CN110797856A - Power supply device control method and power supply device - Google Patents
Power supply device control method and power supply device Download PDFInfo
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- CN110797856A CN110797856A CN201910979116.7A CN201910979116A CN110797856A CN 110797856 A CN110797856 A CN 110797856A CN 201910979116 A CN201910979116 A CN 201910979116A CN 110797856 A CN110797856 A CN 110797856A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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Abstract
The application discloses power supply control method and power supply equipment, the power supply equipment comprises a plurality of power supply modules, each power supply module comprises a control circuit and a switch device connected between a current-sharing bus and a ground wire, the control circuit is used for controlling the on-off of the switch device, and the current-sharing bus is provided with preset voltage. The method specifically comprises the following steps: for each control circuit, when the control circuit is initialized, the switching device is controlled to be conducted to ground the current-sharing bus, then after the power module is started, the switching device is controlled to be disconnected to enable the current-sharing bus to be disconnected from the ground, and then whether the voltage of the current-sharing bus is smaller than the preset voltage or not is judged; and finally, when the voltage of the current equalizing bus is greater than or equal to the preset voltage, controlling the power supply module to output electric energy. In this embodiment, multiplexing of the current-sharing bus and the synchronous on-off bus is realized by setting the switching device, so that the hardware structure of the whole power supply device is simplified.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a power supply device control method and a power supply device.
Background
When the load is supplied with power, the power supply modules are designed in parallel in order to ensure high-power output. When a plurality of power modules are operated in parallel, the output voltage of each power module is not completely consistent due to the difference between the power modules and the difference between the contact impedances of the power modules and the brace, so that the operating load current of each power module cannot be completely consistent. Therefore, under the condition of heavy load, the problem that one power module is subjected to overcurrent protection, and then the other power modules are shut down due to overcurrent protection is easily caused, that is, the startup time and the shutdown time of different power modules are not consistent.
Disclosure of Invention
In order to overcome the above-mentioned defects in the prior art, the present invention provides a power supply device control method and a power supply device.
In a first aspect, an object of the present application is to provide a power supply apparatus control method, where the power supply apparatus includes a plurality of power supply modules, each of the power supply modules includes a control circuit and a switch device, the switch device is connected between a current-sharing bus and a ground line, the control circuit is configured to control on/off of the switch device, a preset voltage is set on the current-sharing bus, and the method includes:
for each control circuit, controlling the switch device to be conducted to ground the current-sharing bus when the control circuit is initialized, wherein the power module initialization comprises configuring a port and a register of the power module;
after the power module is started, controlling the switching device to be disconnected so as to enable the current sharing bus to be grounded;
judging whether the voltage of the current equalizing bus is smaller than the preset voltage or not;
and if the voltage of the current equalizing bus is greater than or equal to the preset voltage, controlling the power supply module to output electric energy.
Optionally, before the determining whether the voltage of the current equalizing bus is less than the preset voltage, the method further includes:
judging whether a starting-up command is detected, wherein the starting-up command is used for controlling whether the power supply module is allowed to output electric energy;
the step of judging whether the voltage of the current equalizing bus is less than the preset voltage comprises the steps of,
and if the starting-up command is detected, judging whether the voltage of the current equalizing bus is smaller than the preset voltage.
Optionally, before the step of controlling the switching device to be turned off to disconnect the current sharing bus from the ground after the power module is started, the method further includes:
acquiring the running state parameters of the power supply module;
starting the power supply module according to the running state parameters;
the operation state parameters are data representing the operation state of the power supply module, and include input voltage, output current and temperature of the power supply module.
Optionally, the step of starting the power module according to the operating state parameter includes:
judging whether the power module has a fault according to the running state parameters;
and if the power supply module has no fault, the power supply module is started.
Optionally, the step of determining whether the power module has a fault according to the operating state parameter includes:
judging whether the input voltage is within a first preset voltage range, whether the output voltage is within a second preset voltage range, whether the output current is within a preset current range and whether the temperature is lower than a preset temperature;
if the input voltage is in a first preset voltage range, the output voltage is in a second preset voltage range, the output current is in the preset current range, and the temperature is smaller than the preset temperature, the power module does not have faults.
Optionally, the step of controlling the power module to output power includes:
calculating a duty cycle from the input voltage and the output voltage of the power module;
and controlling the power supply module to output an output voltage consistent with the duty ratio.
Optionally, after the step of controlling the power module to output the electric power, the method further includes:
after any power supply module judges that a shutdown instruction exists, if the shutdown instruction exists, the switching device is controlled to be conducted to ground the current-sharing bus;
for each control circuit, detecting the voltage of the current equalizing bus;
if the voltage of the current equalizing bus is smaller than the preset voltage, controlling the power supply module to stop outputting the electric energy;
the shutdown instruction is an instruction for controlling the control circuit of the power supply device to stop outputting electric energy.
Another object of the present application is to provide a power supply apparatus, the power supply apparatus includes a plurality of power modules, every the power module includes control circuit and switching device, the switching device is connected between the busbar and the ground wire flow equalize, control circuit is used for control switching device's break-make, set up preset voltage on the busbar flow equalize.
Optionally, an initial state of the switching device is an off state, and the initial state is a state before the power module is started.
Optionally, the switch device is a fully-controlled switch, the fully-controlled switch includes a control end, a high-voltage end and a low-voltage end, the control end of the switch device is connected to the output port of the control circuit, the low-voltage end of the switch device is connected to the ground, and the high-voltage end of the switch device is connected to the current-sharing bus.
Compared with the prior art, the embodiment of the application has the following beneficial effects:
in the embodiment of the application, a switch device capable of controlling the voltage of the current-sharing bus is added on a power module in power equipment, the current-sharing bus is grounded through controlling the switch device, then the switch device is controlled to enable the current-sharing bus to be grounded, and when the current-sharing bus is grounded, the power module is started to output electric energy. When the current-sharing bus is grounded, the voltage value on the current-sharing bus is increased, the control circuit of each power module can almost simultaneously acquire the increased voltage on the current-sharing bus and control the output voltage of the power module according to the increased voltage on the current-sharing bus, therefore, the embodiment can realize that each power module simultaneously starts to output electric energy, namely, each power module synchronously outputs electric energy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a structural diagram of controlling an output voltage by a synchronization signal according to an embodiment of the present disclosure;
FIG. 2 is a graph I comparing the variation of the output power voltage and the output voltage provided by the embodiment of the present application;
FIG. 3 is a graph showing a comparison between the output power voltage and the output voltage according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power supply apparatus according to an embodiment of the present application;
fig. 5 is a first flowchart illustrating a power supply device control method according to an embodiment of the present disclosure;
fig. 6 is a second flowchart illustrating a power supply device control method according to an embodiment of the present application;
fig. 7 is a third schematic flowchart of a power supply device control method according to an embodiment of the present application;
fig. 8 is a fourth flowchart illustrating a power supply device control method according to an embodiment of the present application.
Icon: 1-a synchronization circuit; 2-a synchronous bus; 3-a power supply module; 31-a control circuit; 32-a sampling circuit; 4-a current-sharing bus; 5-switching device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
When the load is supplied with power, the power modules 3 are designed in parallel in order to ensure high power output. When the plurality of power modules 3 are operated in parallel, the output voltage of each power module 3 is not completely consistent due to the difference between the power modules 3 and the difference between the contact impedances of the power modules 3 and the brace, so that the operating load current of each power module 3 cannot be completely consistent. Therefore, in the case of heavy load, it is easy toThe problem that one power module 3 is subjected to overcurrent protection, and further, the other power modules 3 are sequentially subjected to overcurrent protection to shut down is easily caused. One reason for this problem is that, in each power module 3, the variation of the auxiliary power supply is inconsistent and the accuracy of the auxiliary power supply voltage is also inconsistent, and therefore, the variation in the magnitude of the auxiliary voltage and the accuracy of the auxiliary power supply voltage cause inconsistency between the time when the power module 3 starts outputting power and the time when it stops outputting power. That is, when the power modules 3 are controlled to start outputting power and stop outputting power, the controller operates under the auxiliary voltage, and the value of the auxiliary voltage has a large influence on the output result of the controller. To solve this problem, it is a common practice to add a synchronization signal generation circuit and a synchronization bus 2 so as to control the output voltage of each power module 3 by a synchronization signal. Referring to FIG. 1, in FIG. 1, Sync represents an input port of a controller for inputting a synchronization signal, IshareThe sampling current acquisition device represents a voltage signal of the current-sharing bus 4 acquired by sampling current, and AD is an input port of the controller for inputting the voltage signal of the current-sharing bus 4 acquired by sampling current.
Taking the voltage level of the auxiliary voltage as 3.3 volts as an example, each individual power supply has the following problems due to the difference of its components: the rising slopes of the auxiliary power supplies of 3.3V are inconsistent; the accuracy of the auxiliary power supply voltage is not uniform, for example, the auxiliary power supply voltage of one part of the power supply modules 3 is equal to 3.25V, and the auxiliary power supply voltage of the other part of the power supply modules 3 is equal to 3.35V. The inconsistency of the 3.3V voltage precision causes deviation of the internal calculation reference of the digital power supply chip, and further influences the precision of the sampling voltage signal of the digital power supply chip.
Referring to fig. 2, fig. 2 is a graph comparing the change of the auxiliary power voltage and the output voltage caused by calculating the reference deviation, wherein the abscissa of the two coordinate systems represents time, the ordinate of the upper coordinate system represents the auxiliary power voltage, and the ordinate of the lower coordinate system represents the voltage output by the power module, i.e., the power output voltage. The auxiliary voltage causes the digital control time sequence to generate obvious time delay, the rising slope of the 3.3V voltage is fast, and the digital power supply outputs electric energy firstly; and the electric energy is output after the rising slope is slow. This results in a significant deviation of the output voltage of each individual power module 3 during the initial power output phase of the power supply device.
Referring to fig. 3, fig. 3 is a graph comparing the variation of the auxiliary power voltage and the output voltage caused by the accuracy of the auxiliary voltage sampling voltage signal. The abscissa of the two coordinate systems represents time, the ordinate of the upper coordinate system represents the auxiliary power supply voltage, and the ordinate of the lower coordinate system represents the voltage output by the power supply module, i.e., the power supply output voltage. The accuracy of the sampling voltage signals of the digital power supply chip is inconsistent, the judgment time for starting to output the electric energy is inconsistent, and different power supply modules 3 can be considered to obtain different judgment conditions for starting to output the electric energy at the same time, so that different power supply modules 3 can send different commands for starting to output the electric energy. And thus the output voltages of different power modules 3 cannot be kept completely consistent.
Therefore, a plurality of power modules 3 are connected in parallel, and the deviation of the digital power supply voltage directly affects the moment when the power modules 3 start to output electric energy and the amplitude of the output voltage at the same moment. The output voltage of each module cannot be completely consistent, so that the output load current capability of each module is different. Wherein each dashed box represents a power module 3. In order to solve the problem that the power supply device cannot normally operate due to the overcurrent generated in the other power supply modules 3 caused by the non-uniform current in the parallel power supply modules 3, the time for starting and stopping the output of the power supply modules 3 needs to be controlled. Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply apparatus using a synchronous bus 2 in the prior art. In the prior art, in order to solve the problem that the time for starting to output electric energy by each power module 3 in the power supply device is inconsistent, a synchronous bus 2 is separately arranged, so that each power module 3 is controlled to synchronously start to output electric energy or synchronously stop outputting electric energy by a synchronous signal in the synchronous bus 2. However, the addition of a separate synchronization bus 2 makes the circuit configuration of the power supply apparatus more complicated and costly.
Please refer to fig. 4, fig. 4 is a schematic structural diagram of a power supply apparatus capable of solving the above problems provided by the embodiment of the present application, where the power supply apparatus includes a plurality of power supply modules 3, each power supply module 3 includes a control circuit 31 and a switching device 5, each power supply module 3 may further include a power converter and other circuit structures, the switching device 5 is connected between a current-sharing bus 4 and a ground line, the control circuit 31 is configured to control on/off of the switching device 5, and a preset voltage is set on the current-sharing bus 4.
In this embodiment, the control circuit 31 is further configured to control the output voltage of the power module 3. The control circuit 31 includes a controller on which an input port for inputting data and an output port for outputting a signal are arranged. The controller may be, but is not limited to, a Digital control chip such as a single chip microcomputer or a DSP (Digital Signal Processing).
In this embodiment, the current-sharing bus 4 is connected to the output terminals of the power modules 3, and generates a current-sharing signal according to the output voltage of each power module 3.
In this embodiment, the switch device 5 is connected between the controller and the current-sharing bus bar 4, so that the controller can control the on/off of the switch device 5, and further, the voltage on the current-sharing bus bar 4 is controlled to control the output voltage of the power module 3. Therefore, multiplexing of the current-sharing bus 4 (serving as both the current-sharing bus 4 and the synchronous bus 2) can be realized, so that the current-sharing bus 4 can provide a reference point for adjusting the voltage of the power module 3 and also can provide a reference point for controlling whether the power module 3 outputs voltage, the synchronous circuit 1 and the synchronous bus 2 (a synchronous on-off bus) are omitted, and the circuit structure is simplified. The cost of the power supply apparatus can be reduced. In addition, because each power module 3 begins to output electric energy and is realized according to the voltage on the bus 4 that flow equalizes, when the voltage on the bus 4 that flow equalizes changes, each power module 3 can detect the voltage change on the bus 4 that flow equalizes simultaneously almost immediately, consequently, the problem of time delay can also be avoided to this embodiment, improves power equipment's reliability.
Optionally, in this embodiment, the switch device 5 is a circuit breaker or a fully-controlled switch, wherein the fully-controlled switch includes, but is not limited to, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), a GTO (Gate-off thyristor), a triode, and the like. For example, the GTO adopted by the switching device 5 can reduce the time for which the power supply apparatus controls the output of electric power, and improve the response efficiency of the power supply apparatus.
The ground line refers to a potential point with a voltage of 0V or other potential less than a preset voltage.
Optionally, in this embodiment, an initial state of the switching device 5 is an off state, and the initial state is a state before the power module 3 is started. For example, when the switching device 5 is a circuit breaker, the circuit breaker is in an open state in an initial state, and when the switching device 5 is a fully-controlled switch, the fully-controlled switch is in an off state in the initial state, that is, the switching device 5 is in an open state.
Optionally, in this embodiment, when the preset voltage is set, the current-sharing bus 4 may be connected to a constant-voltage power supply, so that the voltage of the constant-voltage power supply is used as the preset voltage of the current-sharing bus 4.
Optionally, in this embodiment, the switch device 5 is a fully-controlled switch, the fully-controlled switch includes a control end, a high-voltage end, and a low-voltage end, the control end of the switch device 5 is connected to the output port of the control circuit 31, the low-voltage end of the switch device 5 is connected to a ground, and the high-voltage end of the switch device 5 is connected to the current-sharing bus 4.
Taking an N-channel enhancement MOSFET as an example, wherein a control end of the N-channel MOSFET is grounded, and a high voltage end and a low voltage end are respectively and correspondingly connected with the current sharing bus 4 and the ground wire.
Optionally, in this embodiment, the current sharing bus bar further includes a sampling circuit 32, and the sampling circuit 32 is connected between the input port of the controller and the current sharing bus bar 4. The sampling circuit 32 is configured to collect a voltage value on the current-sharing bus 4, generate a voltage signal according to the voltage value, and send the voltage signal to the control circuit 31 through the input port.
Wherein the sampling circuit 32 may be a prior art sampling circuit 32.
Optionally, in this embodiment, each power module 3 may further include a selection button. And the selection key is connected with the controller, so that the starting command can be obtained through the state of the selection key.
Referring to fig. 5, fig. 5 is a flowchart of a power supply device control method provided in an embodiment of the present application, where the method may be applied to the power supply device, and the method includes steps S110 to S140.
Step S110, for each control circuit 31, when the control circuit 31 is initialized, the switching device 5 is controlled to be turned on to ground the current-sharing bus 4, where the initialization of the power module 3 includes configuring a port and a register of the power module 3.
The ports include input ports and output ports.
Step S120, after the power module 3 is started, controlling the switching device 5 to be turned off to disconnect the current sharing bus 4 from the ground.
Step S130, determining whether the voltage of the current equalizing bus 4 is less than the preset voltage.
Step S140, if the voltage of the current equalizing bus 4 is greater than or equal to the preset voltage, controlling the power module 3 to output electric energy.
Optionally, in this embodiment, before the step S130, a step of determining whether a power-on command is detected is further included, where the power-on command is used to control whether the power module 3 is allowed to output the electric energy.
The step of judging whether the voltage of the current-sharing bus 4 is smaller than the preset voltage comprises the step of judging whether the voltage of the current-sharing bus 4 is smaller than the preset voltage if the starting-up command is detected.
In this embodiment, before the switch command is detected, a user may manually operate the control structure of each module, so that selection of a control module for operation in the power supply device may be implemented. For example, the control structure is a key connected to the control module, and after the power supply device is powered on, if the key has an operation of being pressed once, the control circuit 31 may obtain a signal corresponding to the operation and thinks that the power-on command has been obtained, that is, when detecting whether there is a switch command, it is sufficient if there is a signal corresponding to the key-pressing operation.
Referring to fig. 6, in the present embodiment, before the step S120, the method further includes a step S210 and a step S220.
Step S210, obtaining the operating state parameters of the power module 3.
Step S220, the power module 3 is started according to the operating state parameter.
The operating state parameters are data representing the operating state of the power module 3, and include the input voltage, the output current, and the temperature of the power module 3.
Optionally, in this embodiment, step S220 specifically includes determining whether the power module 3 has a fault according to the operating state parameter. If the power module 3 has no fault, the power module 3 is started up.
In this embodiment, in step S120, in the step of controlling the switching device 5 to be turned off after the power module 3 is started up to disconnect the current-sharing bus 4 from the ground, it may be determined whether the power module 3 is started up by detecting whether an operation state parameter of the power module meets a preset condition requirement, and if the operation state parameter meets the preset condition after the operation state parameter is detected, the switching device 5 may be controlled to be turned off to disconnect the current-sharing bus 4 from the ground.
The present embodiment is used for determining the fault state of the power module 3 to ensure that the power module 3 can stably operate.
Optionally, in this embodiment, the determining whether the power module 3 has a fault according to the operating state parameter includes determining whether an input voltage, an output current, and a temperature meet preset conditions.
Specifically, whether the input voltage is within a first preset voltage range or not, whether the output voltage is within a second preset voltage range or not, whether the output current is within a preset current range or not, and whether the temperature is lower than a preset temperature or not are judged.
If the input voltage is in the first preset voltage range, just output voltage is in the second preset voltage range, just output current is in the preset current range, just the temperature is less than preset temperature, then power module 3 does not have the trouble.
The embodiment is used for judging the operation state of the power module 3 according to the overvoltage condition and the undervoltage condition of the input voltage, the overvoltage condition and the undervoltage condition of the output voltage, the overcurrent condition of the output current and the temperature condition of the power module 3.
Referring to fig. 7, step S140 includes steps S141 to S142.
Step S141, calculating a duty ratio according to the input voltage and the output voltage of the power module 3.
Step S142, controlling the power module 3 to output an output voltage consistent with the duty ratio.
Optionally, the formula for calculating the duty cycle is:
Duty＝k*Vo/Vin
where Duty is a Duty ratio, k is a ratio of a primary winding to a secondary winding of a transformer in the power module 3, Vo is an output voltage of the power module 3, and Vin is an input voltage of the power module 3.
Referring to fig. 8, optionally, in the present embodiment, after step S140, the method further includes step S150 to step S170.
Step S150, after determining that there is a shutdown instruction in any power module 3, if there is a shutdown instruction, the switching device 5 is controlled to be turned on to ground the low current sharing bus 4.
Step S160, detecting the voltage of the current equalizing bus 4 for each control circuit 31.
Step S170, when the voltage of the current equalizing bus 4 is smaller than a preset voltage, controlling the power module 3 to stop outputting the electric energy.
That is, if the voltage of the current equalizing bus 4 is detected to be less than the preset voltage, the power module 3 is controlled to stop outputting the voltage.
The shutdown instruction is an instruction for controlling the control circuit 31 of the power supply device to stop outputting electric energy.
The embodiment is used for synchronously controlling each power module 3 to stop supplying the output voltage to the load when the power supply equipment needs to stop supplying power to the load after supplying power to the load.
To sum up, in this application embodiment, add a switching device that can control the voltage of the bus that flow equalizes on the power module in power equipment, at first through control switching device with the bus ground connection that flow equalizes, then control switching device makes the bus that flow equalizes remove ground connection again to when the bus that flow equalizes removes ground connection, start power module output electric energy simultaneously. When the current-sharing bus is grounded, the voltage value on the current-sharing bus is increased, the control circuit of each power module can almost simultaneously acquire the increased voltage on the current-sharing bus and control the output voltage of the power module according to the increased voltage on the current-sharing bus, so that each power module can simultaneously start to output electric energy even if each power module simultaneously outputs electric energy. In addition, in this application embodiment, because the output voltage of the voltage control power module that directly adopts the generating line that flow equalizes who obtains, that is to say, multiplexing generating line and synchronous bus that flow equalizes, consequently, can simplify power equipment's structure, make power module can the synchronous output, improve control efficiency simultaneously.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A power supply equipment control method is characterized in that the power supply equipment comprises a plurality of power supply modules, each power supply module comprises a control circuit and a switch device, the switch device is connected between a current-sharing bus and a ground wire, the control circuit is used for controlling the on-off of the switch device, a preset voltage is set on the current-sharing bus, and the method comprises the following steps:
for each control circuit, controlling the switch device to be conducted to ground the current-sharing bus when the control circuit is initialized, wherein the power module initialization comprises configuring a port and a register of the power module;
after the power module is started, controlling the switching device to be disconnected so as to enable the current sharing bus to be grounded;
detecting whether the voltage of the current equalizing bus is smaller than the preset voltage or not;
and when the voltage of the current equalizing bus is greater than or equal to the preset voltage, controlling the power supply module to output electric energy.
2. The power supply device control method according to claim 1, wherein before the step of determining whether the voltage of the current share bus is less than the preset voltage, the method further comprises the steps of:
judging whether a starting-up command is detected, wherein the starting-up command is used for controlling whether the power supply module is allowed to output electric energy;
the step of judging whether the voltage of the current equalizing bus is less than the preset voltage comprises the steps of,
and if the starting-up command is detected, judging whether the voltage of the current equalizing bus is smaller than the preset voltage.
3. The power supply apparatus control method according to claim 1, wherein before the step of controlling the switching device to be turned off to disconnect the current share bus from ground after the power supply module is started, the method further comprises:
acquiring the running state parameters of the power supply module;
starting the power supply module according to the running state parameters;
the operation state parameters are data representing the operation state of the power supply module, and include input voltage, output current and temperature of the power supply module.
4. The power supply apparatus control method according to claim 3, wherein the step of starting the power supply module in accordance with the operation state parameter includes:
judging whether the power module has a fault according to the running state parameters;
and if the power supply module has no fault, the power supply module is started.
5. The power supply apparatus control method according to claim 4, wherein the step of determining whether the power supply module has a fault according to the operation state parameter includes:
judging whether the input voltage is within a first preset voltage range, whether the output voltage is within a second preset voltage range, whether the output current is within a preset current range and whether the temperature is lower than a preset temperature;
if the input voltage is in a first preset voltage range, the output voltage is in a second preset voltage range, the output current is in the preset current range, and the temperature is smaller than the preset temperature, the power module does not have faults.
6. The power supply apparatus control method according to any one of claims 3 to 5, wherein the step of controlling the power supply module to output power includes:
calculating a duty cycle from the input voltage and the output voltage of the power module;
and controlling the power supply module to output an output voltage consistent with the duty ratio.
7. The power supply apparatus control method according to claim 6, wherein after the step of controlling the power supply module to output the electric power, the method further comprises:
judging whether a shutdown instruction exists in any power supply module, and controlling a switching device to be conducted to ground a current-sharing bus if the shutdown instruction exists;
for each control circuit, detecting the voltage of the current equalizing bus;
if the voltage of the current equalizing bus is smaller than the preset voltage, controlling the power supply module to stop outputting the electric energy;
the shutdown instruction is an instruction for controlling the control circuit of the power supply device to stop outputting electric energy.
8. A power supply device using the control method according to any one of claims 1 to 7, wherein the power supply device comprises a plurality of power supply modules, each power supply module comprises a control circuit and a switching device, the switching device is connected between a current-sharing bus and a ground wire, the control circuit is used for controlling the switching device to be switched on and off, and a preset voltage is set on the current-sharing bus.
9. The power supply apparatus according to claim 8, wherein an initial state of the switching device is an off state, the initial state being a state before completion of startup of the power supply module.
10. The power supply apparatus according to claim 8 or 9, wherein the switch device is a fully-controlled switch, the fully-controlled switch includes a control terminal, a high voltage terminal and a low voltage terminal, the control terminal of the switch device is connected to the output port of the control circuit, the low voltage terminal of the switch device is connected to the ground, and the high voltage terminal of the switch device is connected to the current-sharing bus.
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