CN107370387B - Power conversion module and power supply system formed by serial-parallel connection of power conversion modules - Google Patents
Power conversion module and power supply system formed by serial-parallel connection of power conversion modules Download PDFInfo
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- CN107370387B CN107370387B CN201710677927.2A CN201710677927A CN107370387B CN 107370387 B CN107370387 B CN 107370387B CN 201710677927 A CN201710677927 A CN 201710677927A CN 107370387 B CN107370387 B CN 107370387B
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- H02M1/0083—Converters characterised by their input or output configuration
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/01—Resonant DC/DC converters
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33571—Half-bridge at primary side of an isolation transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a power conversion module, wherein two loops exist in the power conversion, one is an output voltage stabilizing ring for controlling the output voltage to be stable; the input equalizing ring is used for controlling the input voltage of the modules, and for N modules to be input into the power system with serial connection and output in parallel connection, the input voltage equalizing of each module can be realized through the loop, so that the input equalizing requirement and the output equalizing requirement in the power system with serial connection and output in parallel connection are realized, the high output voltage precision can be ensured, the direct serial-parallel connection of a plurality of modules is realized, the power system is more flexible, the efficiency is higher than that of a two-stage scheme, the output is more stable, and the power system is not affected by topology.
Description
Technical Field
The present utility model relates to a power conversion module and a power supply system, and more particularly to a power conversion module and a power supply system for high voltage input and modular applications.
Background
In the application system of the switching power supply, the input range of the high-voltage input occasion, such as a photovoltaic power supply, is wide, the input voltage is high, and the high voltage can reach 1500V or higher, so that the rated voltage of the switching tube of the converter of the subsequent stage needs to be improved. The on-state resistance of the high-voltage MOSFET is large, so that the on-state loss is large, and the cost is extremely high; the IGBT can be used as a switching tube, but the IGBT saturation voltage drop is small, but current tailing phenomenon exists, which limits the improvement of switching frequency, and is unfavorable for reducing the volumes of a transformer and a filter device (inductance and capacitance), and obviously not good choice due to the cost factor.
In order to solve the problem of high input voltage of the photovoltaic switch power supply, some switch power supply manufacturers want to perform series-parallel connection of power devices inside the switch power supply, and replace a required high-voltage application occasion with a plurality of low-voltage power devices, but such standard switch power supply modules limit the selection of users, and general manufacturers can perform ultra-wide range input in order to reduce the number of product models, so that the cost of the products is increased, but the design is redundant for customers. The design concept of a combined converter is also thought of, but is generally implemented by using a complex external control circuit, and the system is complex and not flexible enough to be applied. Therefore, it is a considerable problem for the power module manufacturer to directly compose the power system needed by the client with the standard power module. If the power supply type can be used, the power supply variety produced by a power supply production company can be greatly reduced, and a user can design a required power supply system by himself.
The standard power module is used for building a power supply system, and the most basic method is to adopt serial-parallel combination of input/output. Taking two identical power supply modules as an example, by adopting an input/output serial-parallel connection method, four power supply systems can be combined to obtain:
system 1: a system with parallel inputs and parallel outputs;
system 2: a system with inputs connected in series and outputs connected in parallel;
system 3: a system with parallel inputs and serial outputs;
system 4: and the input is connected in series, and the output is connected in series.
Of these four systems, the first system has been widely used. Typical products include high-power communication power supply systems, high-power UPS systems and the like, and the other three systems are not applied much.
Each module in the system 2 is preferably independent of the other, i.e. has its own control and power supply, from the redundancy requirement point of view. However, each module cannot be made into precise voltage stabilization of output voltage as a single standard power supply, because then, the current of each module after being connected in parallel at the output end can cause great unevenness due to factory setting value errors of module voltage, which also causes great unevenness of each module on the input voltage thereof, thereby affecting the reliability of the module and even damaging the module. Therefore, it is generally impossible to directly input and output power modules with precise voltage regulation in series.
In the existing common topology, forward and flyback all overrule the feasibility of an input-series-output-parallel system in principle. In a common topology, the input impedance in a small signal model of the Royer circuit is positive, so that the Royer circuit is suitable for a series-parallel system, but the Royer circuit is difficult to select a switching tube when being used in a high-voltage system, and is not suitable for the series-parallel system under high voltage.
The volume and flexibility of the switching power supply as an energy conversion supply unit of other electronic devices are also of great concern, such as high-power ultrathin products, and the volume of high-voltage devices and the volume of transformers seriously affect the height of the whole product. There are two solutions, one is to use the series-parallel connection form of transformers to disperse power in several transformers, so as to reduce the volume of the transformers, thereby achieving the purpose of reducing the volume of the whole switching power supply; another idea is to perform power expansion by connecting several small power modules in series and parallel. However, in the current structure of performing input-series output-parallel connection of two modules in the market, an additional current sharing circuit is required to be added outside the modules, so that the applied external control is complex, and certain professional restrictions are provided for clients, and some common clients which are not electronic professions cannot realize the current structure simply. Or the primary side is connected in series and the secondary side is connected in parallel by using the characteristic natural voltage equalizing of the topology with positive impedance characteristics.
In the serial-parallel connection structure mentioned in the patent application number 201621402396.3, an open-loop controlled asymmetric half-bridge flyback converter switching power supply module is adopted for serial-parallel connection.
Although the above patent can realize simple parallel connection of two switching power supply modules, the output voltage range of the whole system is larger than the input voltage range due to the reasons of load adjustment rate and the like, so that a second-stage voltage stabilizing system needs to be added, which has a great influence on the overall efficiency of the system. The circuit structure of the utility model is shown in fig. 1, fig. 2, fig. 3 and fig. 4, wherein fig. 1 is a schematic structure diagram of two modules directly input in series, output in parallel, fig. 2 is a schematic structure diagram of two modules directly input in series, output in parallel and added with a voltage stabilizing module, fig. 3 is a schematic structure diagram of a plurality of modules directly input in series, output in parallel, and fig. 4 is a schematic structure diagram of a plurality of modules directly input in series, output in parallel and added with a voltage stabilizing module.
In the first embodiment of the utility model patent with application number 201621402396.3, two standard power conversion modules with input voltage ranging from 120VDC to 240VDC are adopted as a series-parallel connection to form a 120W power supply system, and experimental verification is carried out on the effect of series-output and parallel connection of the input and the output under open loop control. After the deviation of the open loop control parameter is considered, the input voltage precision estimation of the module is reduced, and at the moment, the two extreme deviations of the control parameter and the two extreme deviations of the power level parameter can be combined into a new two extreme module according to the magnitude of the module gain. Theoretically, these two modules a and B with the maximum gain and the minimum gain correspond to the following parameters, respectively:
the module with the maximum gain: l (L) m(min) ，L r(min) ，C r(min) ，D mac ，f s(min) ；
The module with the smallest gain: l (L) m(max) ，L r(max) ，C r(max) ，D min ，f s(max) 。
The five parameters described above were combined into the following five sets of experimental parameters:
combination 1: input series/output parallel experiments with nominal parameters for both power level and control
A module parameter: l (L) m ＝145uH，L r ＝7uH，C r ＝0.27uF，D＝0.5，f s ＝100KHz
B module parameters: l (L) m ＝145uH，L r ＝7uH，C r ＝0.27uF，D＝0.5，f s ＝100KHz
Combination 2: input series/output parallel experiment with power stage and duty cycle as nominal parameters, but switching frequency as upper and lower deviation respectively
A module parameter: l (L) m ＝145uH，L r ＝7uH，C r ＝0.27uF，D＝0.5，f s ＝90KHz
B module parameters: l (L) m ＝145uH，L r ＝7uH，C r ＝0.27uF，D＝0.5，f s ＝110KHz
Combination 3: input series/output parallel experiments with nominal parameters of power stage and switching frequency, but upper and lower deviations of duty cycle
A module parameter: l (L) m ＝145uH，L r ＝7uH，C r ＝0.27uF，D＝0.55，f s ＝100KHz
B module parameters: l (L) m ＝145uH，L r ＝7uH，C r ＝0.27uF，D＝0.45，f s ＝100KHz
Combination 4: input series/output parallel experiment with switching frequency and duty cycle as nominal parameters, but power stage parameters as upper and lower deviations respectively
A module parameter: l (L) m ＝130.5uH，L r ＝6.3uH，C r ＝0.22uF，D＝0.5，f s ＝100KHz
B module parameters: l (L) m ＝159.5uH，L r ＝7.7uH，C r ＝0.22uF，D＝0.5，f s ＝100KHz
Combination 5: input series/output parallel experiment with nominal duty cycle, but power stage parameter and switching frequency being up-down deviations respectively
A module parameter: l (L) m ＝130.5uH，L r ＝6.3uH，C r ＝0.22uF，D＝0.55，f s ＝90KHz
B module parameters: l (L) m ＝159.5uH，L r ＝7.7uH，C r ＝0.22uF，D＝0.45，f s ＝110KHz
The experimental data of the input equalizing effect and the output equalizing effect of the system are shown in table 1 and table 2, the combination 1 is the data with good consistency of the two modules, and from the data, it can be seen that the input equalizing precision is within 1% on the basis of ensuring consistency, the equalizing precision is within +/-1%, and even if the inconsistency of the two modules is considered, the equalizing precision and the equalizing precision are within +/-10%. Table 3 shows the output voltage values for various parameter combinations for various input voltages and full load output conditions.
TABLE 1 maximum input Voltage equalizing precision of various parameter combinations at different input voltages
| Pressure equalizing precision | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 |
| Vg＝300V | ±0.67％ | ±1.23％ | ±8.7％ | ±6.8％ | ±5.6％ |
| Vg＝400V | ±0.38％ | ±1.20％ | ±8.2％ | ±6.8％ | ±5.5％ |
| Vg＝530V | ±0.15％ | ±1.21％ | ±8.0％ | ±6.9％ | ±5.6％ |
TABLE 2 full load output current sharing accuracy for various parameter combinations at different input voltages
| Flow equalization accuracy | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 |
| Vg＝300V | ±0.10％ | ±0.92％ | ±8.5％ | ±6.6％ | ±6.1％ |
| Vg＝400V | ±0.12％ | ±1.30％ | ±7.9％ | ±7.0％ | ±7.4％ |
| Vg＝530V | ±0.25％ | ±1.63％ | ±7.6％ | ±7.3％ | ±6.9％ |
TABLE 3 output voltages (V) for various parameter combinations under different input voltages and full load output conditions
| Output voltage | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 |
| Vg＝300V | 13.99 | 13.97 | 13.95 | 13.63 | 14.52 |
| Vg＝400V | 19.28 | 19.25 | 19.24 | 18.81 | 19.99 |
| Vg＝530V | 25.93 | 25.91 | 25.89 | 25.26 | 26.81 |
From the three tables, the input voltage equalizing precision and the output voltage equalizing precision of the two modules can be met after the input of the two modules are connected in series and the output of the two modules are connected in parallel, but the output voltage range is larger than the input voltage range, and the bus voltage range of the current ACDC is about 5:1, so that the design difficulty of the voltage stabilizing module of the later stage is extremely high.
Disclosure of Invention
Therefore, the technical problems to be solved by the utility model are as follows: the power conversion module is provided, input voltage equalizing and output current equalizing requirements in the power supply system with input connected in series and output connected in parallel are achieved, high output voltage precision can be guaranteed, direct series-parallel connection of a plurality of modules is achieved, the power supply system is more flexible, compared with a two-stage scheme, efficiency is higher, output is more stable, and the power supply system is not affected by topology. The modular concept is introduced, and the input stage adopts a mode of connecting a plurality of modules in series, so that the voltage stress of each module is greatly reduced.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
a power conversion module, characterized by:
comprises 7 unit circuits: the device comprises a main power circuit, a control driving circuit, a primary side and secondary side isolation circuit, a loop isolation circuit, an input isolation sampling circuit, an input equalizing ring and an output stabilizing ring; comprising 9 external terminals: a positive input voltage terminal, a negative input voltage terminal, a positive output voltage terminal, a negative output voltage terminal, a positive signal input terminal, a negative signal input terminal, a positive signal output terminal, a negative signal output terminal, and an output voltage sampling terminal;
the connection relation is as follows: the input end of the main power circuit is connected with a positive input voltage terminal and a negative input voltage terminal, and the output end of the main power circuit is connected with a positive output voltage terminal and a negative output voltage terminal; the input end of the input isolation sampling circuit is connected with a positive input voltage terminal and a negative input voltage terminal, the negative output end of the input isolation sampling circuit is simultaneously connected with a negative output voltage terminal and a negative signal output terminal, the positive output end of the input isolation sampling circuit is simultaneously connected with one input end of the positive signal output terminal and one input end of the input equalizing ring, the other input end of the input equalizing ring is connected with the positive signal input terminal, the third input end of the output equalizing ring is connected with the negative signal input terminal, and the output end of the input equalizing ring is connected with one input end of the loop isolation circuit; the output voltage sampling terminal is connected to an output voltage stabilizing ring, and the output end of the output voltage stabilizing ring is connected to the other input end of the loop isolation circuit; the output end of the loop isolation circuit is connected to the main power circuit after sequentially passing through the primary side isolation circuit, the secondary side isolation circuit and the control driving circuit;
the functions of each terminal are as follows: a positive input voltage terminal and a negative input voltage terminal for inputting a voltage; a positive output voltage terminal and a negative output voltage terminal for outputting a voltage; the signal input terminal is positive and the signal input terminal is negative, and is used for inputting the equalizing ring to receive external signals; the signal output terminal is positive and the signal output terminal is negative and is used for isolating the sampling circuit to output a sampling signal; an output voltage sampling terminal for inputting a voltage to be sampled;
the functions of each unit circuit are as follows:
the main power circuit performs isolation transformation on the input voltage to obtain output voltage;
a control driving circuit for providing a switch control signal for a power switch of the main power circuit;
the primary side and secondary side isolation circuit is used for carrying out isolation transmission on the switch control signals;
an output voltage stabilizing ring for controlling the output voltage to be stable;
the input isolation sampling circuit is used for collecting input voltage and outputting a sampling signal to the positive of the signal output terminal;
inputting a grading ring, comparing the magnitude of the sampling signal with the magnitude of an external signal, and controlling the magnitude of input voltage;
and the loop isolation circuit isolates the output voltage-stabilizing ring from the input voltage-stabilizing ring.
Preferably, the negative output voltage terminal, the signal input terminal and the signal output terminal are multiplexed by negative 3 external terminals, i.e. the three terminals are the same terminal.
Preferably, the main power circuit employs an asymmetric half-bridge flyback topology.
Preferably, the driving pulse signals of the two switching tubes in the asymmetric half-bridge flyback topology are staggered by a dead time for preventing common short circuit.
Preferably, the dead time is 300nS.
The application of the technical scheme is as follows: the output voltage sampling terminal can be connected with the negative output voltage terminal to shield the function of the output voltage stabilizing ring.
The application of the technical scheme is as follows: the signal input terminal can be connected with the positive output voltage terminal and the negative output voltage terminal, and the function of the input equalizing ring is shielded.
The utility model also provides a power supply system, which comprises N power conversion modules adopting the technical scheme, wherein N is a natural number larger than 1, and the connection relation is as follows: the positive input voltage terminal of the first power conversion module is the positive input end of the power supply system, the negative input voltage terminal of the first power conversion module is connected with the positive input voltage terminal of the second power conversion module, the negative input voltage terminal of the second power conversion module is connected with the positive input voltage terminal of the third power conversion module, and so on, the negative input voltage terminal of the N-1 th power conversion module is connected with the positive input voltage terminal of the N-th power conversion module, and the negative input voltage terminal of the N-th power conversion module is used as the negative input end of the power supply system; the positive output voltage terminals of the N power conversion modules are connected and then used as the positive output end of the power supply system, and the negative output voltage terminals of the N power conversion modules are connected and then used as the negative output end of the power supply system; the signal output terminal of the first power conversion module is suspended, the signal input terminal of the first power conversion module is connected with the signal output terminal of the second power conversion module, the signal input terminal of the second power conversion module is connected with the signal output terminal of the third power conversion module, and so on, the signal input terminal of the N-1 th power conversion module is connected with the signal output terminal of the N-th power conversion module, and the signal input terminal of the N-th power conversion module is connected with the negative output end of the power supply system; the output voltage sampling terminals of the N-th power conversion module are connected with the positive output end of the power supply system, and the output voltage sampling terminals of the other N-1 power conversion modules are connected with the negative output end of the power supply system.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The output voltage of the input series output parallel system is constant and has stable voltage output;
(2) The input series output parallel system is simple in implementation mode, and the series and parallel connection of the modules can be realized only by a plurality of connecting lines;
(3) The utility model adopts modularized thinking to split the system into N identical standard modules;
(4) The voltage stress and the current stress of a single standardized module are low, so that the cost of the device can be reduced;
(5) The system can be freely built by directly using the standard modules according to the requirements, is flexible to use and high in portability, has low requirements on clients, and can be directly connected with the input of the modules in series and the output of the modules in parallel without the need of professional knowledge in the field;
(6) The standard power supply modules are used for forming a required power supply system, so that the product types are reduced, and the product management cost is lowered;
(7) The direct-current voltage signals are adopted among the standard modules, and the multi-module input serial and output parallel system is easy to distribute boards and cannot generate mutual interference.
Drawings
FIG. 1 is a block diagram of a dual-module input-series-output-parallel system of the utility model with application number 201621402396.3;
FIG. 2 is a block diagram of a dual-module input-series-output-parallel system with a voltage stabilizing module according to the utility model of application number 201621402396.3;
FIG. 3 is a block diagram of an input-series-output-parallel system of N standard modules of the utility model with application number 201621402396.3;
FIG. 4 is a block diagram of an input-series-output-parallel system of N standard modules with voltage stabilizing modules of the utility model with application number 201621402396.3;
FIG. 5 is a functional block diagram of a power conversion module of the present utility model;
FIG. 6 is a pin diagram of a power conversion module of the present utility model;
FIG. 7 is a diagram of the connection of a two-module input series and output parallel system of the present utility model;
FIG. 8 is a connection of N modules in the input series and output parallel system of the present utility model;
FIG. 9 is a schematic diagram of a single power conversion module of the present utility model connected to output voltage regulation modes of operation;
FIG. 10 is a schematic diagram of a single power conversion module of the present utility model connected in an input voltage equalizing mode of operation;
figure 11 is a schematic diagram of a single module in a primary-side series-secondary-side parallel system of a first embodiment.
Detailed Description
The technical conception of the utility model is to provide a novel double-loop control technical scheme, namely, two loops exist in one power converter, one loop is used for controlling output voltage to be stable, and the loop is defined as an output voltage stabilizing loop; the input voltage of each module can be equalized through the loop, and the input voltage equalizing circuit is defined as an input equalizing ring.
Fig. 5 is a schematic block diagram of a power conversion module of the present utility model, the power conversion module comprising:
7 unit circuits: the device comprises a main power circuit, a control driving circuit, a primary side and secondary side isolation circuit, a loop isolation circuit, an input isolation sampling circuit, an input equalizing ring and an output stabilizing ring;
7 outer terminals: a positive input voltage terminal, a negative input voltage terminal, a positive output voltage terminal, a negative output voltage terminal, a signal input terminal positive, a signal output terminal positive, an output voltage sampling terminal;
in the block diagram, the signal input terminal is negative, and the signal output terminal is negative and multiplexed with the negative input voltage terminal, so that the signal input terminal negative and the signal output terminal negative are not shown in fig. 5;
the connection relation is as follows: the input end of the main power circuit is connected with a positive input voltage terminal and a negative input voltage terminal, and the output end of the main power circuit is connected with a positive output voltage terminal and a negative output voltage terminal; the input end of the input isolation sampling circuit is connected with a positive input voltage terminal and a negative input voltage terminal, the negative output end of the input isolation sampling circuit is connected with a negative output voltage terminal, the positive output end of the input isolation sampling circuit is simultaneously connected to the signal output terminal and one input end of the input equalizing ring, the other input end of the input equalizing ring is connected to the signal input terminal, and the output end of the input equalizing ring is connected to one input end of the loop isolation circuit; the output voltage sampling terminal is connected to an output voltage stabilizing ring, and the output end of the output voltage stabilizing ring is connected to the other input end of the loop isolation circuit; the output end of the loop isolation circuit is connected to the main power circuit after sequentially passing through the primary and secondary side isolation circuits and the control driving circuit.
The main power circuit is used for carrying out input-output voltage isolation conversion; the control driving circuit provides a control signal for the main power circuit; the primary and secondary side isolation circuit performs isolation transmission on signals; the loop isolation circuit is used for isolating two loops; the input equalizing ring is used for controlling the input voltage; the output voltage stabilizing ring is used for stabilizing the output voltage; the input isolation sampling circuit is used for collecting input voltage of the power conversion module, and input and output signals of the input isolation sampling circuit are in linear relation.
Fig. 6 is a pin diagram of a power conversion module of the present utility model, including 7 terminals: positive input voltage terminal vg+, negative input voltage terminal Vg-, positive output voltage terminal vo+, negative output voltage terminal Vo-, signal input terminal positive vg_s_in+, signal output terminal positive vg_s_out+, output voltage sampling terminal vo_s.
In fig. 6, the signal input terminal negative and the signal output terminal negative and negative output voltage terminals Vo-are multiplexed, and one terminal is shared.
FIG. 7 is a schematic diagram of a connection of a two-module input-series and output-parallel system according to the present utility model; FIG. 8 is a connection of N modules in the input series and output parallel system of the present utility model. It should be noted that, in the same module, the two loops do not work simultaneously, and the output voltage stabilizing operation mode shown in fig. 9 and the input voltage equalizing operation mode shown in fig. 10 are respectively formed by external connection, and the main operation principle is described as follows:
when the modules are connected into an output voltage stabilizing operation mode, as shown in fig. 9, the input equalizing ring is not active, and the signal input terminal of the power conversion module is positively connected to the negative output voltage terminal, and the output voltage sampling terminal of the power conversion module is connected with the positive output voltage terminal, so that the effect of sampling the output voltage is realized. Therefore, the power conversion module has only one output voltage stabilizing ring, and the working process of the power conversion module is the same as that of a common switching power supply, and is not repeated here.
When the modules are connected into an input voltage equalizing mode, as shown in fig. 10, the output voltage equalizing ring is not active, and is realized by connecting the output voltage sampling terminal of the power conversion module with the negative output voltage terminal, the signal input terminal of the power conversion module is connected with the signal output terminal of the other power conversion module (as a loop sampling signal), in the input voltage equalizing ring module in the power conversion module, the signal output terminal of the power conversion module is compared with the signal output terminal of the other power conversion module (as a loop reference signal), so as to generate a voltage equalizing control signal for controlling the duty ratio, and the magnitude of the input voltage is controlled, for example, the input voltages of the two modules are equal, namely, the input voltage equalizing of the two modules is realized. Therefore, the power conversion module has only one input equalizing ring, and other working processes except for the loop sampling signal and the loop reference signal are the same as those of the common switching power supply, and are not repeated here.
The use of text description alone will make it difficult for those skilled in the art to understand, so that it is permissible to use a schematic diagram in combination with signal flow directions commonly used in electronic engineering to explain the working principle of the present utility model. Specific embodiments of the present utility model are described in detail below.
First embodiment
The working principle of the power supply system of the first embodiment of the utility model is as follows:
fig. 11 is a schematic diagram of a circuit implementation of each module in a dual-module input serial and output parallel power system.
The module contains 7 sub-modules: the device comprises a main power circuit 101, a control driving circuit 102, a primary side and secondary side isolation circuit 103, a loop isolation circuit 105, an input isolation sampling circuit 104, an input equalizing ring 107 and an output equalizing ring 106;
the module contains 7 terminals: positive input voltage terminal vg+, negative input voltage terminal Vg-, positive output voltage terminal vo+, negative output voltage terminal Vo-, signal input terminal positive vg_s_in+, signal output terminal positive vg_s_out+, output voltage sampling terminal vo_s.
The module has the advantages that the signal input terminal negative and the signal output terminal negative and negative output voltage terminals Vo-are multiplexed and are connected with the secondary side grounding terminal, and the internal components and connection relation of each submodule are as follows:
main power circuit 101: the asymmetric half-bridge flyback topology consists of a capacitor Cin, switches S1 and S2, an inductor Lr, a capacitor Cr, a transformer T, a transformer primary winding Np, a transformer secondary winding Ns, a diode D1, a capacitor C1, an inductor L1 and a capacitor C2; the capacitor Cin is connected with a positive input voltage terminal Vg+ and a negative input voltage terminal Vg-in parallel, and the negative input voltage terminal Vg-is connected with the original side grounding end; the drain electrode of the switch S1 is connected with a connection point of the capacitor Cin and the positive input voltage terminal Vg+, the source electrode of the switch S1 is connected with one end of the inductor Lr, the source electrode of the switch S1 is also connected with the drain electrode of the switch S2, the source electrode of the switch S2 is connected with the primary side grounding end, and the other end of the inductor Lr is connected with the same-name end of the primary side winding Np of the transformer; one end of a capacitor Cr is connected with the synonym end of a primary winding Np of the transformer, the other end of the capacitor Cr is connected with the primary grounding end, the synonym end of a secondary transformer winding Ns of the transformer is connected with the anode of a diode D1, the cathode of the diode D1 is connected with one end of a capacitor C1 and one end of an inductor L1, the other end of the inductor L1 is connected with one end of a capacitor C2 to form a positive output voltage terminal vo+, and the synonym end of the secondary transformer winding Ns of the transformer is connected with the other ends of the capacitor C1 and the capacitor C2 and is connected with the secondary grounding end.
Control driving circuit 102: the circuit comprises a control chip UC3843, a driving circuit, a circuit sampling circuit, a capacitor Cq1, a capacitor Cq2, a capacitor Ct, a capacitor Cv2, a resistor Rt, a resistor Rv2, a resistor Rv3 and a resistor R3; one end of a capacitor Cq1 is connected with a Vcc pin and a voltage Vcc_p of a chip UC3843, the Vcc pin of the chip UC3843 is controlled to be powered from a power supply Vcc_p, and the other end of the capacitor Cq1 is simultaneously connected with a GND pin and a primary grounding end of the chip UC 3843; the driving circuit is connected with an output OUT pin of a chip UC3843, and outputs two paths of driving signals Vgs1 and Vgs2 to grid electrodes of a switch S1 and a switch S2 respectively, a switch control signal is provided for the switch S1 and the switch S2, and a certain dead time is needed to be staggered between the two paths of driving signals Vgs1 and Vgs2 in order to prevent the two switching tubes S1 and S2 in the asymmetric half-bridge flyback topology from sharing a short circuit, and the value of 300nS is obtained through a prototype test in the embodiment; the first input end and the second input end of the current sampling circuit are connected in parallel with a capacitor Cr of the main power circuit, and the output end of the current sampling circuit is connected with a CS pin of a control chip UC 3843; one end of a capacitor Cq2 is connected with the original grounding end, the other end of the capacitor Cq2 is simultaneously connected with a reference voltage Vref, one end of a resistor Rt and a Vref pin of a control chip UC3843, the other end of the resistor Rt is simultaneously connected with an RT/CT pin of the control chip UC3843 and one end of a capacitor CT, and the other end of the capacitor CT is connected with the original grounding end; the capacitor Cv2 is connected with the resistor Rv2 in parallel, one end of the resistor Rv2 is connected with the Comp pin of the control chip UC3843, the other end of the resistor Rv2 is simultaneously connected with one end of the resistor Rv3 and the Vfb pin of the control chip UC3843, the voltage Vc2 is formed at the position, the Vfb pin is a feedback pin of the chip UC3843, the other end of the resistor Rv3 is simultaneously connected with the resistor R3 and the triode emitter of the optocoupler in the primary and secondary side isolation circuit, and the other end of the resistor R3 is connected with the primary side grounding end.
Primary-secondary side isolation circuit 103: the optical coupler and the peripheral circuit are adopted to realize; the circuit consists of an optical coupler OC1, a resistor R1 and a resistor R2; the diode cathode of the optical coupler OC1 is simultaneously connected with one end of a resistor R2, the other end of the resistor R2 is simultaneously connected with the diode anode of the optical coupler OC1 and one end of the resistor R1, the other end of the resistor R1 is connected with a voltage end Vcc_s, the triode collector of the optical coupler OC1 is connected with a reference voltage end Vref, and the triode emitter of the optical coupler OC1 is connected with a connection point of Rv3 and R3 in a control driving circuit.
Output voltage stabilizing ring 106: the device consists of an LM358 operational amplifier A1, a capacitor Cv1, a resistor Rv1, a resistor Ra, a controllable precise voltage stabilizing source TL431, a resistor Rf1 and a resistor Rf 1; one end of a resistor Rf1 is connected with an output voltage sampling terminal vo_s, the other end of the resistor Rf1 is connected with one end of a resistor Rf2, the other end of the resistor Rf2 is simultaneously connected with a negative output voltage terminal Vo-and a secondary side grounding terminal, a negative input end of an operational amplifier is connected with a connection point of the Rf1 and the Rf2, one end of the Rv1 is connected with a capacitor Cv1, and the other end of the capacitor Cv1 is connected with an output end of the operational amplifier A1 and is connected with a cathode of a diode D2 in a loop isolation circuit; the anode of the controllable precise voltage stabilizing source TL431 is connected with the secondary side grounding end, the adjustable end of the controllable precise voltage stabilizing source TL431 is simultaneously connected with one end of a resistor Ra and the positive input end of an operational amplifier A1, the other end of the resistor Ra is connected with a voltage Vcc_s, and the cathode of the controllable precise voltage stabilizing source TL431 is connected with the positive input end of the operational amplifier A1.
Input isolation sampling circuit 104: the device consists of a linear sampling circuit and a signal isolation circuit; the first input end of the input isolation sampling circuit is connected with the positive input voltage terminal Vg+, the second input end of the input isolation sampling circuit is connected with the primary side grounding end, the first output end of the input isolation sampling circuit is connected with the signal output terminal positive Vg_s_out+, and the second output end of the input isolation sampling circuit is connected with the secondary side grounding end.
Input equalizing ring 107: the circuit comprises an LM358 operational amplifier A2, a capacitor Ci1, a resistor Ri1, a resistor R4, a resistor R5, a resistor R6 and a resistor R7; one end of a resistor R6 is connected with a signal output terminal positive Vg_s_out+, the other end of the resistor R6 is connected with one end of a resistor R5 and the positive input end of an operational amplifier A2, and the other end of the resistor R5 is connected with a secondary side grounding end; one end of the resistor R7 is connected with the signal output terminal positive Vg_s_in+, the other end of the resistor R7 is simultaneously connected with one end of the resistor R4, one end of the resistor Ril and the negative input end of the operational amplifier A2, the other end of the resistor R4 is connected with the secondary side grounding end, the other end of the resistor Ril is connected with one end of the capacitor Cil, and the other end of the capacitor Cil is simultaneously connected with the output end of the operational amplifier A2 and the cathode of the diode D3 in the loop isolation circuit.
Loop isolation circuit 105: the common anode connection is carried out by adopting two diodes D2 and D3 as shown in the figure, the common anode end is connected with the diode cathode of the optocoupler OC1, and the cathodes of the two diodes D2 and D3 are respectively connected with the output stabilizing ring and the output ends of the operational amplifiers A1 and A2 in the input stabilizing ring.
From the standardization point of view, two rings are designed in each module: one output voltage-stabilizing ring and one input voltage-stabilizing ring. The operation of the modules with different functions can be achieved by simple external wiring. When the voltage stabilizing module is needed to be changed, the module signal input terminal is just positive V g_s_in+ To the output ground, an output voltage sampling terminal v o_s The output voltage end is connected;when the voltage equalizing module is needed to be changed, only the output voltage sampling terminal v is needed o_s To the output ground, the module signal input terminal is positive V g_s_in+ Module signal output terminal positive V connected to next module g_s_out+ And (3) obtaining the product. In this embodiment, the connection between the input voltage equalizing module and the output voltage stabilizing module can be realized by adopting the pin wiring method shown in fig. 9 and 10, and the specific module schematic diagram shown in fig. 11 is not used for drawing and displaying.
The connection of the dual-module input serial output parallel power supply system can be realized by adopting the pin wiring mode of fig. 7, wherein the lower module is connected into an output voltage stabilizing closed-loop control, which is called a voltage stabilizing module; the upper module is connected into an input voltage-sharing closed-loop control, namely a voltage-sharing module; only one closed loop per module is in operation. The input series and output parallel structures generalized to N modules are shown in FIG. 8, wherein only one module is connected into one output voltage stabilizing closed loop control, and the other modules are connected into one input equalizing ring control.
Working principle:
in this embodiment, the whole system is composed of an upper power conversion module, a lower power conversion module, a serial input and a parallel output, and the main power stage of the single power conversion module works in the same principle as an asymmetric half-bridge flyback circuit, which is a well-known technology for those skilled in the art and is not developed here. The control process is as follows:
output voltage sampling terminal v of upper module o_s1 When the output voltage is grounded, the operational amplifier A1 in the output voltage stabilizing ring unit of the upper module is saturated, the output voltage of the operational amplifier is close to the power supply voltage of the operational amplifier, and therefore the diode D21 in the loop isolation circuit unit is cut off, and the output voltage stabilizing loop of the upper module is shielded. Positive V of upper module signal input terminal g_s_in1+ Module signal output terminal positive V connected to lower module g_s_out2+ The module signal output terminal of the upper module is positive V g_s_out1+ For reference, positive V is a module signal output terminal of the lower module g_s_out2+ When the input voltage Vg1 of the upper module is higher than the input voltage Vg2 of the lower module, the module signal of the upper module is obtained after the isolation sampling circuit is inputOutput terminal positive V g_s_out1+ Just be greater than module signal output terminal positive V of lower module g_s_out2+ And the output voltage of the input equalizing ring unit in the upper module is increased, the current flowing into the optical coupler OC11 luminous tube is reduced, the FB pin voltage in the control circuit of the upper module is reduced, the COMP pin voltage is increased, the output duty ratio of the control circuit is increased, the power transmitted by the upper module is increased, the voltage of the input capacitor Cin1 of the upper module is reduced, and the input voltages of the upper module and the lower module tend to be the same.
Module signal input terminal positive V of lower module g_s_in+ When the output voltage is grounded, the operational amplifier A2 in the input equalizing ring unit of the lower module is saturated, the output voltage of the operational amplifier is close to the power supply voltage of the operational amplifier, and therefore the diode D32 in the loop isolation circuit unit is cut off, and the input equalizing loop of the lower module is shielded. Output voltage sampling terminal v of lower module o_s The common output voltage stabilizing ring is realized after the output voltage end is connected, and the working process is the prior known technology and is not expanded.
In the embodiment, two standard power conversion modules with the input voltage range of 120 VDC-240 VDC are used as a series-parallel connection to form a 120W power supply system, and experimental verification is carried out on the effect of series connection, output and parallel connection of the input under the full closed loop operation. In order to fully verify the influence of the utility model on the input voltage equalizing precision, the output voltage equalizing precision and the output voltage precision under the tolerance, the utility model is subjected to tolerance experiment verification. The two extreme deviations of the control parameter and the two extreme deviations of the power level parameter are considered, and a new module with the two extreme deviations is combined according to the gain of the power conversion module. Theoretically, these two modules with the maximum gain and the minimum gain correspond to the following parameters, respectively:
the module with the maximum gain: minimum excitation inductance, minimum leakage inductance, minimum resonance capacitance and minimum frequency, namely: l (L) m(min) ,L r(min) ,C r(min) ,f s(min) ；
The module with the smallest gain: excitation inductance maximum, leakage inductance maximum, resonance capacitance maximum, frequency maximum, namely: l (L) m(max) ,L r(max) ,C r(max) ,f s(max) 。
The four parameters described above were combined into the following six sets of experimental parameters:
combination 1: input series/output parallel experiments with nominal parameters for both power level and control
A module parameter: l (L) m ＝145uH，L r ＝6.37uH，C r ＝0.27uF，f s ＝100KHz
B module parameters: l (L) m ＝145uH，L r ＝6.37uH，C r ＝0.27uF，f s ＝100KHz
Combination 2: input series/output parallel experiment with standard power level and switching frequency of up-down deviation
A module parameter: l (L) m ＝145uH，L r ＝6.37uH，C r ＝0.27uF，f s ＝90KHz
B module parameters: l (L) m ＝145uH，L r ＝6.37uH，C r ＝0.27uF，f s ＝110KHz
Combination 3: input series/output parallel experiment with switching frequency as nominal parameter, but power level as upper and lower deviation respectively
A module parameter: l (L) m ＝130.5uH，L r ＝5.733uH，C r ＝0.216uF，f s ＝100KHz
B module parameters: l (L) m ＝159.5uH，L r ＝7.007uH，C r ＝0.324uF，f s ＝100KHz
Combination 4: input series/output parallel experiment with switching frequency and power stage parameters of up-down deviation respectively
A module parameter: l (L) m ＝130.5uH，L r ＝5.733uH，C r ＝0.216uF，f s ＝90KHz
B module parameters: l (L) m ＝159.5uH，L r ＝7.007uH，C r ＝0.324uF，f s ＝110KHz
Combination 5: input series/output parallel experiment with switching frequency as nominal parameter, but power level as upper and lower deviation respectively
A module parameter: l (L) m ＝159.5uH，L r ＝7.007uH，C r ＝0.324uF，f s ＝100KHz
B module parameters: l (L) m ＝130.5uH，L r ＝5.733uH，C r ＝0.216uF，f s ＝100KHz
Combination 6: input series/output parallel experiment with switching frequency and power stage parameters of lower and upper deviation respectively
A module parameter: l (L) m ＝159.5uH，L r ＝7.007uH，C r ＝0.324uF，f s ＝110KHz
B module parameters: l (L) m ＝130.5uH，L r ＝5.733uH，C r ＝0.216uF，f s ＝90KHz
The experiment is carried out according to the six groups of combinations, the obtained experimental results are shown in tables 4 to 7, and table 4 shows the maximum input voltage equalizing precision of various parameter combinations under different input voltages; table 5 shows the full load output current equalizing precision of various parameter combinations under different input voltages; table 6 shows the output voltages of various parameter combinations under the condition of different input voltages and full load output; table 7 shows the test results of the grading ring and the stabilizing ring loop of the external power supply DC-DC part actual PCM control closed loop experiment.
TABLE 4 maximum input Voltage equalizing precision of various parameter combinations at different input voltages
| Pressure equalizing precision | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 | Combination 6 |
| V g ＝300V | ±0.87％ | ±0.2％ | ±0.2％ | ±0.67％ | ±0.6％ | ±0.47％ |
| V g ＝400V | ±0.8％ | ±0.25％ | ±0.3％ | ±0.5％ | ±0.55％ | ±0.6％ |
| V g ＝530V | ±0.42％ | ±0.23％ | ±0.15％ | ±0.42％ | ±0.38％ | ±0.45％ |
TABLE 5 full load output current sharing accuracy for various parameter combinations at different input voltages
| Flow equalization accuracy | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 | Combination 6 |
| V g ＝300V | ±0.46％ | ±0.09％ | ±0.09％ | ±0.37％ | ±0.09％ | ±0.18％ |
| V g ＝400V | ±0.37％ | ±0.37％ | ±0.09％ | ±0.65％ | ±0.18％ | ±0.46％ |
| V g ＝530V | ±0.37％ | ±0.46％ | ±0.09％ | ±0.74％ | ±0.37％ | ±0.65％ |
TABLE 6 output voltages (V) for various parameter combinations under different input voltages and full load output conditions
| Output voltage | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 | Combination 6 |
| V g ＝300V | 12.01 | 12.01 | 12.01 | 12.01 | 12.01 | 12.01 |
| V g ＝400V | 12.01 | 12.01 | 12.01 | 12.00 | 12.00 | 12.00 |
| V g ＝530V | 11.98 | 11.98 | 11.99 | 11.98 | 11.98 | 11.98 |
TABLE 7 grading and stabilizing ring loop test results of actual PCM control closed-loop experiment of DC-DC part of external power supply
From the experimental results, the input voltage equalizing precision and the output voltage equalizing precision of the combination 1 to the combination 6 are within 1%, the output voltage precision is within 1%, the bandwidth of the input equalizing ring is more than 1KHz, the phase margin and the gain margin are very large, the loop stability is very good, and the requirement of the input voltage equalizing system is met.
The experiment can fully prove that the scheme of the utility model not only can meet the input voltage equalizing precision and the output voltage equalizing precision, but also can control the output voltage precision to be about 1%, thereby realizing the purposes of equalizing voltage and equalizing current, and stabilizing the output voltage, and being higher than the prior art.
The above is only a preferred embodiment of the present utility model, and it should be noted that the above-described preferred embodiment should not be construed as limiting the present utility model. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the utility model, and these modifications and adaptations should and are intended to be comprehended by the following claims.
Claims (8)
1. A power conversion module, characterized by:
comprises 7 unit circuits: the device comprises a main power circuit, a control driving circuit, a primary side and secondary side isolation circuit, a loop isolation circuit, an input isolation sampling circuit, an input equalizing ring and an output stabilizing ring; comprising 9 external terminals: a positive input voltage terminal, a negative input voltage terminal, a positive output voltage terminal, a negative output voltage terminal, a positive signal input terminal, a negative signal input terminal, a positive signal output terminal, a negative signal output terminal, and an output voltage sampling terminal;
the connection relation is as follows: the input end of the main power circuit is connected with a positive input voltage terminal and a negative input voltage terminal, and the output end of the main power circuit is connected with a positive output voltage terminal and a negative output voltage terminal; the input end of the input isolation sampling circuit is connected with a positive input voltage terminal and a negative input voltage terminal, the negative output end of the input isolation sampling circuit is simultaneously connected with a negative output voltage terminal and a negative signal output terminal, the positive output end of the input isolation sampling circuit is simultaneously connected with one input end of the positive signal output terminal and one input end of the input equalizing ring, the other input end of the input equalizing ring is connected with the positive signal input terminal, the third input end of the output equalizing ring is connected with the negative signal input terminal, and the output end of the input equalizing ring is connected with one input end of the loop isolation circuit; the output voltage sampling terminal is connected to an output voltage stabilizing ring, and the output end of the output voltage stabilizing ring is connected to the other input end of the loop isolation circuit; the output end of the loop isolation circuit is connected to the main power circuit after sequentially passing through the primary side isolation circuit, the secondary side isolation circuit and the control driving circuit;
the functions of each terminal are as follows: a positive input voltage terminal and a negative input voltage terminal for inputting a voltage; a positive output voltage terminal and a negative output voltage terminal for outputting a voltage; the signal input terminal is positive and the signal input terminal is negative, and is used for inputting the equalizing ring to receive external signals; the signal output terminal is positive and the signal output terminal is negative and is used for isolating the sampling circuit to output a sampling signal; an output voltage sampling terminal for inputting a voltage to be sampled;
the functions of each unit circuit are as follows:
the main power circuit performs isolation transformation on the input voltage to obtain output voltage;
a control driving circuit for providing a switch control signal for a power switch of the main power circuit;
the primary side and secondary side isolation circuit is used for carrying out isolation transmission on the switch control signals;
an output voltage stabilizing ring for controlling the output voltage to be stable;
the input isolation sampling circuit is used for collecting input voltage and outputting a sampling signal to the positive of the signal output terminal;
inputting a grading ring, comparing the magnitude of the sampling signal with the magnitude of an external signal, and controlling the magnitude of input voltage;
and the loop isolation circuit isolates the output voltage-stabilizing ring from the input voltage-stabilizing ring.
2. The power conversion module of claim 1, wherein: the negative output voltage terminal, the signal input terminal, and the signal output terminal are multiplexed by the negative 3 external terminals.
3. The power conversion module according to claim 1 or 2, characterized in that: the main power circuit adopts an asymmetric half-bridge flyback topology.
4. A power conversion module according to claim 3, characterized in that: the driving pulse signals of the two switching tubes in the asymmetric half-bridge flyback topology are staggered by a dead time for preventing common short circuit.
5. The power conversion module of claim 4, wherein: the dead time is 300nS.
6. The power conversion module according to claim 1 or 2, characterized in that: and the output voltage sampling terminal is connected with the negative output voltage terminal to shield the function of the output voltage stabilizing ring.
7. The power conversion module according to claim 1 or 2, characterized in that: and connecting the positive output voltage terminal and the negative output voltage terminal of the signal input terminal, and shielding the function of the input equalizing ring.
8. A power supply system, characterized in that: the power conversion module according to claim 1 or claim 2, wherein N is a natural number greater than 1, and the connection relationship is as follows: the positive input voltage terminal of the first power conversion module is the positive input end of the power supply system, the negative input voltage terminal of the first power conversion module is connected with the positive input voltage terminal of the second power conversion module, the negative input voltage terminal of the second power conversion module is connected with the positive input voltage terminal of the third power conversion module, and so on, the negative input voltage terminal of the N-1 th power conversion module is connected with the positive input voltage terminal of the N-th power conversion module, and the negative input voltage terminal of the N-th power conversion module is used as the negative input end of the power supply system; the positive output voltage terminals of the N power conversion modules are connected and then used as the positive output end of the power supply system, and the negative output voltage terminals of the N power conversion modules are connected and then used as the negative output end of the power supply system; the signal output terminal of the first power conversion module is suspended, the signal input terminal of the first power conversion module is connected with the signal output terminal of the second power conversion module, the signal input terminal of the second power conversion module is connected with the signal output terminal of the third power conversion module, and so on, the signal input terminal of the N-1 th power conversion module is connected with the signal output terminal of the N-th power conversion module, and the signal input terminal of the N-th power conversion module is connected with the negative output end of the power supply system; the output voltage sampling terminals of the N-th power conversion module are connected with the positive output end of the power supply system, and the output voltage sampling terminals of the other N-1 power conversion modules are connected with the negative output end of the power supply system.
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| CN107370387B (en) * | 2017-08-09 | 2023-10-20 | 广州金升阳科技有限公司 | Power conversion module and power supply system formed by serial-parallel connection of power conversion modules |
| CN108322032A (en) * | 2018-03-15 | 2018-07-24 | 广州金升阳科技有限公司 | A kind of power-supply system output overvoltage protection circuit and its control method |
| CN108512397B (en) * | 2018-03-29 | 2023-09-08 | 广州金升阳科技有限公司 | Power supply module, power supply system composed of power supply module and control method of power supply system |
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| US7773395B2 (en) * | 2007-02-21 | 2010-08-10 | The Aerospace Corporation | Uniform converter input voltage distribution power system |
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| CN107026580A (en) * | 2017-05-19 | 2017-08-08 | 南京理工大学 | A kind of output same-phase control method of ISOP distributed inverters system |
| CN107294391B (en) * | 2017-08-09 | 2020-02-14 | 广州金升阳科技有限公司 | Power conversion module and power supply system composed of same |
| CN107370387B (en) * | 2017-08-09 | 2023-10-20 | 广州金升阳科技有限公司 | Power conversion module and power supply system formed by serial-parallel connection of power conversion modules |
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| CN202889201U (en) * | 2012-08-28 | 2013-04-17 | 华南理工大学 | High-power LLC resonant full-bridge converter based on DSP |
| CN102904454A (en) * | 2012-10-11 | 2013-01-30 | 南京航空航天大学 | Efficient insulation DC (direct-current) converter system in photovoltaic power generation system |
| CN207283410U (en) * | 2017-08-09 | 2018-04-27 | 广州金升阳科技有限公司 | A kind of power conversion module and the power-supply system being made of the power conversion module connection in series-parallel |
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