CN109639115B - Power supply circuit - Google Patents

Power supply circuit Download PDF

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CN109639115B
CN109639115B CN201811611364.8A CN201811611364A CN109639115B CN 109639115 B CN109639115 B CN 109639115B CN 201811611364 A CN201811611364 A CN 201811611364A CN 109639115 B CN109639115 B CN 109639115B
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power
power supply
circuit
switch circuit
module
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CN109639115A (en
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仝箫
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New H3C Security Technologies Co Ltd
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New H3C Security Technologies Co Ltd
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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
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The embodiment of the application provides a power supply circuit, including at least two power supply modules, control circuit and four at least switch circuits, each power supply module is connected with two at least load units the same respectively through switch circuit, each switch circuit connects a power supply module and connects a load unit, control circuit is connected with each switch circuit, and the connected state of each switch circuit is controlled, so that each power supply module supplies power for at least one load unit and the ratio of the output power of this power supply module and the rated power of this power supply module is greater than preset load factor threshold, and each load unit that is supplied power by only one power supply module. Through the scheme, the ratio of the output power of each power supply module to the rated power of the power supply module is greater than the load rate threshold value, compared with the prior art, each power supply module keeps higher power supply efficiency, the power supply modules are integrally improved, and the power consumption is reduced.

Description

Power supply circuit
Technical Field
The present application relates to the field of electronic circuit technology, and more particularly, to a power supply circuit.
Background
The power supply voltage required on the circuit board is typically 3.3V or other lower voltage levels, and typically the circuit board can be powered from the power grid, which typically provides 220V ac. Therefore, before the power grid is connected to the circuit board, the power supply module with the voltage reduction function is required to perform voltage reduction processing, so that the 220V voltage of the power grid is converted into the voltage with the low voltage level required by the circuit board.
The power efficiency is an important parameter of the power module, and is defined as a ratio of output power to input power, and is used for representing the conversion efficiency of the power module to electric energy. Higher power efficiency means higher conversion efficiency of the power module, and less power is consumed in the power module.
At present, in order to improve the reliability of power supply, two power modules are generally configured, and the two power modules simultaneously supply power to a load. When one power module breaks down, the other power module can also continuously supply power for the load, and then the normal operation of the load is guaranteed. However, when two power modules supply power simultaneously, the output power phase difference of the two power modules is often large, and if the output power of a certain power module is small, the power efficiency of the power module is reduced, so that the overall power efficiency of the two power modules is reduced, and the overall power consumption of the two power modules is increased.
Disclosure of Invention
An object of the embodiments of the present application is to provide a power circuit to solve the problem of low power efficiency in the case of simultaneous power supply of multiple power supplies. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a power supply circuit, where the power supply circuit includes at least two power supply modules, a control circuit, and at least four switch circuits;
each power supply module is respectively connected with at least two same load units through a switch circuit, and each switch circuit is connected with one power supply module and one load unit;
the control circuit is connected with each of the at least four switch circuits and controls the connection state of each switch circuit, so that each power supply module supplies power to at least one load unit, the ratio of the output power of the power supply module to the rated power of the power supply module is larger than a preset load rate threshold, and each load unit supplied with power is supplied with power by only one power supply module.
Optionally, the at least two power modules include a power module a and a power module B, the at least four switch circuits include a first group of switch circuits and a second group of switch circuits, the power module a is connected to the at least two load units through the first group of switch circuits, and the power module B is connected to the at least two load units through the second group of switch circuits.
Optionally, the first group of switching circuits includes a switching circuit a and a switching circuit B, the second group of switching circuits includes a switching circuit C and a switching circuit D, and the at least two load units include a load unit a and a load unit B;
the power supply module A is connected with the load unit A through the switch circuit A and is connected with the load unit B through the switch circuit B; the power module B is connected with the load unit A through the switch circuit C and is connected with the load unit B through the switch circuit D.
Optionally, the control circuit is configured to control both the switch circuit a and the switch circuit D to be closed, and control both the switch circuit B and the switch circuit C to be opened; alternatively, the first and second electrodes may be,
the control circuit is used for controlling the switch circuit B and the switch circuit C to be closed and controlling the switch circuit A and the switch circuit D to be opened.
Optionally, the control circuit is further configured to detect whether the connected power modules are faulty, and when it is detected that a power module in the power modules supplying power to the load unit is faulty, control the switch circuit connected between the load unit supplied with power by the faulty power module and the power module that is not faulty to be closed, and control the switch circuit in the closed state connected to the faulty power module to be opened.
Optionally, the at least two power modules include a power module a and a power module B, and the at least four switch circuits include a switch circuit a, a switch circuit B, a switch circuit C, and a switch circuit D; the power supply module A is connected with the load unit A through the switch circuit A, and the power supply module A is connected with the load unit B through the switch circuit B; the power supply module B is connected with the load unit A through the switch circuit C, and the power supply module B is connected with the load unit B through the switch circuit D;
when the switch circuit A and the switch circuit D are both closed and the switch circuit B and the switch circuit C are both opened; the control circuit is used for controlling the switch circuit C to be closed and controlling the switch circuit A to be opened when the power module A is detected to be in fault; and when the power module B is detected to be in fault, controlling the switch circuit B to be closed and controlling the switch circuit D to be opened.
Optionally, the at least two power modules include a power module a and a power module B, and the at least four switch circuits include a switch circuit a, a switch circuit B, a switch circuit C, and a switch circuit D; the power supply module A is connected with the load unit A through the switch circuit A, and the power supply module A is connected with the load unit B through the switch circuit B; the power supply module B is connected with the load unit A through the switch circuit C, and the power supply module B is connected with the load unit B through the switch circuit D;
when the switch circuit B and the switch circuit C are both closed and the switch circuit A and the switch circuit D are both opened; the control circuit is used for controlling the switch circuit D to be closed and controlling the switch circuit B to be opened when the power module A is detected to be in fault; and when the power module B is detected to be in fault, controlling the switch circuit A to be closed and controlling the switch circuit C to be opened.
Optionally, a difference between output powers of any two power modules in the at least two power modules is smaller than a preset difference threshold.
In the technical scheme provided by the embodiment of the application, the power supply circuit comprises at least two power supply modules, a control circuit and at least four switch circuits, each power supply module is respectively connected with at least two load units which are the same through the switch circuits, each switch circuit is connected with one power supply module and one load unit, the control circuit is connected with each switch circuit of the at least four switch circuits and controls the connection state of each switch circuit, so that each power supply module supplies power for at least one load unit, the ratio of the output power of the power supply module to the rated power of the power supply module is greater than a preset load rate threshold, and each power-supplied load unit is only supplied with power by one power supply module. Through the technical scheme provided by the embodiment of the application, when each power supply module supplies power to the load unit, the ratio of the output power of each power supply module to the rated power of the power supply module is greater than the load rate threshold value.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph illustrating the relationship between the power efficiency and the load factor according to an embodiment of the present disclosure
Fig. 2 is a first circuit diagram of a power circuit provided in an embodiment of the present application;
fig. 3 is a second circuit diagram of a power circuit provided in an embodiment of the present application;
fig. 4 is a first current flow diagram of a power circuit provided in an embodiment of the present application;
fig. 5 is a second current flow diagram of a power circuit provided in an embodiment of the present application;
FIG. 6 is a third circuit diagram of a power circuit provided in an embodiment of the present application;
fig. 7 is a third current flow diagram of a power circuit provided in an embodiment of the present application;
fig. 8 is a fourth current flow diagram of a power supply circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The applicant, when studying the prior art, found that the following problems exist: when two power supply modules supply power simultaneously, the output power of the two power supply modules is often different greatly, so that the overall power efficiency of the two power supply modules is reduced, and the overall power consumption of the two power supply modules is increased.
Through analysis, the applicant finds that: the power efficiency is related to the load ratio of the power module, which is the ratio of the output power of the power module to the rated power (i.e. the quotient of the output power divided by the rated power). Fig. 1 is a graph showing a relationship between power efficiency and a load factor of a power module, and it can be seen from fig. 1 that when the load factor is less than 20%, the power efficiency is low, and the magnitude of the power efficiency improvement is large as the load factor increases, and after 20%, the magnitude of the power efficiency improvement is small and is basically in a stable state. And when two power supply modules supply power simultaneously and the output power of two power supply modules differs greatly, the load factor of the power supply module with small output power is very small, even less than 10%, and it can be known from the above fig. 1 that the power supply efficiency of the power supply module is very low at this moment, so that the overall power supply efficiency of the two power supply modules is reduced, and the overall power consumption of the two power supply modules is increased.
In order to solve the problem of low power efficiency under the condition of simultaneous power supply of multiple power supplies, the embodiment of the application provides a power supply circuit, which comprises at least two power supply modules, a control circuit and at least four switch circuits;
each power supply module is respectively connected with at least two same load units through a switch circuit, and each switch circuit is connected with one power supply module and one load unit;
the control circuit is connected with each of the at least four switch circuits and controls the connection state of each switch circuit, so that each power supply module supplies power to at least one load unit, the ratio of the output power of the power supply module to the rated power of the power supply module is larger than a preset load rate threshold, and each load unit supplied with power is supplied with power by only one power supply module.
Through the technical scheme provided by the embodiment of the application, when each power supply module supplies power to the load unit, the ratio of the output power of each power supply module to the rated power of the power supply module is greater than the load rate threshold, and the load rate threshold may be 20% or any value greater than 20% and smaller than 100%, such as 30%, 40%, 50%, 60%, 70%, 80%, 90%. Compared with the prior art, each power module keeps higher power efficiency, and for the power modules as a whole, the power efficiency is improved and the power consumption is reduced.
In an embodiment of the present application, as shown in fig. 2, the power circuit includes at least two power modules, a control circuit, and at least four switch circuits.
The switching circuit can be set by self-definition, the switching circuits included in the power supply circuit can adopt the same circuit structure, and can also adopt different circuit structures, and the switching circuit is not limited here, and can realize the on-off state of the circuit where the switching circuit is located. In one example, the switching circuit can control the on-off state of the line by controlling the closing and opening of the switch. When one switch circuit is closed, the line where the switch circuit is located is in a connected state.
In one implementation, the switch circuit may employ a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), and the time required for switching is short based on the MOSFET, which may reach a nanosecond level.
Each power module can perform voltage conversion, for example, the input end of the power module is connected with 220V alternating current, and the output end of the power module outputs 12V direct current. For another example, the input end of the power module is connected to 240V dc, and the output end outputs 10V dc. The voltage at the input end and the voltage at the output end of each power supply module are not limited to the above examples, and may also be direct current or alternating current of other voltage classes, and are not limited herein. The power modules included in the power circuit may be the same or different, and are not limited herein. The power modules are the same, which means that parameters such as model, rated power, rated current, input voltage, output voltage and the like are the same.
Each power supply module in the power supply circuit is respectively connected with at least two same load units through a switch circuit. Each switch circuit is connected with one power supply module and one load unit. That is, one power module may be connected to a plurality of switch circuits, and one load unit may also be connected to a plurality of switch circuits, but one switch circuit may be connected to only one power module and one load unit.
Taking fig. 3 as an example, the power circuit includes two power modules, four switch circuits and two load units, for the switch circuit, the switch circuit a is only connected to the power module a and the load unit a, the switch circuit B is only connected to the power module a and the load unit B, the switch circuit C is only connected to the power module B and the load unit a, and the switch circuit D is only connected to the power module B and the load unit B.
The control circuit is connected with each of the at least four switch circuits and can control the opening or closing of each switch circuit.
The control circuit can be set by self-definition. In one implementation, the control circuit may be implemented by a programmable logic device, which may effectively reduce cost.
Taking fig. 3 as an example, the switching circuit included in the power supply circuit is: the control circuit is respectively connected with the switch circuit A, the switch circuit B, the switch circuit C and the switch circuit D.
The connection state of each switch circuit is controlled by the control circuit, so that each power supply module supplies power to at least one load unit, the ratio of the output power of the power supply module to the rated power of the power supply module is larger than a preset load rate threshold, and each load unit supplied with power is supplied with power by only one power supply module.
Wherein, the load rate threshold value can be set by self. For example, as shown in the graph of the relationship between the power supply efficiency and the load factor in fig. 1, when the load factor is greater than 20%, the change in the power supply efficiency is small, and therefore, the load factor threshold may be set to 20%.
For each power module, the ratio of the output power of the power module to the rated power is greater than the preset load factor threshold, so that the load factor of each power module is greater than the preset load factor threshold. Thus, as can be seen from the relationship between the load factor and the power efficiency shown in fig. 1, when the load factor threshold is not less than 20%, each power module maintains a high power efficiency, and the power efficiency of the power module as a whole is also high, and further, the power consumption is reduced.
In one embodiment, the power circuit includes at least two power modules, and a difference between output powers of any two power modules is smaller than a preset difference threshold.
The preset difference threshold can be set by self-definition, and the smaller the preset difference threshold is, the smaller the difference between the output powers of the power supply modules is, the closer the power supply efficiency of the power supply modules is, and further, the high power supply efficiency of each power supply module is kept.
In one implementation, when the preset difference threshold is 0, it indicates that the output powers of the power modules in the power circuit are equal, that is, the input powers of the load units connected to and supplying power to the power modules are equal. In this case, when the power ratings of the power supply modules are equal, the load factors of the power supply modules are equal.
For example, the power module in the power circuit includes a power module a and a power module B, and the load unit in the power circuit includes a load unit a and a load unit B, where rated powers of the power module a and the power module B are the same, and a power when the load unit a is supplied with power is equal to an input power when the load unit B is supplied with power. When the power module A supplies power to the load unit A and the power module B supplies power to the load unit B, the load rate of the power module A is equal to that of the power module B.
The output power of each power module is the input power of the load unit connected with and supplying power to the power module, so that the difference of the input power of the load unit connected with and supplying power to each power module is smaller than the preset difference threshold value, and at the moment, the difference of the output power between the power modules is smaller than the preset difference threshold value.
In order to facilitate the setting of the load units connected to each power module, the power of each load unit when being supplied with power needs to be acquired. The power obtained when the load unit is powered can be obtained in at least the following two ways. One way of obtaining the measurement result may be that the measurement result is obtained by measuring the load unit when the load unit is connected to the power supply and is powered. In one implementation, when the load unit is connected to the power source and powered, the current and the voltage of the load unit are measured respectively, and the measured current and the measured voltage are multiplied, so that the power of the load unit when powered can be obtained.
In another obtaining manner, each load unit is provided with relevant parameter information, such as a rated voltage, a rated current, and the like, the rated voltage of the load unit is multiplied by the rated current, and the obtained power can be regarded as the power when the load unit is powered.
The power obtaining method when the load unit is powered is not limited to the above two methods, and other obtaining methods may be included, which are not limited herein.
The load units in the power circuit may be divided by loads in the same circuit board, for example, the power circuit includes two power modules, and the total load of one circuit board includes 10 loads, respectively M1, M2, M3, M4, M5, M6, M7, M8, M9 and M10, where each load has a power of 10 watts when powered. The total load of the circuit board is divided into two parts according to the power, so that M1, M2, M3, M4 and M5 can be used as a load unit and powered by one power supply module, and M6, M7, M8, M9 and M10 can be used as another load unit and powered by another power supply module.
In addition, the load units in the power circuit can be divided by the loads of different circuit boards. For example, the power supply circuit includes two load units: the load unit A is the load of the circuit board a, and the load unit B is the sum of the load of the circuit board B and the load of the circuit board c.
In one implementation, the power circuit provided in the embodiment of the present application includes two power modules, namely a power module a and a power module B. The at least four switch circuits that this power supply circuit includes, divide into two sets according to the quantity of power module and divide into: the first group of switch circuits and the second group of switch circuits belong to the same group of switch circuits which are connected with the same power supply module, and the power supply modules connected with the switch circuits of different groups are different.
In one implementation, the first set of switching circuits is connected to power module a and the second set of switching circuits is connected to power module B. Namely, the power module A is respectively connected with at least two load units through a first group of switch circuits, and the power module B is respectively connected with at least two load units through a second group of switch circuits.
Based on that each switch circuit is connected with one power supply module and one load unit, the number of the switch circuits included in the first group of switch circuits is the same as that of the load unit units, and the number of the switch circuits included in the second group of switch circuits is the same as that of the load unit units.
For example, when there are two load units, the first group of switch circuits includes two switch circuits, and the second group of switch circuits includes two switch circuits.
In addition, the switching circuits included in the first group of switching circuits and the switching circuits included in the second group of switching circuits may not be the same switching circuit, i.e., each switching circuit may only belong to one group of switching circuits. For example, as shown in fig. 3, the switch circuit a and the switch circuit B are connected to the power supply module a, and therefore, the switch circuit a and the switch circuit B belong to the first group of switch circuits. The switching circuits C and D are connected to the power supply module B, and therefore belong to the second group of switching circuits.
In one embodiment, the power circuit includes four switching circuits, respectively: the circuit comprises a switch circuit A, a switch circuit B, a switch circuit C and a switch circuit D, wherein the switch circuit A and the switch circuit B belong to a first group of switch circuits, and the switch circuit C and the switch circuit D belong to a second group of switch circuits. In addition, the load unit includes two, load unit a and load unit B respectively.
As shown in fig. 3, the power supply module a is connected to each load unit through a switch circuit a and a switch circuit B, and specifically, the power supply module a is connected to the load unit a through the switch circuit a and connected to the load unit B through the switch circuit B. The power module B is connected to each load unit through the switch circuit C and the switch circuit D, and specifically, the power module B is connected to the load unit a through the switch circuit C and connected to the load unit B through the switch circuit D.
On the basis of the above embodiments, in one embodiment, the control circuit controls the on and off of the switch circuit a, the switch circuit B, the switch circuit C and the switch circuit D, so that the power module a and the power module B supply power to the load unit a and the load unit B.
In one implementation, the control circuit may control both the switch circuit a and the switch circuit D to be closed, and control both the switch circuit B and the switch circuit C to be open. As shown in table 1 below:
TABLE 1
Figure BDA0001924816230000091
At this time, the current flows in a schematic diagram as shown in fig. 4, in which a solid line indicates a line of a path, that is, a line in which current flows, and a dotted line indicates a broken line, that is, a line in which no current flows. The power supply module A supplies power to the load unit A through the switch circuit A, and the current flow direction is as follows: the power supply module A, the switch circuit A and the load unit A. The power supply module B supplies power to the load unit B through the switch circuit D, and the current flow direction is as follows: power module B-switching circuit D-load unit B.
In another implementation manner, the control circuit may control both the switch circuit B and the switch circuit C to be turned on, and control both the switch circuit a and the switch circuit D to be turned off. As shown in table 2 below:
TABLE 2
Figure BDA0001924816230000101
At this time, as shown in the schematic current flow diagram of fig. 5, the power module a supplies power to the load unit B through the switch circuit B, and the current flow direction is as follows: the power supply module A, the switch circuit B and the load unit B. The power supply module B supplies power to the load unit A through the switch circuit C, and the current flow direction is as follows: power module B-switching circuit C-load unit a.
Through the embodiment, when each power supply module supplies power to the load unit, the ratio of the output power of each power supply module to the rated power of the power supply module is greater than the load rate threshold value. And the two power supply modules are both in a working state, the two power supply modules are mutually standby power supplies at the moment, and when any one of the two power supply modules fails, the control circuit is used for switching the circuits, so that the two load units are powered by the other power supply module which normally works. In the process of switching the circuit of the control circuit, because the other power supply module is in the working state, the time required for starting the power supply module from the off state to the normal working state is saved, the time required for switching the circuit is greatly reduced, the influence on the power supply of the load unit caused by the circuit switching is reduced, and the normal power supply of the load unit is ensured.
In one embodiment, as shown in fig. 6, a control circuit is connected to each power module in the power circuit, and the control circuit can also detect whether the connected power module fails.
In one implementation, each power module is connected to a detection circuit, and each detection circuit is connected to a control circuit. The detection circuit can detect the output voltage of the connected power supply module, and further realize the detection of the connected power supply module. When the detection circuit detects that the output voltage of the connected power supply module is abnormal, the fault of the power supply module can be judged, the detection circuit sends a fault signal to the control circuit, and the control circuit can determine the power supply module with the fault.
Optionally, the detection circuit includes a voltage dividing resistor and an AD (Analog-to-Digital) chip. The detection circuit comprises at least two divider resistors, the power module is connected with the divider resistors, and preset voltage is obtained through the divider resistors. The voltage dividing resistor is connected with the AD chip, the preset voltage obtained on the voltage dividing resistor is used as the input voltage of the AD chip, and whether the power module has a fault or not can be judged according to the high and low levels output by the AD chip.
In one implementation, the output voltage of the power module is converted into a preset voltage by dividing the output voltage of the power module through a voltage dividing resistor, and the preset voltage is used as the input voltage of the AD chip. For the AD chip, a low level is output when the input voltage is lower than a preset voltage threshold, and a high level is output when the input voltage is not lower than the voltage threshold. The AD chip outputs a low level when the output voltage of the power module is smaller than the output voltage threshold; and when the output voltage of the power supply module is not less than the output voltage threshold value, the AD chip outputs a high level. Based on this, it is possible to determine that the power module malfunctions when the AD chip outputs a low level.
For example, the output voltage of the power module is 12V, and the detection circuit includes two voltage dividing resistors: r1 and R2, wherein the ratio of the resistance value of R1 to the resistance value of R2 is 1: 5. The 12V voltage output by the power supply module is loaded on the total resistor formed by serially connecting R1 and R2, the voltage on R1 can be 2V, and thus the 12V voltage is divided and converted into the preset voltage of 2V through the two voltage dividing resistors. The voltage of 2V was used as the input voltage of the AD chip connected to R1. The voltage threshold of the AD chip is 1.76V, that is, when the input voltage of the AD chip is lower than 1.76V, a low level is output, and when the input voltage is not lower than 1.76V, a high level is output. According to the ratio of the preset voltage to the voltage threshold, the output voltage threshold for the power module can be obtained according to the following formula:
Figure BDA0001924816230000111
where V is the output voltage threshold. Based on the above formula, the output voltage threshold is 10.56V, that is, when the output voltage of the power module is lower than 10.56V, the AD chip outputs a low level, which indicates that the power module fails; when the output voltage of the power supply module is not lower than 10.56V, the AD chip outputs a high level, which indicates that the power supply module is normal. Thus, when the output voltage of the power module is 12V, the AD chip outputs a high level, and when the output voltage of the power module is lower than 10.56V when the power module fails, the AD chip outputs a low level, indicating that the power module fails.
On the basis of the foregoing embodiment, in an embodiment, the control circuit may be further configured to perform line switching when it is detected that a power module of the at least two power modules fails, so that the power module that normally operates may continue to supply power to the load unit connected to the failed power module.
For example, in fig. 4, the power module a supplies power to the load unit a, the power module B supplies power to the load unit B, when the control circuit detects a fault of the power module a, the control circuit performs line switching, and after the line switching, as shown in fig. 7, the power module B may supply power to the load unit a and the load unit B.
Specifically, the control circuit may control a switching circuit connected between a load unit supplied with power from the failed power supply module and the non-failed power supply module to be closed, and control a switching circuit in a closed state connected to the failed power supply module to be opened. When one switch circuit is closed, the line where the switch circuit is located is in a connected state.
The control circuit controls the switch circuit connected between the load unit powered by the failed power module and the non-failed power module to be closed, and the following three conditions can be included.
In the first case, when there is only one non-failed power module in the power circuit, the control circuit directly controls the non-failed power module to supply power to the load unit supplied by the failed power module, that is, controls the switch circuit connected between the load unit supplied by the failed power module and the non-failed power module to be closed.
For example, the power circuit includes a power module a and a power module B, the power module a supplies power to the load unit a, the power module B supplies power to the load unit B, and when the control circuit detects a fault of the power module a, the control circuit directly controls the switch circuit between the power module B and the load unit a to be closed, so that the power module B supplies power to the load unit a and the load unit B.
In a second case, when there are at least two non-failed power modules in the power circuit, the control circuit may control only one of the power modules to supply power to the load unit supplied by the failed power module. Specifically, any one of the plurality of power modules that have not failed may be selected, and the switching circuit connected between the power module and the load unit powered by the failed power module is controlled to be closed, so that the power module continues to supply power to the load unit powered by the failed power module.
For example, the power circuit includes a power module a, a power module B, and a power module C, where the power module a supplies power to the load unit a, the power module B supplies power to the load unit B, and the power module C supplies power to the load unit C. When the control circuit detects that the power module A has a fault, the power module B and the power module C both work normally at the moment, and then the control circuit can select the power module C to supply power for the load unit A, namely the control circuit controls the switch circuit between the power module C and the load unit A to be closed, so that the power module C supplies power for the load unit A and the load unit C.
In a third case, when there are at least two power modules that have not failed in the power circuit, the control circuit may only control a plurality of power modules therein to simultaneously supply power to the load unit to be supplied, where the plurality of power modules that are controlled may be a part of the power modules that have not failed, or may be all of the power modules that have not failed.
Specifically, a plurality of power modules can be selected from the power modules which do not fail, and the switching circuit connected between the plurality of power modules and the load unit powered by the power module which fails is controlled to be closed, so that the plurality of power modules can simultaneously supply power to the load unit powered by the power module which fails.
For example, the power circuit includes a power module a, a power module B, and a power module C, where the power module a supplies power to the load unit a, the power module B supplies power to the load unit B, and the power module C supplies power to the load unit C. When the control circuit detects that the power supply module A has a fault, the power supply module B and the power supply module C both work normally at the moment, and the control circuit can control the switch circuit between the power supply module B and the load unit A to be closed and control the switch circuit between the power supply module C and the load unit A to be closed. Thus, the power supply module B and the power supply module C jointly supply power to the load unit A.
In one embodiment, when a power module in a power circuit comprises a power module a and a power module B, a switching circuit comprises a switching circuit a, a switching circuit B, a switching circuit C and a switching circuit D; the power supply module A is connected with the load unit A through the switch circuit A, and the power supply module A is connected with the load unit B through the switch circuit B; the power supply module B is connected with the load unit A through the switch circuit C, and the power supply module B is connected with the load unit B through the switch circuit D.
In the power supply circuit, the switch circuit a and the switch circuit D are both closed, and the switch circuit B and the switch circuit C are both open, that is, as shown in fig. 4, the power supply module a supplies power to the load unit a through the switch circuit a, and the power supply module B supplies power to the load unit B through the switch circuit D.
When the control circuit detects that the power module A has a fault, the control circuit can control the switch circuit C to be closed and control the switch circuit A to be opened. The states of the switching circuits before and after the power module a fails are shown in table 3 below:
TABLE 3
Switch electric deviceRoad A Switch circuit B Switch circuit C Switch circuit D
Before power module A fails Closure is provided Disconnect Disconnect Closure is provided
After power module A fails Disconnect Disconnect Closure is provided Closure is provided
At this time, the current of the power supply circuit flows to the state shown in fig. 7, the control circuit controls the switch circuit a to be turned off, and the power supply module a turns off the line for supplying power to the load unit a through the switch circuit a. And the switch circuit C is closed, so that the power module B supplies power to the load unit A through the switch circuit C, and at the moment, the power module B supplies power to the load unit A and the load unit B simultaneously. The current flow direction of the power module B for supplying power to the load unit a is as follows: the power supply module B, the switching circuit C and the load unit A, wherein the current flow direction of the power supply module B for supplying power to the load unit B is as follows: power module B-switching circuit D-load unit B.
When the control circuit detects that the power module B has a fault, the control circuit may control the switch circuit B to be closed and control the switch circuit D to be opened. The states of the switching circuits before and after the power module B fails are shown in table 4 below:
TABLE 4
Switch circuit A Switch circuit B Switch circuit C Switch circuit D
Before failure of power module B Closure is provided Disconnect Disconnect Closure is provided
After power module B fails Closure is provided Closure is provided Disconnect Disconnect
At this time, the current of the power supply circuit flows to the state shown in fig. 8, the control circuit controls the switch circuit D to be turned off, and the power supply module B is turned off through the switch circuit D to supply power to the load unit B. And the switch circuit B is closed, so that the power supply module A supplies power to the load unit B through the switch circuit B, and at the moment, the power supply module A supplies power to the load unit A and the load unit B simultaneously. The current flow direction of the power module A for supplying power to the load unit A is as follows: the power supply module A, the switch circuit A and the load unit A, wherein the current flow direction of the power supply module A for supplying power to the load unit B is as follows: the power supply module A, the switch circuit B and the load unit B.
Through the embodiment, the power module A and the power module B in the power circuit are both in working states, and at the moment, the power module A and the power module B are mutually standby power supplies. When any one of the load units has a fault, the control circuit controls the corresponding switch circuit to be closed, so that the two load units are both supplied with power by the other power module which normally works. The time for the switch circuit to execute the closing operation is short, so that the time for switching the load unit from the failed power supply module to the normally working power supply module is short, and the normal power supply of the load unit is ensured.
In addition, the control circuit controls the switch connected with the power module with the fault to be in short circuit and disconnected, so that the power module with the fault is isolated from the load unit, and the power module with the fault is prevented from influencing the normal operation of the load unit.
In one embodiment, when a power module in a power circuit comprises a power module a and a power module B, a switching circuit comprises a switching circuit a, a switching circuit B, a switching circuit C and a switching circuit D; the power supply module A is connected with the load unit A through the switch circuit A, and the power supply module A is connected with the load unit B through the switch circuit B; the power supply module B is connected with the load unit A through the switch circuit C, and the power supply module B is connected with the load unit B through the switch circuit D.
In the power supply circuit, the switch circuit B and the switch circuit C are both closed, and the switch circuit a and the switch circuit D are both open, that is, as shown in fig. 5, the power supply module a supplies power to the load unit B through the switch circuit B, and the power supply module B supplies power to the load unit a through the switch circuit C.
When the control circuit detects that the power module A has a fault, the control circuit can control the switch circuit D to be closed and control the switch circuit B to be opened. The states of the switching circuits before and after the power module a fails are shown in table 5 below:
TABLE 5
Switch circuit A Switch circuit B Switch circuit C Switch circuit D
Before power module A fails Disconnect Closure is provided Closure is provided Disconnect
After power module A fails Disconnect Disconnect Closure is provided Closure is provided
At this time, the current of the power supply circuit flows to the state shown in fig. 7, the control circuit controls the switch circuit B to be switched off, and the power supply module a switches off the line for supplying power to the load unit B through the switch circuit B. And the switch circuit D is closed, so that the power module B supplies power to the load unit B through the switch circuit D, and at the moment, the power module B supplies power to the load unit A and the load unit B simultaneously.
When the control circuit detects that the power module B has a fault, the control circuit may control the switch circuit a to be closed and control the switch circuit C to be opened. The states of the switching circuits before and after the power module B fails are shown in table 6 below:
TABLE 6
Switch circuit A Switch circuit B Switch circuit C Switch circuit D
Before failure of power module B Disconnect Closure is provided Closure is provided Disconnect
After power module B fails Closure is provided Closure is provided Disconnect Disconnect
At this time, the current of the power supply circuit flows to the state shown in fig. 8, the control circuit controls the switch circuit C to be turned off, and the power supply module B turns off the line for supplying power to the load unit a through the switch circuit C. And the switch circuit A is closed, so that the power module A supplies power to the load unit A through the switch circuit A, and at the moment, the power module A supplies power to the load unit A and the load unit B simultaneously.
In the technical scheme provided by the embodiment of the application, the power supply circuit comprises at least two power supply modules, a control circuit and at least four switch circuits, each power supply module is respectively connected with at least two load units which are the same through the switch circuits, each switch circuit is connected with one power supply module and one load unit, the control circuit is connected with each switch circuit of the at least four switch circuits and controls the connection state of each switch circuit, so that each power supply module supplies power for at least one load unit, the ratio of the output power of the power supply module to the rated power of the power supply module is greater than a preset load rate threshold, and each power-supplied load unit is only supplied with power by one power supply module. Through the technical scheme provided by the embodiment of the application, when each power supply module supplies power to the load unit, the ratio of the output power of each power supply module to the rated power of the power supply module is greater than the load rate threshold value.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (8)

1. A power supply circuit, characterized in that the power supply circuit comprises at least two power supply modules, a control circuit and at least four switch circuits;
each power supply module is respectively connected with at least two same load units through a switch circuit, and each switch circuit is connected with one power supply module and one load unit;
the control circuit is connected with each of the at least four switch circuits and controls the connection state of each switch circuit, so that each power supply module supplies power to at least one load unit, the ratio of the output power of the power supply module to the rated power of the power supply module is larger than a preset load rate threshold, and each load unit supplied with power is supplied with power by only one power supply module.
2. The power supply circuit of claim 1, wherein the at least two power modules comprise a power module A and a power module B, and the at least four switching circuits comprise a first group of switching circuits and a second group of switching circuits, the power module A is connected to the at least two load units through the first group of switching circuits, and the power module B is connected to the at least two load units through the second group of switching circuits.
3. The power supply circuit of claim 2, wherein the first set of switching circuits comprises switching circuit a and switching circuit B, the second set of switching circuits comprises switching circuit C and switching circuit D, and the at least two load units comprise load unit a and load unit B;
the power supply module A is connected with the load unit A through the switch circuit A and is connected with the load unit B through the switch circuit B; the power module B is connected with the load unit A through the switch circuit C and is connected with the load unit B through the switch circuit D.
4. The power supply circuit according to claim 3,
the control circuit is used for controlling the switch circuit A and the switch circuit D to be closed and controlling the switch circuit B and the switch circuit C to be opened; alternatively, the first and second electrodes may be,
the control circuit is used for controlling the switch circuit B and the switch circuit C to be closed and controlling the switch circuit A and the switch circuit D to be opened.
5. The power supply circuit of claim 1, wherein the control circuit is further configured to detect whether the connected power modules are faulty, and when a fault is detected in one of the power modules supplying power to the load unit, control the switch circuit connected between the load unit supplied with power from the faulty power module and the non-faulty power module to be closed, and control the switch circuit connected to the faulty power module in the closed state to be opened.
6. The power supply circuit of claim 5, wherein the at least two power supply modules comprise a power supply module A and a power supply module B, and the at least four switching circuits comprise a switching circuit A, a switching circuit B, a switching circuit C, and a switching circuit D; the power supply module A is connected with the load unit A through the switch circuit A, and the power supply module A is connected with the load unit B through the switch circuit B; the power supply module B is connected with the load unit A through the switch circuit C, and the power supply module B is connected with the load unit B through the switch circuit D;
when the switch circuit A and the switch circuit D are both closed and the switch circuit B and the switch circuit C are both opened; the control circuit is used for controlling the switch circuit C to be closed and controlling the switch circuit A to be opened when the power module A is detected to be in fault; and when the power module B is detected to be in fault, controlling the switch circuit B to be closed and controlling the switch circuit D to be opened.
7. The power supply circuit of claim 5, wherein the at least two power supply modules comprise a power supply module A and a power supply module B, and the at least four switching circuits comprise a switching circuit A, a switching circuit B, a switching circuit C, and a switching circuit D; the power supply module A is connected with the load unit A through the switch circuit A, and the power supply module A is connected with the load unit B through the switch circuit B; the power supply module B is connected with the load unit A through the switch circuit C, and the power supply module B is connected with the load unit B through the switch circuit D;
when the switch circuit B and the switch circuit C are both closed and the switch circuit A and the switch circuit D are both opened; the control circuit is used for controlling the switch circuit D to be closed and controlling the switch circuit B to be opened when the power module A is detected to be in fault; and when the power module B is detected to be in fault, controlling the switch circuit A to be closed and controlling the switch circuit C to be opened.
8. The power supply circuit according to any one of claims 1-7, wherein the difference between the output powers of any two of the at least two power supply modules is less than a preset difference threshold.
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