CN116742770A - Low-voltage high-current output system and method for parallel direct-current power supply - Google Patents
Low-voltage high-current output system and method for parallel direct-current power supply Download PDFInfo
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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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Abstract
The invention provides a low-voltage high-current output system and a method for a parallel direct-current power supply, comprising the following steps: the system comprises a storage battery pack, a DC/DC low-voltage high-current output circuit, a DC/DC high-voltage low-current output circuit, a high-low-voltage output switching controller and a signal sampling processing control module; the DC/DC low-voltage high-current output circuit is connected with the storage battery pack; the DC/DC high-voltage small-current output circuit is connected with the storage battery pack; the signal sampling processing control module is connected with the storage battery pack and the high-low voltage output switching controller; the high-low voltage output switching controller is connected with the DC/DC low-voltage high-current output circuit and the DC/DC high-voltage low-current output circuit; according to the invention, the DC/DC high-voltage small-current output circuit and the DC/DC low-voltage large-current output circuit are integrated on the parallel power supply equipment, so that the circuit can be automatically switched in operation, the low-voltage output current can be greatly improved while the high-voltage output is maintained, the power supply reliability is improved, and the power supply fault is avoided; the system provided by the invention can greatly reduce the design difficulty of the parallel direct current power supply and save the cost.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a low-voltage high-current output system and method for a parallel direct-current power supply.
Background
The parallel direct current power supply is applied to hydraulic power plants, thermal power plants and various substations, and provides safe and reliable working power for various subsystems such as a relay protection device, a breaker switching-on/off switch, a signal system, an uninterruptible power supply UPS, communication and the like. The parallel direct current power supply 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 pack continuously provides the direct current power supply under the condition of external alternating current interruption.
The indexes for evaluating the parallel direct current power supply include safety, reliability, power density, cost performance and the like, and under the condition that the electrical technical indexes meet the normal use requirements, enough output current is required to be designed in order to provide a safe and reliable working power supply for switching on and off of the circuit breaker under severe environment and sudden fault conditions. The switching-on and switching-off of the circuit breaker in the existing parallel power supply can enable the output current of the power supply to far exceed the rated current and even reach several times of the rated current, so that power components are invalid, power failure is formed, and the power supply cannot bear several times of output large current. Therefore, a large-current output circuit with a wide voltage range is needed to reduce the failure rate and cost of the parallel dc power supply and improve the reliability of the parallel dc power supply.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a low-voltage high-current output system of a parallel direct-current power supply, which comprises: the system comprises a storage battery pack, a DC/DC low-voltage high-current output circuit, a DC/DC high-voltage low-current output circuit, a high-low-voltage output switching controller and a signal sampling processing control module;
the DC/DC low-voltage high-current output circuit is connected with the storage battery pack and is used for outputting low-voltage high current;
the DC/DC high-voltage small-current output circuit is connected with the storage battery pack and is used for outputting high-voltage small current;
the signal sampling processing control module is connected with the storage battery pack and the high-low voltage output switching controller and is used for collecting output voltage and output current of the storage battery pack and sending a switching instruction to the high-low voltage output switching controller based on the collected output voltage and output current; and the output voltage of the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit is regulated;
the high-low voltage output switching controller is connected with the DC/DC low-voltage high-current output circuit and the DC/DC high-voltage low-current output circuit and is used for switching the low-voltage high-current output circuit or the high-voltage low-current output circuit to work according to a switching instruction sent by the signal sampling processing control module;
the output voltage of the low-voltage high current is lower than a set switching voltage value, and the output current is higher than a high-current set limit value;
the output voltage of the high-voltage small current is higher than a set switching voltage value and the output current is lower than a small current set limit value.
Preferably, the high-low voltage output switching controller is further connected with a load, and is used for providing direct current output by the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit for the load to work.
Based on the same inventive concept, the invention also provides a method for outputting low-voltage and high-current of the parallel direct-current power supply, wherein the method adopts the parallel direct-current power supply low-voltage and high-current output system to output low-voltage and high-current, and comprises the following steps:
the method comprises the steps of collecting output voltage and output current of a storage battery pack through a signal sampling processing control module, adjusting output voltage of a DC/DC high-voltage small-current output circuit and a DC/DC low-voltage large-current output circuit according to set conditions based on the collected output voltage and output current, and sending a switching instruction to a high-voltage output switching controller and a low-voltage output switching controller;
the high-low voltage output switching controller is used for switching the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit to work according to the switching instruction sent by the signal sampling processing control module;
the output voltage is changed through the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit under the adjustment of the signal sampling processing control module, and the direct current is output.
Preferably, the signal sampling processing control module collects output voltage and output current of the storage battery pack, and adjusts the DC/DC high-voltage low-current output circuit according to a set condition based on the collected output voltage and output current, and the signal sampling processing control module comprises:
s1, collecting output voltage and output current of a storage battery pack through a signal sampling processing control module, and judging whether the output current is higher than a small current set limit value or not;
s2, if yes, executing a high-voltage step-down step; otherwise, the output voltage is maintained.
Preferably, the high-pressure reducing step includes:
s3, controlling a DC/DC high-voltage small-current output circuit to reduce output voltage through a signal sampling processing control module, and judging whether the output voltage is lower than a set switching voltage value or not;
s4, if yes, executing a circuit switching step; otherwise, the output voltage is maintained.
Preferably, when a parallel direct current power supply having a rated output voltage of 220V and a rated output current of 4A is used, the small current setting limit value of the DC/DC high voltage small current output circuit is 6A.
Preferably, the circuit switching step includes:
s5, sending a command for switching to the DC/DC low-voltage high-current output circuit to the high-low-voltage output switching controller through the signal sampling processing control module, and judging whether the output current is higher than a high-current set limit value;
s6, if yes, the DC/DC low-voltage high-current output circuit is controlled to reduce the output voltage and maintain the output voltage through the signal sampling processing control module; otherwise, the output voltage is maintained.
Preferably, when a parallel direct current power supply having a rated output voltage of 220V and a rated output current of 4A is used, the large current setting limit value of the DC/DC low voltage large current output circuit is 24A.
Preferably, when a parallel direct current power supply with an output voltage of 220V is used, the minimum step of the decrease of the output voltage of the DC/DC low voltage high current output circuit is 2mV.
Preferably, when using a parallel direct current power supply with an output voltage of 220V, the minimum step of the DC/DC high voltage low current output circuit output voltage drop is 10mV.
Preferably, when a parallel direct current power supply having a rated output voltage of 220V and a rated output current of 4A is used, the set switching voltage value of the DC/DC low-voltage large-current output circuit and the DC/DC high-voltage small-current output circuit is 50V.
Preferably, after the output voltage and the output current of the storage battery pack are collected by the signal sampling processing control module, before the output voltages of the DC/DC high-voltage low-current output circuit and the DC/DC low-voltage high-current output circuit are adjusted according to the set sequence based on the collected output voltage and the collected output current, the method further comprises:
and carrying out A/D conversion on the acquired output voltage and output current to obtain digital signals of the output voltage and the output current.
Preferably, before the signal sampling processing control module collects the output voltage and the output current of the storage battery pack, the method further includes: system initialization and system self-checking.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides a low-voltage high-current output system and a method for a parallel direct-current power supply, comprising the following steps: the system comprises a storage battery pack, a DC/DC low-voltage high-current output circuit, a DC/DC high-voltage low-current output circuit, a high-low-voltage output switching controller and a signal sampling processing control module; the DC/DC low-voltage high-current output circuit is connected with the storage battery pack and is used for outputting low-voltage high current; the DC/DC high-voltage small-current output circuit is connected with the storage battery pack and is used for outputting high-voltage small current; the signal sampling processing control module is connected with the storage battery pack and the high-low voltage output switching controller and is used for collecting output voltage and output current of the storage battery pack and sending a switching instruction to the high-low voltage output switching controller based on the collected output voltage and output current; and the output voltage of the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit is regulated; the high-low voltage output switching controller is connected with the DC/DC low-voltage high-current output circuit and the DC/DC high-voltage low-current output circuit and is used for switching the low-voltage high-current output circuit or the high-voltage low-current output circuit to work according to a switching instruction sent by the signal sampling processing control module; the output voltage of the low-voltage high current is lower than a set switching voltage value, and the output current is higher than a high-current set limit value; the output voltage of the high-voltage small current is higher than a set switching voltage value, and the output current is lower than a small current set limit value; according to the invention, the DC/DC high-voltage small-current output circuit and the DC/DC low-voltage large-current output circuit are integrated on the parallel power supply equipment, so that the circuit can be automatically switched in operation, the low-voltage output current can be greatly improved while the high-voltage output is maintained, the power supply reliability of the parallel power supply equipment is improved, and the occurrence of power failure is avoided; the invention replaces the design of the high-voltage wide-range large-current output circuit by a method of combining the DC/DC high-voltage small-current output circuit and the DC/DC low-voltage large-current output circuit, thereby greatly reducing the design difficulty and saving the cost.
The method for combining the DC/DC high-voltage small-current circuit and the DC/DC low-voltage large-current output circuit can reduce the volume of a power supply and improve the power density.
Drawings
FIG. 1 is a schematic diagram of the connection relationship of a low-voltage high-current output system of a parallel DC power supply;
FIG. 2 is a schematic flow chart of a method for outputting a high-voltage and a high-current of a parallel DC power supply;
FIG. 3 is a high-low voltage output switching flow chart of an embodiment of a method for outputting a high-voltage and a high-current of a parallel DC power supply;
FIG. 4 is a schematic diagram of a parallel DC power supply structure designed based on a system and method for outputting a high-voltage and a high-current of a parallel DC power supply according to the present invention;
reference numerals illustrate: the system comprises a 1-alternating current input EMC module, a 2-alternating current/DC power factor correction module, a 3-alternating current working mode DC/DC high-voltage output circuit, a 4-alternating current working mode DC/DC low-voltage output circuit, a 5-intelligent charging module, a 6-storage battery pack, a 7-battery working mode DC/DC high-voltage output circuit, a 8-battery working mode DC/DC low-voltage output circuit, a 9-high-low voltage output switching controller, a 10-signal sampling processing control module and a 11-direct current output EMC module.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Example 1:
the invention provides a low-voltage high-current output system of a parallel direct-current power supply, the connection relation diagram of which is shown in figure 1, comprising: the system comprises a storage battery pack, a DC/DC low-voltage high-current output circuit, a DC/DC high-voltage low-current output circuit, a high-low-voltage output switching controller and a signal sampling processing control module;
the DC/DC low-voltage high-current output circuit is connected with the storage battery pack and is used for outputting low-voltage high current;
the DC/DC high-voltage small-current output circuit is connected with the storage battery pack and is used for outputting high-voltage small current;
the signal sampling processing control module is connected with the storage battery pack and the high-low voltage output switching controller and is used for collecting output voltage and output current of the storage battery pack and sending a switching instruction to the high-low voltage output switching controller based on the collected output voltage and output current; and the output voltage of the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit is regulated;
the high-low voltage output switching controller is connected with the DC/DC low-voltage high-current output circuit and the DC/DC high-voltage low-current output circuit and is used for switching the low-voltage high-current output circuit or the high-voltage low-current output circuit to work according to a switching instruction sent by the signal sampling processing control module;
the output voltage of the low-voltage high current is lower than a set switching voltage value, and the output current is higher than a high-current set limit value;
the output voltage of the high-voltage small current is higher than a set switching voltage value and the output current is lower than a small current set limit value.
The high-low voltage output switching controller is also connected with a load and used for providing direct current output by the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit for the load to work.
Example 2:
the invention provides a method for outputting low-voltage and large-current of a parallel direct-current power supply, which adopts the system for outputting low-voltage and large-current of the parallel direct-current power supply, and a flow chart is shown in figure 2, and comprises the following steps:
step 1: the method comprises the steps of collecting output voltage and output current of a storage battery pack through a signal sampling processing control module, adjusting output voltage of a DC/DC high-voltage small-current output circuit and a DC/DC low-voltage large-current output circuit according to set conditions based on the collected output voltage and output current, and sending a switching instruction to a high-voltage output switching controller and a low-voltage output switching controller;
step 2: the high-low voltage output switching controller is used for switching the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit to work according to the switching instruction sent by the signal sampling processing control module;
step 3: the output voltage is changed through the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit under the adjustment of the signal sampling processing control module, and the direct current is output.
In this embodiment, the steps 1 to 3 are specifically divided into the following 10 steps, as shown in fig. 3:
s1, starting and initializing data. After the parallel power supply equipment (namely a parallel direct current power supply) 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-inspection.
S2, collecting current output voltage and current data. The data of the current output voltage and output current of the storage battery are subjected to A/D conversion (analog signals are converted into digital signals), and are collected by a signal sampling processing control module.
And S3, judging whether the output current reaches a high-voltage output current limit value (namely a small current set limit value). It is determined whether the output current is above a high voltage output current limit. If yes, jumping to the step S4; otherwise, go to step S6. Taking the parallel power supply with 220v 4a rated output as an example, the high voltage output current limit value can be set to 6A.
S4, reducing the output voltage. Under the condition of unchanged output load, the DC/DC high-voltage small-current output circuit is regulated, and the output voltage is reduced, so that the purposes of reducing the output current and protecting the power supply are achieved. Taking a 220V output voltage class parallel power supply as an example, the minimum step of the output voltage reduction of the DC/DC high voltage low current output circuit is 10mV.
S5, judging whether the voltage reaches a high-low voltage circuit switching point. It is determined whether the output voltage is lower than the set value of the high-low voltage output switching (i.e., the set switching voltage value). If yes, jumping to the step S7; otherwise, the process goes to step S2. Taking 220V 4a rated output parallel power supply as an example, the set value for switching the high-low voltage output can be set to 50V.
S6, maintaining the current high-voltage output. When the output current is not higher than the high voltage output current limit value, the present voltage output is maintained, and step S2 is performed.
S7, switching to the DC/DC low-voltage high-current output circuit. When the output voltage is lower than the setting value of the high-low voltage output switching, switching to the DC/DC low voltage high current output circuit by the high-low voltage output switching controller, and executing step S8.
S8, judging whether the low-voltage output current limit value (namely, the large current set limit value) is reached. It is determined whether the output current is above a low voltage output current limit. If yes, executing step S9; otherwise, step S10 is performed. Taking the parallel power supply rated for 220v 4A as an example, the low voltage output current limit may be set to 24A.
S9, reducing the output voltage. Under the condition of unchanged output load, the DC/DC low-voltage high-current output circuit is regulated, and the output voltage is reduced, so that the purposes of reducing the output current and protecting the power supply are achieved. Taking a 220V output voltage class parallel power supply as an example, the minimum step of the output voltage reduction of the DC/DC low voltage high current output circuit is 2mV.
S10, maintaining the current low-voltage output. When the output current is not higher than the low-voltage output current limit value, the present voltage output is maintained, and step S2 is performed. When the parallel DC power supply outputs a high voltage and a small current, the next cycle is started.
The invention integrates a high-voltage output circuit and a low-voltage output circuit (namely a DC/DC high-voltage small-current output circuit and a DC/DC low-voltage large-current output circuit) on the parallel direct-current power supply equipment, so that the circuit can be automatically switched in operation, the high-voltage output function is maintained, the low-voltage output current is greatly improved, and the technical effect of improving the power supply reliability of the parallel power supply equipment is achieved. The invention replaces the design of the traditional high-voltage wide-range large-current output circuit by using the method of combining the DC/DC high-voltage small-current output circuit and the DC/DC low-voltage large-current output circuit, thereby achieving the technical effects of greatly reducing the design difficulty and saving the material cost (because the price of a capacitor device, a switch device and a diode of the high-voltage wide-range large-current output circuit is very expensive). The invention replaces the design of the high-voltage wide-range large-current output circuit by the design method combining the DC/DC high-voltage small-current output circuit and the DC/DC low-voltage large-current output circuit, thereby achieving the technical effects of reducing the volume of the power supply and providing the power density.
Example 3:
the invention is based on a low-voltage large-current output system and method of a parallel direct-current power supply, and designs a parallel direct-current power supply, the structure schematic diagram of which is shown in figure 4, comprising:
the system comprises an alternating current input EMC module 1, an alternating current/DC power factor correction module 2, an alternating current working mode DC/DC high-voltage output circuit 3, an alternating current working mode DC/DC low-voltage output circuit 4, an intelligent charging module 5, a direct current output EMC module 11 and a high-low voltage output switching system;
the high-low voltage output switching system comprises: the device comprises a storage battery pack 6, a battery working mode DC/DC high-voltage output circuit 7, a battery working mode DC/DC low-voltage output circuit 8, a high-low voltage output switching controller 9 and a signal sampling processing control module 10.
The alternating current input EMC module 1 is used for realizing functions such as alternating current input filtering, lightning protection and interference resistance.
The AC/DC power factor correction module 2 is controlled by the signal sampling processing control module 10, and is used for realizing a power factor correction function, outputting 370V direct current bus voltage and providing electric energy for the alternating current high-voltage output circuit 3, the alternating current low-voltage output circuit 4 and the intelligent charging module 5.
The AC operation mode DC/DC high voltage output circuit 3 is controlled by the signal sampling processing control module 10, and is used for converting the 370V DC bus voltage output by the AC/DC power factor correction module 2 into the high voltage required by the DC output EMC module 11, in this embodiment, the voltage above 50V.
The AC operation mode DC/DC low voltage output circuit 4 is controlled by the signal sampling processing control module 10, and is configured to convert the 370V DC bus voltage output by the AC/DC power factor correction module 2 into a low voltage required for the output of the DC output EMC module 11, which is a voltage of 50V or less in this embodiment.
The intelligent charging module 5 is controlled by the signal sampling processing control module 10, and is used for changing the 370V direct current bus voltage output by the AC/DC power factor correction module 2 into the voltage required by charging the storage battery 6 and charging the storage battery 6.
And a battery 6 for storing energy.
The battery operation mode DC/DC high voltage output circuit 7 is controlled by the signal sampling processing control module 10 to convert the voltage from the battery pack 6 into a high voltage required for output, in this embodiment, a voltage of 50V or more.
The battery operation mode DC/DC low voltage output circuit 8 is controlled by the signal sampling processing control module 10 to convert the voltage from the battery pack 6 into a low voltage required for output, in this embodiment a voltage of 50V or less.
The high-low voltage output switching controller 9 is controlled by the signal sampling processing control module 10, and is used for selectively outputting the voltages of the alternating current working mode DC/DC high voltage output circuit 3, the alternating current working mode DC/DC low voltage output circuit 4, the battery working mode DC/DC high voltage output circuit 7 and the battery working mode DC/DC low voltage output circuit 8.
The signal sampling processing control module 10 is configured to sample, process and control relevant information of the AC/DC power factor correction module 2, the AC operation mode DC/DC high voltage output circuit 3, the AC operation mode DC/DC low voltage output circuit 4, the battery operation mode DC/DC high voltage output circuit 7, the battery operation mode DC/DC low voltage output circuit 8, the intelligent charging module 5 and the storage battery pack 10.
The direct current output EMC module 11 is used for realizing direct current output filtering, lightning protection and other functions.
When the parallel direct current power supply detects external alternating current, the external alternating current is used, an AC/DC power factor correction module 2 (also called as an AC/DC module 2) is connected with an AC input EMC module 1, the AC input EMC module 1 is connected with the alternating current, the signal sampling processing control module 10 controls the AC/DC module 2 to convert the alternating current and correct the power factor, and the AC input EMC module 1 realizes the filtering, lightning protection and interference resistance of the input alternating current;
the AC/DC module 2 is further connected to an AC operation mode DC/DC high voltage output circuit 3 (also referred to as an AC high voltage output circuit 3) and an AC operation mode DC/DC low voltage output circuit 4 (also referred to as an AC low voltage output circuit 4), and converts AC power and supplies power to the AC high voltage output circuit 3 and the AC low voltage output circuit 4;
the alternating-current high-voltage output circuit 3 and the alternating-current low-voltage output circuit 4 are both connected with the high-voltage output switching controller 9, the high-voltage output switching controller 9 is connected with the direct-current output EMC module 11, the direct-current output EMC module 11 is connected with a load, the purpose that the direct-current output of the low-voltage output or the direct-current output can be switched to the load is achieved, and the direct-current output EMC module 11 achieves the filtering, lightning protection and interference resistance of direct current output to the load;
the AC/DC module 2 is connected with the intelligent charging module 5, the intelligent charging module 5 is connected with the storage battery 6, and the intelligent charging module 5 is controlled by the signal sampling processing control module 10 to charge the storage battery 6 with the electric energy converted from alternating current. The function of supplying current to the load and charging the storage battery 6 under the condition of external alternating current is realized, and the storage battery 6 serving as a backup power supply is ensured to have sufficient electric energy.
The following is an operation process of the parallel direct current power supply provided in this embodiment under the working condition of DC/DC high voltage output in the ac working mode:
the alternating current enters an alternating current input EMC module 1, then enters an AC/DC power factor correction module 2, after power factor correction, part of the alternating current is output, enters an alternating current working mode DC/DC high-voltage output circuit 3, enters a direct current output EMC module 11 after passing through a high-low voltage output switching controller 9, and is finally output to a load for use;
the other part enters the intelligent charging module 5, and the storage battery 6 is charged through the intelligent charging module 5.
When no alternating current is input, the storage battery 6 is boosted by the battery working mode DC/DC low-voltage output circuit 8 and the battery working mode DC/DC high-voltage output circuit 7 and then enters the high-low voltage output switching controller 9, then enters the direct current output EMC module 11 and finally is output to a load for use. All parts of the whole parallel direct current power supply are collected, calculated, processed and controlled by the signal sampling processing control module 10 so as to realize corresponding functions.
In the embodiment, the high-voltage output circuit and the low-voltage output circuit are integrated on the parallel direct-current power supply, so that the switching is automatic when the power supply is used for a load, the high-voltage output function is kept, meanwhile, the low-voltage output current is realized, and the power supply reliability of the parallel power supply is improved; the design of the high-voltage wide-range large-current output circuit is replaced by a method of combining the high-voltage small-current output circuit and the low-voltage large-current output circuit, so that the design difficulty is greatly reduced, the material cost is saved, the power supply volume is reduced, and the power density is provided.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of protection thereof, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: various changes, modifications, or equivalents may be made to the particular embodiments of the invention by those skilled in the art after reading the present disclosure, but such changes, modifications, or equivalents are within the scope of the invention as defined in the appended claims.
Claims (13)
1. A parallel dc power low voltage high current output system, comprising: the system comprises a storage battery pack, a DC/DC low-voltage high-current output circuit, a DC/DC high-voltage low-current output circuit, a high-low-voltage output switching controller and a signal sampling processing control module;
the DC/DC low-voltage high-current output circuit is connected with the storage battery pack and is used for outputting low-voltage high current;
the DC/DC high-voltage small-current output circuit is connected with the storage battery pack and is used for outputting high-voltage small current;
the signal sampling processing control module is connected with the storage battery pack and the high-low voltage output switching controller and is used for collecting output voltage and output current of the storage battery pack and sending a switching instruction to the high-low voltage output switching controller based on the collected output voltage and output current; and the output voltage of the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit is regulated;
the high-low voltage output switching controller is connected with the DC/DC low-voltage high-current output circuit and the DC/DC high-voltage low-current output circuit and is used for switching the low-voltage high-current output circuit or the high-voltage low-current output circuit to work according to a switching instruction sent by the signal sampling processing control module;
the output voltage of the low-voltage high current is lower than a set switching voltage value, and the output current is higher than a high-current set limit value;
the output voltage of the high-voltage small current is higher than a set switching voltage value and the output current is lower than a small current set limit value.
2. The system of claim 1, wherein the high-low voltage output switching controller is further coupled to the load for providing DC current output from the DC/DC low voltage high current output circuit or the DC/DC high voltage low current output circuit to the load.
3. A method for outputting a high low voltage current of a parallel dc power supply, the method using the system of claim 1 for outputting a high low voltage current, comprising:
the method comprises the steps of collecting output voltage and output current of a storage battery pack through a signal sampling processing control module, adjusting output voltage of a DC/DC high-voltage small-current output circuit and a DC/DC low-voltage large-current output circuit according to set conditions based on the collected output voltage and output current, and sending a switching instruction to a high-voltage output switching controller and a low-voltage output switching controller;
the high-low voltage output switching controller is used for switching the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit to work according to the switching instruction sent by the signal sampling processing control module;
the output voltage is changed through the DC/DC low-voltage high-current output circuit or the DC/DC high-voltage low-current output circuit under the adjustment of the signal sampling processing control module, and the direct current is output.
4. The method of claim 3, wherein the step of collecting the output voltage and the output current of the battery pack by the signal sampling process control module and adjusting the DC/DC high voltage low current output circuit according to a set condition based on the collected output voltage and output current comprises:
s1, collecting output voltage and output current of a storage battery pack through a signal sampling processing control module, and judging whether the output current is higher than a small current set limit value or not;
s2, if yes, executing a high-voltage step-down step; otherwise, the output voltage is maintained.
5. The method of claim 4, wherein the high pressure drop step comprises:
s3, controlling a DC/DC high-voltage small-current output circuit to reduce output voltage through a signal sampling processing control module, and judging whether the output voltage is lower than a set switching voltage value or not;
s4, if yes, executing a circuit switching step; otherwise, the output voltage is maintained.
6. The method of claim 4, wherein the low current setting limit of the DC/DC high voltage low current output circuit is 6A when using a parallel DC power supply having a rated output voltage of 220V and a rated output current of 4A.
7. The method of claim 5, wherein the circuit switching step comprises:
s5, sending a command for switching to the DC/DC low-voltage high-current output circuit to the high-low-voltage output switching controller through the signal sampling processing control module, and judging whether the output current is higher than a high-current set limit value;
s6, if yes, the DC/DC low-voltage high-current output circuit is controlled to reduce the output voltage and maintain the output voltage through the signal sampling processing control module; otherwise, the output voltage is maintained.
8. The method of claim 7, wherein the high current setting limit of the DC/DC low voltage high current output circuit is 24A when using a parallel DC power supply having a rated output voltage of 220V and a rated output current of 4A.
9. The method of claim 7, wherein the minimum step of the DC/DC low voltage high current output circuit output voltage drop is 2mV when using a parallel DC power supply with an output voltage of 220V.
10. The method of claim 5, wherein the minimum step of the DC/DC high voltage low current output circuit output voltage drop is 10mV when using a parallel DC power supply with an output voltage of 220V.
11. The method of claim 5, wherein the set switching voltage values of the DC/DC low voltage high current output circuit and the DC/DC high voltage low current output circuit are 50V when a parallel direct current power supply having a rated output voltage of 220V and a rated output current of 4A is used.
12. The method of claim 3, wherein after the output voltage and the output current of the battery pack are collected by the signal sampling process control module, before the output voltages of the DC/DC high-voltage low-current output circuit and the DC/DC low-voltage high-current output circuit are adjusted in the set order based on the collected output voltages and the collected output currents, further comprising:
and carrying out A/D conversion on the acquired output voltage and output current to obtain digital signals of the output voltage and the output current.
13. The method of claim 3, wherein before the step of collecting the output voltage and the output current of the battery pack by the signal sampling process control module, further comprises: system initialization and system self-checking.
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