is remained in the direct-current resistance test. Generally, the larger the current applied and the longer the current application time in the direct current resistance test, the larger the residual magnetism amount. Because of the existence of residual magnetism, when the transformer is put into operation, the residual magnetism of the iron core enables the half cycle of the transformer iron core to be saturated, a large amount of harmonic waves are generated in exciting current, and inrush current is formed, so that the reactive power consumption of the transformer is increased, and the misoperation and even damage of a relay protector can be caused, and economic loss is caused. At the same time, the high saturation of the core increases the magnetic flux leakage, causing overheating of the metallic structural parts and of the tank. Local overheating will age the insulation paper and break down transformer oil, affecting the life of the transformer. Therefore, the residual magnetism of the transformer core not only directly influences the operation safety of the winding, but also influences the stable and safe operation of the power system.
Degaussing: when the magnetized material is affected by external energy, such as heating and impact, the magnetic pitch directions of the magnetic domains become inconsistent, and the magnetism is weakened or lost, which is called degaussing. Another common method is: the material with magnetism is placed in an alternating current magnetic field, the alternating current magnetic field strength is gradually weakened until the alternating current magnetic field disappears, and the material is demagnetized.
In the related art, because a power frequency transformer in a power frequency inverter has a remanence phenomenon, if the inverter is directly output with 100% output voltage when being started, the power frequency transformer can generate excitation surge current due to sudden voltage change, and the excitation surge current can reach 80-100 times of steady-state excitation current and 6-8 times of rated current, so that the inverter can execute differential protection or overcurrent protection misoperation. Therefore, in order to avoid voltage sudden change, the output voltage of the power frequency inverter is usually gradually changed from small to large when the power frequency inverter is started, but the load is in an undervoltage state in the process of starting the inverter, and the requirement of a user cannot be met.
In view of the above problem, an embodiment of the present application provides a power supply control circuit, which includes a power grid power supply unit, an inverter unit, a first switch unit, a second switch unit, and a processor. The power supply system comprises a power grid power supply unit, a first switch unit, a second switch unit, a processor, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a fourth switch unit. The processor is used for starting the inversion unit when the load is in a non-electric state; detecting whether the output voltage of the inversion unit reaches a rated voltage value; and if the output voltage of the inversion unit reaches the rated voltage value, controlling the second switch unit to be closed, so that the inversion unit supplies power to the load through the second switch unit. So, after the contravariant unit starts, the output voltage of contravariant unit is at the gradual rising, if directly supply power to the load this moment, can make the load be in the undervoltage state, therefore the treater detects whether the output voltage of contravariant unit reaches rated voltage value, if the output voltage of contravariant unit reaches rated voltage value, then control the second switch unit closure for the inverter unit can be with the rated voltage to the load power supply, in order to avoid the load to be in the undervoltage state.
Referring to fig. 1, a schematic structural diagram of a power supply control circuit provided in an embodiment of the present application is shown. As shown in fig. 1, the power supply control circuit includes: the system comprises a power grid power supply unit 101, an inversion unit 102, a first switch unit 103, a second switch unit 104 and a processor 105.
The power grid power supply unit 101 is connected to one end of the first switch unit 103, the other end of the first switch unit 103 is connected to a load, the first end of the inverter unit 102 is connected to one end of the second switch unit 104, the other end of the second switch unit 104 is connected to the load, and the processor 105 is connected to the control end of the first switch unit 103, the control end of the second switch unit 104 and the second end of the inverter unit 102.
The processor 105 is used for starting the inverter unit 102 when the load is in a non-power state; detecting whether the output voltage of the inverter unit 102 reaches a rated voltage value; if the output voltage of the inverter unit 102 reaches the rated voltage value, the second switch unit 104 is controlled to be closed, so that the inverter unit 102 supplies power to the load through the second switch unit 104.
Specifically, in the power supply control circuit, one end of the power grid supply unit 101 is connected to the load through the first switch unit 103, the first end of the inverter unit 102 is connected to the load through the second switch unit 104, when the first switch unit 103 is controlled to be closed and the second switch unit is controlled to be opened, the power grid supply unit 101 supplies power to the load, and when the first switch unit is controlled to be opened and the second switch unit 104 is controlled to be closed, the inverter unit 102 can supply power to the load. The processor 105 is connected to the control end of the first switch unit 103, the control end of the second switch unit 104, and the second end of the inverter unit 102, and may control on/off of the first switch unit 103 and the second switch unit 104, or may detect an output voltage of the inverter unit 102. Because the excitation surge current is generated if the inverter unit 102 directly outputs the voltage with the rated voltage value, and the excitation surge current may reach 80-100 times of the steady-state excitation current and 6-8 times of the rated current, the inverter may perform differential protection or overcurrent protection malfunction, thereby affecting the normal operation of the inverter, in general, the output voltage of the inverter may gradually increase to the rated voltage, so as to avoid the generation of the excitation surge current. However, if the output voltage of the inverter unit 102 is lower than the rated voltage when supplying power to the load, the load may be in an under-voltage state, which may affect the use of the user. Therefore, when the load is in the non-power state, the processor 105 starts the inverter unit 102, controls the output voltage of the inverter unit 102 to gradually increase, and keeps both the first switch unit 103 and the second switch unit 104 in the off state. That is to say, after the inverter unit 102 is started, power is not directly supplied to the load, so as to prevent the load from being in an under-voltage state and affecting the use of the user. At this time, the processor 105 detects whether the output voltage of the inverter unit 102 reaches the rated voltage value, and controls the second switch unit 104 to be closed if the output voltage of the inverter unit 102 reaches the rated voltage value, and at this time, the inverter unit 102 supplies power to the load through the second switch unit 104. In this way, the inverter unit 102 may supply power to the load with the rated voltage value as the output voltage, and the load is not in an under-voltage state.
It should be noted that the rated voltage value is the rated output voltage value of the inverter unit 102, and when the inverter is started, the processor 105 may first determine the initial output voltage of the inverter unit 102, and control the output voltage of the inverter unit 102 to gradually increase from the initial output voltage to the rated voltage value, for example, the initial output voltage may be half of the rated voltage value, which is not limited in this application.
As a possible embodiment, the first switch unit 103 and the second switch unit 104 may be relays.
For example, the relay may be a double pole double throw relay, and may also be other relays, which the present application does not limit.
As a possible embodiment, the processor 105 is further configured to detect whether the grid power supply unit 101 is in a normal state when the inverter unit 102 supplies power to the load through the second switch unit 104;
if the grid power supply unit 101 is in a normal state, the first switch unit 103 is controlled to be closed, and the second switch unit 104 is controlled to be opened, so that the grid power supply unit 101 can supply power to the load through the first switch unit 103.
Specifically, when the inverter unit 102 supplies power to the load through the second switch unit 104, if it is necessary to switch to the power grid power supply unit 101 to supply power to the load, the processor 105 may detect whether the power grid power supply unit 101 is in a normal state, and if the power grid power supply unit 101 is in a normal state, that is, when the power grid power supply unit 101 is not in a fault or is otherwise abnormal, the first switch unit 103 is controlled to be closed, the second switch unit 104 is controlled to be opened, and at this time, the power grid power supply unit 101 may supply power to the load through the first switch unit 103.
Further, the processor 105 is further configured to perform phase locking if the grid power supply unit 101 is in a normal state, so that the voltage value and the voltage phase of the output voltage of the inverter unit 102 are the same as those of the output voltage of the grid power supply unit 101;
if the phase locking is completed, the first switch unit 103 is controlled to be closed, and the second switch unit 104 is controlled to be opened, so that the power grid supply unit 101 can supply power to the load through the first switch unit 103.
In the embodiment of the present application, if the output voltage of the inverter unit is not consistent with the output voltage of the grid power supply unit 101, when the power supply of the inverter unit is switched to the power supply of the grid power supply unit 101, the voltage at the input end of the load may be suddenly changed, which affects the normal operation of the load. Therefore, when detecting that the grid power supply unit 101 is in a normal state, the processor 105 needs to adjust the output voltage of the inverter to be consistent with the output voltage of the grid power supply unit 101, and then perform power supply switching. Since the output voltage of the inverter unit and the output voltage of the grid power supply unit 101 are both ac voltages, it is necessary to adjust the output voltage of the inverter unit 102 to be the same as the output voltage of the grid power supply unit 101 in terms of voltage value and voltage phase. At this time, the processor 105 may control the inverter unit 102 to lock the phase, so that the voltage value and the voltage phase of the output voltage of the inverter unit 102 are the same as those of the output voltage of the grid power supply unit 101, for example, the voltage phase of the output voltage of the grid power supply unit 101 and that of the output voltage of the inverter unit 102 are first calculated, and the phase difference between the voltage of the grid power supply unit 101 and the output voltage of the inverter unit 102 is calculated by a subtractor, and the phase-locked controller may be a PID (proportional integral derivative) or other controller, and outputs a phase adjustment amount by using the phase difference, so as to control the voltage phase of the output voltage of the inverter unit 102. When the phase locking is completed, it is described that the voltage value and the voltage phase of the output voltage of the inverter unit 102 are the same as those of the output voltage of the power grid supply unit 101, and at this time, the processor 105 controls the first switch unit 103 to be closed and controls the second switch unit 104 to be opened, so as to switch to the power grid supply unit 101 to supply power to the load through the first switch unit 103.
As a possible implementation manner, as shown in fig. 2, the inverting unit 102 includes: a transformer T and an inverter circuit; the inverter circuit includes: a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6 and a capacitor C. A first terminal of the transformer T is connected to the first terminal of the third switch Q3 and the first terminal of the fourth switch Q4, a second terminal of the third switch Q3 is connected to the first terminal of the fifth switch Q5 and the first terminal of the capacitor C, a second terminal of the transformer T is connected to the second terminal of the fifth switch Q5 and the first terminal of the sixth switch Q6, a second terminal of the fourth switch Q4 is connected to the second terminal of the sixth switch Q6 and the second terminal of the capacitor C, a third terminal of the transformer T is connected to one terminal of the second switch unit 104, and control terminals of the third switch Q3, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are all connected to the processor 105.
Specifically, the inverter unit 102 includes an inverter circuit and a transformer T. The inverter circuit includes: a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6 and a capacitor C. A first terminal of the transformer T is connected to the first terminal of the third switch Q3 and the first terminal of the fourth switch Q4, a second terminal of the third switch Q3 is connected to the first terminal of the fifth switch Q5 and the first terminal of the capacitor C, a second terminal of the transformer T is connected to the second terminal of the fifth switch Q5 and the first terminal of the sixth switch Q6, a second terminal of the fourth switch Q4 is connected to the second terminal of the sixth switch Q6 and the second terminal of the capacitor C, a third terminal of the transformer T is connected to one terminal of the second switch unit 104, and control terminals of the third switch Q3, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are all connected to the processor 105. The inverter circuit may convert dc power provided by a power source to ac power to power a load, such as a dry cell battery, a solar power source, or the like. The transformer T can play the role of isolation, can effectively filter out the harmonic wave that power device in the inverter circuit produced to when the abnormal conditions appeared in the electric wire netting, can avoid damaging the problem of the components and parts among the inverter circuit.
In the circuit shown in fig. 2, the first switch unit 103 and the second switch unit 104 are both exemplified by a double-pole double-throw relay, that is, the first switch unit 103 is a first switch K1, and the second switch unit 104 is a second switch K2. Of course, the first switch unit 103 and the second switch unit 104 may also be other relays, which is not limited in this application.
As a possible implementation manner, the processor 105 is further configured to control the output voltage of the inverting unit 102 to gradually decrease from the rated voltage value to a preset voltage value, so as to demagnetize the transformer T;
if the output voltage of the inverter unit 102 has decreased to the predetermined voltage value, the inverter unit 102 is turned off.
Specifically, since the transformer T in the inverter unit 102 is in operation, a steady-state magnetic flux is generated therein. When the transformer T is cut off in a power failure, because the loop magnetic flux is conserved, the steady-state magnetic flux cannot disappear immediately, and a residual magnetism which is equal to the steady-state magnetic flux at the last moment in magnitude and has the same polarity is reserved. If the voltage is output at the rated voltage value when the inverter unit 102 is restarted, the transformer T may cause an excitation surge current due to sudden voltage change, so that the inverter unit 102 generates a protection malfunction, and therefore, after the power supply is switched to the grid power supply unit 101 for power supply, the transformer T needs to be demagnetized to avoid the excitation surge current generated when the power supply is switched to the inverter unit 102 next time. Because the inverter unit 102 outputs the alternating current, and the transformer can be demagnetized by applying the adjustable alternating current to the transformer, the output voltage of the inverter unit 102 can be controlled to gradually step down from the rated voltage value to the preset voltage value, in the process, the transformer T can be demagnetized, when the output voltage of the inverter unit 102 is reduced to the preset voltage value, the transformer is demagnetized, and at the moment, the inverter unit 102 is turned off. In this way, when the inverter unit 102 is restarted, since the transformer T is demagnetized, when the output voltage of the inverter unit 102 is the rated voltage value, no magnetizing inrush current is generated, and therefore the processor 105 can control the inverter unit 102 to directly supply power to the load at the rated voltage value without closing the second switching unit 104 after controlling the output voltage of the inverter unit 102 to gradually increase to the rated voltage value.
It should be noted that the preset voltage value may be a half of the rated voltage value, and may also be other values, which is not limited in this application.
Further, the processor 105 is further configured to control the output voltage of the inverter unit 102 by controlling duty ratios of the third switch Q3, the fourth switch Q4, the fifth switch Q5, and the sixth switch Q6.
As a possible implementation manner, the processor 105 is further configured to detect whether an abnormality occurs in the grid power supply unit 101 when the grid power supply unit 101 supplies power to the load through the first switch unit 103;
if the power grid power supply unit 101 is detected to be abnormal, the first switch unit 103 is controlled to be switched off, the second switch unit 104 is controlled to be switched on, and the inverter unit 102 is controlled to output voltage with a rated voltage value, so that the inverter unit 102 supplies power to the load through the second switch unit 104.
Specifically, when the grid power supply unit 101 supplies power to the load through the first switch unit 103, in order to prevent a safety accident caused by a fault of the grid power supply unit 101, whether the grid power supply unit 101 is abnormal is detected, and if the grid power supply unit 101 is detected to be abnormal, it is indicated that the inversion unit 102 needs to be switched to supply power to the load. At this time, the processor 105 controls the first switch unit 103 to be opened and the second switch unit to be closed, so that the inverter unit 102 supplies power to the load through the second switch unit 104. And since the transformer T is demagnetized, the processor 105 may directly control the inverter unit 102 to supply power to the load at the rated voltage value output voltage while controlling the first switching unit 103 to be open and the second unit to be closed.
For example, as shown in fig. 2, it is assumed that the first switch unit 103 and the second switch unit 104 are both double-pole double-throw relays, that is, the first switch unit 103 is a first switch K1, and the second switch unit 104 is a second switch K2. The processor 105 starts the inverter unit 102 when the load is in a non-power state, and detects whether the output voltage of the inverter unit 102 reaches a rated voltage value. If the output voltage of the inverter unit 102 reaches the rated voltage value, the second switch K2 is controlled to be closed, as shown in fig. 3, and at this time, the inverter unit 102 supplies power to the load through the second switch K2. Then, the processor 105 may detect whether the grid power supply unit 101 is in a normal state, and if it is detected that the grid power supply unit 101 is not abnormal, the grid power supply unit is in the normal state, which indicates that the grid may supply power to the load. In order to keep the output voltage of the inverter unit 102 consistent with the output voltage of the grid power supply unit 101, the processor 105 controls the inverter unit 102 to perform phase locking at this time, so that the voltage value and the voltage phase of the output voltage of the inverter unit 102 are the same as those of the output voltage of the grid power supply unit 101. After the phase locking is completed, as shown in fig. 4, the first switch K1 is controlled to be closed, and the second switch K2 is controlled to be opened, so that the grid power supply unit 101 can supply power to the load through the first switch K1. Because the transformer T of the inverter unit 102 generates residual magnetism during the operation process, in order to avoid the residual magnetism from causing the inverter unit 102 to protect false operation when the inverter unit 102 is restarted, after the first switch K1 is controlled to be closed and the second switch K2 is controlled to be opened, the processor 105 can control the output voltage of the inverter unit 102 to be gradually reduced from the rated output voltage to the preset voltage value by adjusting the duty ratio of each switch in the inverter circuit, so as to complete the demagnetization of the transformer T. Because the power grid power supply unit 101 may be abnormal in the operation process, causing a power supply safety accident, the processor 105 may detect whether the power grid power supply unit 101 is abnormal when the power grid power supply unit 101 supplies power to a load, and if it is detected that the power grid power supply unit 101 is abnormal, it needs to switch to the inverter unit 102 to supply power to the load. At this time, as shown in fig. 5, the processor 105 controls the first switch K1 to be opened and the second switch K2 to be closed, so that the inverter unit 102 supplies power to the load, and since the transformer T in the inverter unit 102 is demagnetized, the processor 105 may directly control the inverter unit 102 to output voltage at the rated voltage value and supply power to the load.
Corresponding to the above embodiments, the present application further provides an electronic device, which may include the power supply control circuit described in any of the above embodiments.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts among the various embodiments in this specification may be referred to each other. Especially, as for the device embodiment and the terminal embodiment, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant points can be referred to the description in the method embodiment.
Claims (9)
1. A power supply control circuit is characterized by comprising a power grid power supply unit, an inversion unit, a first switch unit, a second switch unit and a processor, wherein the power grid power supply unit is connected with one end of the first switch unit, the other end of the first switch unit is connected with a load, the first end of the inversion unit is connected with one end of the second switch unit, the other end of the second switch unit is connected with the load, and the processor is connected with a control end of the first switch unit, a control end of the second switch unit and the second end of the inversion unit;
the processor is used for starting the inversion unit when the load is in a non-electricity state; detecting whether the output voltage of the inversion unit reaches a rated voltage value; and if the output voltage of the inverter unit reaches a rated voltage value, controlling the second switch unit to be closed, so that the inverter unit supplies power to the load through the second switch unit.
2. The circuit of claim 1,
the processor is further configured to detect whether the power grid power supply unit is in a normal state when the inverter unit supplies power to the load through the second switch unit;
and if the power grid power supply unit is in a normal state, controlling the first switch unit to be closed and the second switch unit to be opened so that the power grid power supply unit can supply power to the load through the first switch unit.
3. The circuit of claim 2,
the processor is further configured to perform phase locking if the power grid supply unit is in a normal state, so that the voltage value and the voltage phase of the output voltage of the inverter unit are the same as those of the output voltage of the power grid supply unit;
and if the phase locking is finished, controlling the first switch unit to be closed and the second switch unit to be opened so that the power grid power supply unit can supply power to the load through the first switch unit.
4. The circuit of claim 1, wherein the inverting unit comprises: a transformer, an inverter circuit; the inverter circuit includes: a third switch, a fourth switch, a fifth switch, a sixth switch and a capacitor; the first end of the transformer is connected with the first end of the third switch and the first end of the fourth switch, the second end of the third switch is connected with the first end of the fifth switch and the first end of the capacitor, the second end of the transformer is connected with the second end of the fifth switch and the first end of the sixth switch, the second end of the fourth switch is connected with the second end of the sixth switch and the second end of the capacitor, the third end of the transformer is connected with one end of the second switch unit, and the control ends of the third switch, the fourth switch, the fifth switch and the sixth switch are all connected with the processor.
5. The circuit of claim 4,
the processor is further used for controlling the output voltage of the inverter unit to be gradually reduced from a rated voltage value to a preset voltage value so as to demagnetize the transformer;
and if the output voltage of the inversion unit is reduced to a preset voltage value, the inversion unit is turned off.
6. The circuit of claim 5,
the processor is further used for controlling the output voltage of the inversion unit by controlling the duty ratio of the third switch, the fourth switch, the fifth switch and the sixth switch.
7. The circuit of claim 6,
the processor is further configured to detect whether the power grid supply unit is abnormal when the power grid supply unit supplies power to the load through the first switch unit;
and if the power grid power supply unit is detected to be abnormal, the first switch unit is controlled to be switched off, the second switch unit is controlled to be switched on, and the inversion unit is controlled to output voltage with a rated voltage value, so that the inversion unit supplies power to the load through the second switch unit.
8. The circuit of claim 4, wherein the first and second switch units are relays.
9. An electronic device characterized by comprising the power supply control circuit according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210167552.6A CN114649825A (en) | 2022-02-23 | 2022-02-23 | Power supply control circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210167552.6A CN114649825A (en) | 2022-02-23 | 2022-02-23 | Power supply control circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317077A (en) * | 2022-12-30 | 2023-06-23 | 深圳麦格米特电气股份有限公司 | Control method, controller and storage medium for switching power supply of electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317077A (en) * | 2022-12-30 | 2023-06-23 | 深圳麦格米特电气股份有限公司 | Control method, controller and storage medium for switching power supply of electronic equipment |
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