CN116488322B - Parallel low-voltage high-current output direct-current power supply device and control method - Google Patents
Parallel low-voltage high-current output direct-current power supply device and control method Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to the technical field of power supplies, in particular to a parallel low-voltage high-current output direct-current power supply device and a control method thereof. The low-cost reliable large-current output circuit with wide voltage range provided by the application can greatly reduce the fault rate and cost of the parallel power supply and improve the reliability of the parallel power supply while meeting the power supply requirement of load equipment by controlling the high-low voltage output switching circuit through collecting output voltage and current data by software.
Description
Technical Field
The application relates to the field of power control, in particular to a direct current power supply device with parallel voltage and large current output and a control method.
Background
The parallel direct current system is applied to hydraulic and thermal power plants, and various substations mainly comprise a parallel direct current power supply, a storage battery pack, a direct current feeder line screen, a direct current power supply monitoring device and the like, and a huge and distributed direct current power supply network is formed, so that safe and reliable working power supplies are provided for all subsystems such as a relay protection device, a breaker opening and closing device, a signal system, a UPS, communication and the like. The direct current system is an independent power supply, is not influenced by a generator, station service electricity and a system operation mode, and ensures that the backup power supply storage battery continuously provides important equipment of the direct current power supply under the condition of external alternating current interruption.
The index for evaluating the parallel power supply is based on the first principle of safety, reliability, power density and cost performance. Under the condition that the electrical technical index meets the normal use requirement, enough output current must be designed in order to ensure that the power supply provides safe and reliable working power for opening and closing of the circuit breaker under the severe environment and sudden fault conditions. At present, most of parallel power failures are caused by incapacity of bearing multiple output large currents, and because the switching-on and switching-off of a circuit breaker and the failure short circuit can enable the output current of the power supply to far exceed rated current and reach multiple times of the rated current, power components are disabled and the power supply fails.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a low-cost and reliable parallel low-voltage high-current output dc power supply device and control method, which can realize a wide-range high-current output circuit, greatly reduce the failure rate and cost of the parallel power supply, and improve the reliability of the parallel power supply.
In order to solve the technical problems, the embodiment of the application provides the following technical scheme:
the device comprises an alternating current input EMC module, an AC/DC power factor correction module, an alternating current working mode DC/DC low-voltage output module, an alternating current working mode DC/DC high-voltage output module, an intelligent charging module, a battery working mode DC/DC low-voltage output module, a battery working mode DC/DC high-voltage output module, a high-low voltage output switching controller, a signal sampling processing and control module, a storage battery and a direct current output EMC module;
the AC power factor correction module is connected with the AC working mode DC/DC low-voltage output module, the AC working mode DC/DC high-voltage output module and the intelligent charging module, and the intelligent charging module is connected with the battery working mode DC/DC high-voltage output module and the battery working mode DC/DC low-voltage output module through the storage battery;
the alternating current working mode DC/DC low-voltage output module, the alternating current working mode DC/DC high-voltage output module, the battery working mode DC/DC low-voltage output module and the battery working mode DC/DC high-voltage output module are respectively connected with the high-low voltage output switching controller, and the high-low voltage output switching controller is connected with the direct current output EMC module for output.
In one embodiment, when no ac input is performed, the storage battery pack is boosted by the battery working mode DC/DC low-voltage output module and the battery working mode DC/DC high-voltage output module, then connected to the high-low voltage output switching controller, and output to a load through the DC output EMC module.
In one embodiment, the high-low voltage output switching controller includes: the switching device comprises switching switches K1, K2, K3 and K4, a diode D1, a power resistor R1 and an electrolytic capacitor C1, wherein the switching switch K1 is connected with an alternating-current low-voltage output, the switching switch K2 is connected with an alternating-current high-voltage output, the switching switch K3 is connected with a battery low-voltage output, and the switching switch is connected with the battery high-voltage output.
In one embodiment, when the ac input is performed through the ac input EMC module, if the output voltage is greater than or equal to the set value, the switches K2 and K4 are engaged, and charge the large electrolytic capacitor C1 through the power resistor R1, and simultaneously supply power to the output load.
In one embodiment, when the ac input is performed through the ac input EMC module, if the output voltage is smaller than the set value, the switches K1 and K3 are engaged, and the large electrolytic capacitor C1 is charged through the power resistor R1, and simultaneously, power is supplied to the output load.
In one embodiment, the switches K1, K2, K3, K4 are connected in parallel, and then connected to the cathode of the diode D1, the anode of the diode D1 is connected to one end of the large electrolytic capacitor C1, the other end of the large electrolytic capacitor C1 is connected to the output end, one end of the power resistor R1 is connected to the anode of the diode D1, and the other end of the power resistor R1 is connected to the junction of the switches K3 and K4.
The application also provides a control method of the parallel low-voltage high-current output direct-current power supply, which is applied to the parallel low-voltage high-current output direct-current power supply, and comprises the following steps:
collecting the current output voltage and current data, and enabling output voltage and current samples to enter a high-low voltage output switching controller through A/D conversion;
judging whether the high-voltage output current limit value is reached, and if the output current is higher than the current set value in the high-voltage output process, reducing the output voltage; if the output current is not higher than the current set value in the high voltage output, the current voltage output is maintained.
In one embodiment, it is determined whether the voltage reaches a high-low voltage circuit switching point, and if the output voltage is lower than a high-low voltage circuit switching set point, the switch is made to a low-voltage high-current output circuit.
In one embodiment, determining whether the low voltage output current limit is reached, and if the output current is higher than the low voltage output current set point, reducing the output voltage; if the output current is not higher than the current set value in the low voltage output, the current voltage output is maintained.
According to the parallel type direct current power supply device with the low-voltage and high-current output, the high-voltage and low-voltage output circuits are integrated on the parallel power supply device, the circuit work is automatically switched, the high-voltage output function is kept, the low-voltage output current is greatly improved, and the technical effect of improving the power supply reliability of the parallel power supply device is achieved. The method of combining the high-voltage small-current output circuit and the low-voltage large-current output circuit is used for replacing the design of the high-voltage wide-range large-current output circuit, so that the technical effects of greatly reducing the design difficulty and saving the material cost are achieved, and the design cost of the circuit is greatly reduced.
And the design method combining the high-voltage small-current output circuit and the low-voltage large-current output circuit is used for replacing the design of the high-voltage wide-range large-current output circuit, so that the technical effects of reducing the volume of the power supply and providing the power density are achieved.
The application aims at solving the problems that in the prior art, when a breaker is switched on or output is short-circuited, the output current is required to exceed the rated current by several times, so that the power components are invalid and the power fails. The low-cost reliable large-current output circuit with wide voltage range provided by the application can greatly reduce the fault rate and cost of the parallel power supply and improve the reliability of the parallel power supply while meeting the power supply requirement of load equipment by controlling the high-low voltage output switching circuit through collecting output voltage and current data by software.
By implementing the technical scheme of the application, under the condition of ensuring normal output of the parallel power supply, the high-voltage output circuit and the low-voltage output circuit on the parallel power supply equipment are controlled to be automatically switched, so that the low-voltage output current is greatly improved, and the effects of improving the power supply reliability of the parallel power supply equipment, reducing the design difficulty, saving the material cost, reducing the power supply volume and improving the power density are achieved.
Drawings
FIG. 1 is a schematic diagram of an exemplary DC power supply device for parallel low voltage high current output of the present application;
FIG. 2 is a schematic diagram of an exemplary high and low voltage output switching controller of the present application;
fig. 3 is a schematic diagram of an exemplary dc power control method for parallel low voltage high current output of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In the embodiments of the present application, reference to "first," "second," etc. is used to distinguish between identical items or similar items that have substantially the same function and function, "at least one" means one or more, "a plurality" means two or more, for example, a plurality of objects means two or more. The words "comprise" or "comprising" and the like mean that information preceding the word "comprising" or "comprises" is meant to encompass the information listed thereafter and equivalents thereof as well as additional information not being excluded. Reference to "and/or" in embodiments of the application indicates that there may be three relationships, and the character "/" generally indicates that the associated object is an "or" relationship.
Referring to fig. 1, fig. 1 is an exemplary dc power supply device for parallel low-voltage high-current output according to the present application, as in fig. 1, the device includes:
the system comprises an alternating current input EMC module, an alternating current/DC power factor correction module, an alternating current working mode DC/DC low-voltage output module, an alternating current working mode DC/DC high-voltage output module, an intelligent charging module, a battery working mode DC/DC low-voltage output module, a battery working mode DC/DC high-voltage output module, a high-low voltage output switching controller, a signal sampling processing and control module, a storage battery pack and a direct current output EMC module;
the AC power factor correction module is connected with the AC working mode DC/DC low-voltage output module, the AC working mode DC/DC high-voltage output module and the intelligent charging module, and the intelligent charging module is connected with the battery working mode DC/DC high-voltage output module and the battery working mode DC/DC low-voltage output module through a storage battery;
the alternating current working mode DC/DC low-voltage output module, the alternating current working mode DC/DC high-voltage output module, the battery working mode DC/DC low-voltage output module and the battery working mode DC/DC high-voltage output module are respectively connected with the high-low voltage output switching controller, and the high-low voltage output switching controller is connected with the direct current output EMC module for output.
As an embodiment, when no ac input is performed, the storage battery pack is boosted by the battery working mode DC/DC low-voltage output module and the battery working mode DC/DC high-voltage output module, then connected to the high-low voltage output switching controller, and output to a load through the DC output EMC module.
The system comprises an H1 alternating current input EMC module, an H2 AC/DC power factor correction module, an H3 alternating current working mode DC/DC high-low voltage module, a high-low voltage output switching controller, an H11 direct current output EMC module and a load, wherein the alternating current enters the H1 alternating current input EMC module, enters the H2 AC/DC power factor correction module after exiting the EMC module, and part of power factor correction output enters the H3 alternating current working mode DC/DC high-low voltage module; and the other part of the battery is charged intelligently into H5, and the battery is charged intelligently into the H6 storage battery after being charged intelligently. The main functions of the modules are exemplified as follows:
h1 The method comprises the following steps The alternating current is input to EMC. The part realizes the functions of alternating current input filtering, lightning protection, interference resistance and the like.
H2 The method comprises the following steps AC/DC power factor correction. The power factor correction function is realized by the part, and the power factor correction function is realized, and the 370V direct current bus voltage is output, so that electric energy is provided for a DC/DC high-low voltage output circuit in an alternating current working mode and an intelligent charging part, and the power factor correction function is controlled by an H10 processor.
H3 The method comprises the following steps AC operation mode DC/DC high voltage output. The dc bus voltage from the pfc section 370V is converted to the high voltage required for output, which may be, for example, 50V or more, under the control of the H10 processor.
H4 The method comprises the following steps AC operation mode DC/DC low voltage output. The dc bus voltage from the pfc section 370V is converted to the high voltage required for output, which may be, for example, 50V or less, under the control of the H10 processor.
H5 The method comprises the following steps And (5) intelligent charging. The voltage of the 370V direct current bus from the power factor correction part is changed into the voltage required by the charging of the storage battery, and the storage battery is charged and controlled by the H10 processor.
H6 The method comprises the following steps And a storage battery. Store energy.
H7 The method comprises the following steps Battery mode DC/DC high voltage output. The voltage of the secondary battery is converted into a high voltage required for output, which can be, for example, 50V or more, and is controlled by an H10 processor.
H8 The method comprises the following steps Battery mode DC/DC low voltage output. The voltage from the battery is converted to the low voltage required for output, which may be, for example, less than 50V, under the control of the H10 processor.
H9 The method comprises the following steps And a high-low voltage output switching controller. The selection output of the high-low voltage output of the DC/DC in the alternating current working mode and the high-low voltage output of the DC/DC in the battery working mode is controlled by the H10 processor.
H10 The method comprises the following steps And (5) signal sampling processing and control. And the power factor correction module, the DC/DC power conversion module and the intelligent charging and storage battery pack related information are sampled, processed and controlled.
H11 The method comprises the following steps Direct current outputs EMC. The part realizes the functions of direct current output filtering, lightning protection and the like.
Referring to fig. 2, fig. 2 is an example high-low voltage output switching controller, as in fig. 2, as an example, the high-low voltage output switching controller includes: the switching device comprises switching switches K1, K2, K3 and K4, a diode D1, a power resistor R1 and an electrolytic capacitor C1, wherein the switching switch K1 is connected with alternating-current low-voltage output, the switching switch K2 is connected with alternating-current high-voltage output, the switching switch K3 is connected with battery low-voltage output, and the switching switch is connected with battery high-voltage output.
As an example, when ac input is performed through the ac input EMC module, if the output voltage is greater than or equal to the set value, the switches K2 and K4 are engaged, charge the large electrolytic capacitor C1 through the power resistor R1, and simultaneously supply power to the output load.
As an example, when ac input is performed through the ac input EMC module, if the output voltage is smaller than the set value, the switches K1 and K3 are engaged, charge the large electrolytic capacitor C1 through the power resistor R1, and simultaneously supply power to the output load.
As an embodiment, the switches K1, K2, K3, K4 are connected in parallel, and then connected to the cathode of the diode D1, the anode of the diode D1 is connected to one end of the large electrolytic capacitor C1, the other end of the large electrolytic capacitor C1 is connected to the output end, one end of the power resistor R1 is connected to the anode of the diode D1, and the other end of the power resistor R1 is connected to the junction of the switches K3 and K4.
In the above embodiment, when the ac is normal, the processor controls the switches K1, K2, K3, K4 according to the actual output voltage, and if the actual output voltage is greater than or equal to 50V, the switches K2 and K4 are attracted, and charge the large electrolytic capacitor C1 through the power resistor R1, and simultaneously supply power to the output load; if the actual output voltage is smaller than 50V, K1 and K3 are attracted, and the large electrolytic capacitor C1 is charged through the power resistor R1 and simultaneously supplies power to the output load. When the AC mode works, if the battery is normal, the actual high-low voltage output current can reach 2 times of the rated output current, the AC working mode and the battery working mode can both provide output current, and meanwhile, the large electrolytic capacitor C1 can provide instant impact current when a certain branch circuit is short-circuited, so that the current required by tripping of a circuit breaker is met, and the power module can be ensured to continuously supply power to loads of other branches. When the alternating current is abnormal, the processor controls the change-over switches K1, K2, K3 and K4 according to the actual output voltage, if the actual output voltage is greater than or equal to 50V, the K2 is disconnected from the K4 pull-in, and if the actual output voltage is less than 50V, the K1 is disconnected from the K3 pull-in. The electrolytic capacitor C1 functions as a filter, a transient voltage support, and provides a short circuit trip current.
Referring to fig. 3, fig. 3 is a schematic diagram of an exemplary dc power control method for parallel low-voltage high-current output according to the present application.
In the above embodiment, the control method includes:
collecting the current output voltage and current data, and enabling output voltage and current samples to enter a high-low voltage output switching controller through A/D conversion;
judging whether the high-voltage output current limit value is reached, and if the output current is higher than the current set value in the high-voltage output process, reducing the output voltage; if the output current is not higher than the current set value in the high voltage output, the current voltage output is maintained.
As an embodiment, the control method further includes:
judging whether the voltage reaches a switching point of the high-low voltage circuit, and if the output voltage is lower than a switching set value of the high-low voltage circuit, switching to the low-voltage high-current output circuit.
As an embodiment, the control method further includes:
judging whether the current limit value in low voltage output is reached, and if the output current is higher than the current set value in low voltage output, reducing the output voltage; if the output current is not higher than the current set value in the low voltage output, the current voltage output is maintained.
By way of example, the control method may include the steps of:
s1: initially, data is initialized. After the parallel power supply equipment is electrified, data such as PFC control, charging control, AC mode DC/DC high-low voltage output control, battery mode DC/DC high-low voltage output control, AC voltage sampling, battery voltage sampling, output current sampling, battery temperature and the like are initialized, and the equipment performs self-checking.
S2: and collecting current output voltage and current data. The output voltage and current samples are a/D converted into a controller.
S3: and judging whether the high-voltage output current limit value is reached. If the output current is higher than the current set value in the high voltage output, executing the step S4; if not, the output current is not higher than the current set value at the time of high voltage output, and then step S6 is executed. Taking 220v 4a rated output parallel power as an example, the high voltage output current limit may be set to 6A.
S4: the output voltage is reduced. Under the condition of unchanged output load, the output high-voltage control loop is regulated to reduce the output voltage so as to achieve the purposes of reducing the output current and protecting. Taking the 220V output voltage level as an example, the typical high voltage minimum regulation step is 10mV.
S5: and judging whether the voltage reaches a high-low voltage circuit switching point. If the output voltage is lower than the switching set value of the high-low voltage circuit, executing the step S7; if not, i.e. the output voltage is not lower than the high-low voltage circuit switching setting value, step S2 is performed. Taking 220V 4a rated output as an example, the high and low voltage circuit switching set point may be set to 50V.
S6: the current high voltage output is maintained. When the output current is not higher than the current set value at the time of high voltage output, the present voltage output is maintained, and then step S2 is performed.
S7: switching to a low voltage high current output circuit. When the output voltage is lower than the high-low voltage circuit switching setting value, the high-low voltage output switching controller switches to the low-voltage high-current output circuit, and then step S8 is performed.
S8: and judging whether the current limit value at the time of low-voltage output is reached. If the output current is higher than the current set value in low voltage output, executing step S9; if not, the output current is not higher than the low-voltage output current set point, and then step S10 is executed. Taking 220v 4A rated output as an example, the low voltage output current limit may be set to 24A.
S9: the output voltage is reduced. Under the condition of unchanged output load, the output low-voltage control loop is regulated to reduce the output voltage so as to achieve the purpose of reducing the output current. Taking the 220V output voltage level as an example, the minimum regulation step is typically 2mV.
S10: the current low voltage output is maintained. When the output current is not higher than the current set value of the low voltage output, the current voltage output is maintained, and then step S2 is executed to enter the next cycle.
The low-cost reliable large-current output circuit with wide voltage range provided by the application can greatly reduce the fault rate and cost of the parallel power supply and improve the reliability of the parallel power supply while meeting the power supply requirement of load equipment by controlling the high-low voltage output switching circuit through collecting output voltage and current data by software.
By implementing the technical scheme of the application, under the condition of ensuring normal output of the parallel power supply, the high-voltage output circuit and the low-voltage output circuit on the parallel power supply equipment are controlled to be automatically switched, so that the low-voltage output current is greatly improved, and the effects of improving the power supply reliability of the parallel power supply equipment, reducing the design difficulty, saving the material cost, reducing the power supply volume and improving the power density are achieved.
By integrating the high-voltage output circuit and the low-voltage output circuit on the parallel power supply equipment, the circuit works automatically and is switched, the low-voltage output current is greatly improved while the high-voltage output function is maintained, and the technical effect of improving the power supply reliability of the parallel power supply equipment is achieved.
The method of combining the high-voltage small-current output circuit and the low-voltage large-current output circuit is used for replacing the design of the high-voltage wide-range large-current output circuit, so that the technical effects of greatly reducing the design difficulty and saving the material cost, and the technical effects of reducing the volume of a power supply and providing the power density are achieved.
It should be further noted that the above-described apparatus embodiments are merely illustrative, and that the units described as separate units may or may not be physically separate, and that units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the application, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines.
From the above description of the embodiments, it will be apparent to those skilled in the art that the present application may be implemented by means of software plus necessary general purpose hardware, or of course by means of special purpose hardware including application specific integrated circuits, special purpose CPUs, special purpose memories, special purpose components, etc. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions can be varied, such as analog circuits, digital circuits, or dedicated circuits. However, a software program implementation is a preferred embodiment for many more of the cases of the present application. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk or an optical disk of a computer, etc., comprising several instructions for causing a computer device (which may be a personal computer, a training device, a network device, etc.) to perform the method according to the embodiments of the present application.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via a wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a training device, a data center, or the like that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.
The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (5)
1. The device comprises an alternating current input EMC module, an AC/DC power factor correction module, an alternating current working mode DC/DC low-voltage output module, an alternating current working mode DC/DC high-voltage output module, an intelligent charging module, a battery working mode DC/DC low-voltage output module, a battery working mode DC/DC high-voltage output module, a high-low voltage output switching controller, a signal sampling processing and control module, a storage battery and a direct current output EMC module;
the AC power factor correction module is connected with the AC working mode DC/DC low-voltage output module, the AC working mode DC/DC high-voltage output module and the intelligent charging module, and the intelligent charging module is connected with the battery working mode DC/DC high-voltage output module and the battery working mode DC/DC low-voltage output module through the storage battery;
the alternating current working mode DC/DC low-voltage output module, the alternating current working mode DC/DC high-voltage output module, the battery working mode DC/DC low-voltage output module and the battery working mode DC/DC high-voltage output module are respectively connected with the high-low voltage output switching controller, and the high-low voltage output switching controller is connected with the direct current output EMC module for output;
the high-low voltage output switching controller includes: the switching device comprises switching switches K1, K2, K3 and K4, a diode D1, a power resistor R1 and an electrolytic capacitor C1, wherein the switching switch K1 is connected with the AC working mode DC/DC low-voltage output module, the switching switch K2 is connected with the AC working mode DC/DC high-voltage output module, the switching switch K3 is connected with the battery working mode DC/DC low-voltage output module, and the switching switch K4 is connected with the battery working mode DC/DC high-voltage output module;
collecting the current output voltage and current data, and enabling output voltage and current samples to enter a high-low voltage output switching controller through A/D conversion;
judging whether the output current reaches a high-voltage output current limit value or not, and if the output current is higher than a current set value in high-voltage output, reducing the output voltage;
when alternating current input is carried out through the alternating current input EMC module, if the output voltage is greater than or equal to a set value, the switches K2 and K4 are attracted, the electrolytic capacitor C1 is charged through the power resistor R1, and meanwhile power is supplied to an output load;
when alternating current input is carried out through the alternating current input EMC module, if the output voltage is smaller than a set value, the switches K1 and K3 are attracted, the electrolytic capacitor C1 is charged through the power resistor R1, and meanwhile power is supplied to an output load.
2. The parallel low-voltage high-current output direct-current power supply device according to claim 1, wherein when no alternating current is input, the storage battery pack is connected to the high-low voltage output switching controller after being boosted by the battery working mode DC/DC low-voltage output module and the battery working mode DC/DC high-voltage output module, and is output to a load through the direct-current output EMC module.
3. The parallel low-voltage high-current output dc power supply device according to any one of claims 1-2, wherein the switches K1, K2, K3, K4 are connected in parallel, and connected in parallel to the negative electrode of the diode D1, the positive electrode of the diode D1 is connected to one end of the electrolytic capacitor C1, the other end of the electrolytic capacitor C1 is connected to the output terminal, one end of the power resistor R1 is connected to the positive electrode of the diode D1, and the other end of the power resistor R1 is connected to the junction between the switches K3 and K4.
4. A control method of a parallel low-voltage high-current output dc power supply, the control method being applied to the parallel low-voltage high-current output dc power supply device according to any one of claims 1 to 3, the control method comprising:
collecting the current output voltage and current data, and enabling output voltage and current samples to enter a high-low voltage output switching controller through A/D conversion;
judging whether the output current reaches a high-voltage output current limit value or not, and if the output current is higher than a current set value in high-voltage output, reducing the output voltage;
if the output current is not higher than the current set value in the high-voltage output, maintaining the current voltage output;
judging whether the voltage reaches a high-low voltage circuit switching set value, and if the output voltage is lower than the high-low voltage circuit switching set value, switching to the low-voltage high-current output circuit.
5. The control method for a dc power supply for parallel low-voltage high-current output according to claim 4, further comprising:
judging whether the current set value is reached to the low voltage output time, and if the output current is higher than the low voltage output time current set value, reducing the output voltage; if the output current is not higher than the current set value in the low voltage output, the current voltage output is maintained.
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| US8552588B2 (en) * | 2009-11-05 | 2013-10-08 | Tai-Her Yang | Battery charging coaction and output system with current limit supply |
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