CN110365198B - AC/DC power supply switching control system and method of inverter - Google Patents
AC/DC power supply switching control system and method of inverter Download PDFInfo
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- CN110365198B CN110365198B CN201910745152.7A CN201910745152A CN110365198B CN 110365198 B CN110365198 B CN 110365198B CN 201910745152 A CN201910745152 A CN 201910745152A CN 110365198 B CN110365198 B CN 110365198B
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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
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Abstract
The invention provides an alternating current-direct current power supply switching control system and method of an inverter. And converting the output voltage signal into a control signal for controlling the on or off state of the alternating current power supply module. The control system directly converts the output voltage signal of the direct current power supply module into a control signal for controlling the working state of the alternating current power supply module, namely, the control system directly utilizes the voltage signal with larger power output by the direct current power supply module to control the working state of the alternating current power supply module. Therefore, the processes of signal acquisition and analysis and the like of a digital chip are not needed, so that an I/O interface of the digital chip is not needed to be occupied, the driving power of a control signal is not needed to be increased through a driving circuit, and the hardware cost is reduced.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to an alternating current/direct current power supply switching control system and method of an inverter.
Background
In the field of photovoltaic power generation, fans, drivers, controllers, and the like of inverters need to be powered by auxiliary power sources.
The auxiliary power supply of the inverter generally includes a direct current auxiliary power supply and an alternating current auxiliary power supply. In different situations, different auxiliary power supplies are adopted to supply power to the inverter, for example, when the inverter is connected to the grid for power generation, the inverter is supplied by the direct-current auxiliary power supply, and in order to reduce standby loss of the alternating-current power supply, the alternating-current auxiliary power supply is turned off when the direct-current auxiliary power supply supplies power; when the inverter is in standby, the AC auxiliary power supply is needed to supply power in order to meet the functions of PID repair, inverter software upgrade and the like at night. Namely, after the dc auxiliary power supply is started, the ac auxiliary power supply needs to be controlled to be shut down; after the dc auxiliary power supply is turned off, the ac auxiliary power supply needs to be controlled to turn on. The current control scheme adopts IC chips such as DSP or ARM, needs to detect the working state of the DC auxiliary power supply, and realizes the on-off control of the auxiliary power supply through an I/O interface of the chip. Meanwhile, since the driving capability of the chip is limited, the driving circuit is usually designed. This approach takes up a limited number of I/O interfaces on the chip and requires the design of driver circuits, increasing hardware costs.
Disclosure of Invention
In view of this, an object of the present invention is to provide an ac/dc power switching control system and method for an inverter, so as to solve the technical problems in the related art that the implementation of the on/off control of an auxiliary power through an I/O interface of a chip causes high hardware cost and occupies a limited number of I/O interfaces on the chip, and the disclosed specific technical solution is as follows:
in a first aspect, the present invention provides an ac/dc power switching control system for an inverter, including: the power supply switching control module comprises a direct current power supply module, an alternating current power supply module and a power supply switching control module;
the input end of the direct current power supply module is connected with a direct current power supply, and the output end of the direct current power supply module is connected with a load;
the input end of the alternating current power supply module is connected with an alternating current power supply, and the output end of the alternating current power supply module is connected with the load;
the input end of the power supply switching control module is connected with the output end of the direct-current power supply module, the output end of the power supply switching control module is connected with the control end of the alternating-current power supply module, and the power supply switching control module is used for converting an output voltage signal of the direct-current power supply module into a control signal for controlling the conduction or the turn-off of the alternating-current power supply module.
In a possible implementation manner, the power switching control module is specifically configured to:
when the output voltage signal of the direct current power supply module is a high level signal, converting the output voltage signal into an alternating current power supply turn-off control signal, wherein the alternating current power supply turn-off control signal is used for controlling the alternating current power supply module to be turned off;
when the output voltage signal of the direct current power supply module is a low level signal, the output voltage signal is converted into an alternating current power supply switching control signal, and the alternating current power supply switching control signal is used for controlling the conduction of the alternating current power supply module.
In another possible implementation manner, the power switching control module is an optical coupler;
the input end of the optical coupler is connected with the output end of the direct-current power supply module;
the collector of the phototriode in the optical coupler inputs a set voltage signal, the emitter is connected with the control end of the alternating current power supply module, and the emitter is connected with the grounding end through a first divider resistor.
In yet another possible implementation manner, the power switching control module is an optical coupler;
the input end of the optical coupler is connected with the output end of the direct-current power supply module;
and the collector of the phototriode in the optical coupler is connected with the control end of the alternating current power supply module, the collector inputs a high-level signal through a second divider resistor, and the emitter of the phototriode is connected with a grounding end.
In another possible implementation manner, the power switching control module is a relay;
the coil of the relay is connected with the output end of the direct current power supply module;
one end of a normally open contact of the relay is connected with the control end of the alternating current power supply module, the normally open contact is connected with the grounding end through a third voltage dividing resistor, and the other end of the normally open contact inputs a set voltage signal.
In yet another possible implementation manner, the power switching control module is a relay;
the coil of the relay is connected with the output end of the direct current power supply module;
one end of a normally open contact of the relay is connected with the control end of the alternating current power supply module, a high level signal is input to the end of the normally open contact through a fourth voltage dividing resistor, and the other end of the normally open contact is connected with the grounding end.
In another possible implementation manner, the power switching control module is a switching tube;
the control end of the switch tube is connected with the output end of the direct-current power supply module, a set voltage signal is input to the first end of the switch tube, the second end of the switch tube is connected with the control end of the alternating-current power supply module, and the second end of the switch tube is connected with the grounding end.
In another possible implementation manner, the switching tube is a metal oxide semiconductor field effect MOS tube, a gate of the MOS tube is the control end, a drain of the MOS tube is the first end, and a source of the MOS tube is the second end;
alternatively, the first and second electrodes may be,
the switch tube is a triode, and the base electrode of the triode is the control end, the collector electrode is the first end, and the emitter electrode is the second end.
In yet another possible implementation manner, the dc power module and the ac power module each include an isolated type conversion topology or a non-isolated type conversion topology;
the isolated transform topology comprises any one of: a Flyback transform topology, a Forward transform topology, a Push-Pull transform topology, a Half-Bridge transform topology;
the non-isolated transform topology comprises any one of the following: buck conversion topology, Boost conversion topology, Buck-Boost conversion topology and Sepic conversion topology.
In a second aspect, the present invention further provides an ac/dc power supply switching control method for an inverter, which is applied to the ac/dc power supply switching control system for an inverter according to any one of possible implementation manners of the first aspect, where the method includes:
collecting an output voltage signal of the direct current power supply module;
when the output voltage signal is a high level signal, converting the output voltage signal into an alternating current power supply turn-off control signal for directly controlling the alternating current power supply module to be turned off;
and when the output voltage signal is a low level signal, converting the output voltage signal into an alternating current power supply switching control signal for directly controlling the alternating current power supply module to supply power.
According to the alternating current-direct current power supply switching control system of the inverter, the input end of the power supply switching control module is directly connected with the output end of the direct current power supply module, namely, the output voltage signal of the direct current power supply module is acquired. And converting the output voltage signal into a control signal for controlling the on or off state of the alternating current power supply module. The control system directly converts the output voltage signal of the direct current power supply module into a control signal for controlling the working state of the alternating current power supply module, namely, the control system directly utilizes the voltage signal with larger power output by the direct current power supply module to control the working state of the alternating current power supply module. Therefore, the processes of signal acquisition and analysis and the like of a digital chip are not needed, so that an I/O interface of the digital chip is not needed to be occupied, the driving power of a control signal is not needed to be increased through a driving circuit, and the hardware cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ac/dc power supply switching control system of an inverter according to the present invention;
FIG. 2 is a schematic structural diagram of an AC/DC power supply switching control system of another inverter according to the present invention;
FIG. 3 is a schematic structural diagram of an AC/DC power switching control system of another inverter according to the present invention;
fig. 4 is a schematic structural diagram of an ac/dc power supply switching control system of another inverter according to the present invention;
FIG. 5 is a schematic structural diagram of an AC/DC power switching control system of another inverter according to the present invention;
FIG. 6 is a schematic structural diagram of an AC/DC power switching control system of another inverter according to the present invention;
FIG. 7 is a schematic structural diagram of an AC/DC power switching control system of another inverter according to the present invention;
fig. 8 is a flowchart of an ac/dc power switching control method of an inverter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Referring to fig. 1, a schematic structural diagram of an ac/dc power supply switching control system of an inverter according to the present invention is shown, where the system includes a dc power supply module 1, an ac power supply module 2, and a power supply switching control module 3.
The input end of the direct current power supply module 1 is connected with a direct current power supply, the output end of the direct current power supply module 1 is connected with a load, and the direct current power supply module 1 obtains the required output voltage Vo1 by controlling the internal switch of the direct current power supply module. In this embodiment, the dc power supply may be a photovoltaic panel.
If the system needs to be isolated, the dc power supply module 1 may adopt isolated conversion topologies such as Flyback, Forward, Push-Pull, Half-Bridge, and the like.
If the system does not need to be isolated, the direct-current power supply module 1 can adopt non-isolated conversion topologies such as Buck, Boost, Buck-Boost, Sepic and the like.
The input end of the alternating current power supply module 2 is connected with an alternating current power supply, the output end of the alternating current power supply module 2 is connected with a load, and the alternating current power supply module 2 obtains the required output voltage Vo2 by controlling an internal switch of the alternating current power supply module.
If the system needs to be isolated, the alternating current power supply module 2 can adopt isolated conversion topologies such as Flyback, Forward, Push-Pull, Half-Bridge and the like.
If the system does not need to be isolated, the alternating current power supply module 2 can adopt non-isolated conversion topologies such as Buck, Boost, Buck-Boost, Sepic and the like.
In the same system, the same topology may be selected for the conversion topologies of the dc power module 1 and the ac power module 2, or different topologies may be adopted, which is not limited herein.
The load of the present invention includes, but is not limited to, a fan, a driver, a controller, and the like of the inverter.
The input end of the power supply switching control module 3 is connected with the output end of the direct current power supply module 1, and the output end is connected with the control end of the alternating current power supply module. The power switching control module 3 is configured to convert an output voltage signal of the dc power module 1 into a control signal for controlling the ac power module 2 to turn on or off.
In one possible implementation manner, when the output voltage signal of the dc power supply module is a high level signal, the output voltage signal is converted into an ac power off control signal, and the ac power off control signal is used to control the ac power supply module to be turned off. When the output voltage signal of the direct current power supply module is a low level signal, the output voltage signal is converted into an alternating current power supply switching control signal, and the alternating current power supply switching control signal is used for controlling the conduction of the alternating current power supply module.
According to the alternating current-direct current power supply switching control system of the inverter, the input end of the power supply switching control module is directly connected with the output end of the direct current power supply module, namely, the output voltage signal of the direct current power supply module is acquired. And converting the output voltage signal into a control signal for controlling the on or off state of the alternating current power supply module. The control system directly converts the output voltage signal of the direct current power supply module into a control signal for controlling the working state of the alternating current power supply module, namely, the control system directly utilizes the voltage signal with larger power output by the direct current power supply module to control the working state of the alternating current power supply module. Therefore, the processes of signal acquisition and analysis and the like of a digital chip are not needed, so that an I/O interface of the digital chip is not needed to be occupied, the driving power of a control signal is not needed to be increased through a driving circuit, and the hardware cost is reduced.
In an application scenario, an ac/dc power switching control system of an inverter needs to isolate a strong current signal and a weak current signal, and in such an application scenario, a power switching control module needs to be implemented by using an isolation device, as shown in fig. 2 to 5, schematic diagrams of implementing the power switching control module by using the isolation device are shown.
Referring to fig. 2, a schematic structural diagram of an ac/dc power switching control system of an inverter according to the present invention is shown, in this embodiment, when a control signal is at a high level, an ac power module is turned off, and a power switching control module is implemented by using an optical coupler.
As shown in fig. 2, the input end of the optical coupler is connected to the output end of the dc power supply module 1, specifically, the input end of the optical coupler is connected to two ends of the light emitting diode, the anode of the light emitting diode is connected to the positive output end of the dc power supply module 1, and the cathode of the light emitting diode is connected to the ground end via the current limiting resistor R1.
The output end of the optical coupler U1 is connected with the control end of the alternating current power supply module 2, and the output side of the optical coupler is a phototriode; specifically, a collector of the phototransistor is used as one output end of the optical coupler to input the set high level signal Vref, an emitter of the phototransistor is used as the other output end of the optical coupler to connect to a control end of the ac power supply module, and the emitter is connected to a ground end via a voltage dividing resistor R2.
Optionally, the system provided in this embodiment may further include a backflow prevention module 4 to prevent one power supply module from outputting backflow energy to another power supply module. The backflow prevention module 4 comprises two unidirectional conducting devices which are connected in reverse.
For example, the backflow prevention module comprises a diode D1 and a diode D2, wherein the anode of D1 is connected to the positive output terminal of the dc power module 1, the cathode of D1 is connected to the cathode of D2, and the anode of D2 is connected to the positive output terminal of the ac power module 2.
The working process of the ac/dc power supply switching control system of the inverter of the embodiment is as follows:
when the voltage output by the photovoltaic panel reaches the starting voltage of the dc power module 1 (for example, during daytime when the photovoltaic panel is working), the dc power module 1 is started, and the output voltage Vo1 at the output end is at a high level. At this time, the optical coupler U1 in the power switching control module 3 is turned on, specifically, the light emitting diode is turned on to emit a corresponding optical signal, the optical signal turns on the phototransistor on the secondary side, at this time, the voltage on R2 is equal to Vref, that is, the control signal Vctrl output by the power switching control module is equal to Vref. In this embodiment, when Vctrl is a high level signal, the ac power module 2 is controlled to be turned off. In this case, the load is supplied with the voltage signal Vo1 output from the dc power supply module 1.
When the voltage output by the photovoltaic panel is too low (for example, when the photovoltaic panel does not work at night), the dc power module 1 is turned off, and the output voltage Vo1 at the output end is at a low level. At this time, the light emitting diode of the optocoupler U1 in the power switching control module 3 is turned off, so that the phototransistor is turned off, and the voltage across the voltage dividing resistor R2 is clamped to 0, i.e. the control signal Vctrl output by the power switching control module is at a low level. The low-level control signal Vctrl controls the ac power supply module 2 to be turned on, and at this time, the voltage signal Vo2 output by the ac power supply module 2 supplies power to the load.
Referring to fig. 3, a schematic structural diagram of another ac/dc power switching control system of an inverter according to the present invention is shown, where a power switching control module in this embodiment is implemented by using an optical coupler, and a difference from the system shown in fig. 2 is that in this embodiment, an ac power module is turned off when a control signal is at a low level.
As shown in fig. 3, the anode of the led in the optocoupler U2 is connected to the positive output terminal of the dc power module 1, and the cathode of the led is connected to the ground terminal via the current limiting resistor R1.
A collector of a photosensitive triode in the optical coupler U2 is connected with one end of a divider resistor R3, a set high-level signal Vref is input into the other end of R3, and the collector is connected with a control end of an alternating-current power supply module; the emitter of the phototriode is connected with the grounding terminal.
When the photovoltaic cell panel works, the output voltage is high, the direct-current power supply module 1 is started, and the output voltage Vo1 of the direct-current power supply module 1 is at a high level. At this time, the optocoupler U2 is turned on, the control signal Vctrl is at a low level, and the ac power module 2 is controlled to be turned off, so that the voltage signal Vo1 output by the dc power module 1 supplies power to the load.
When the voltage output by the photovoltaic cell panel is too low, the dc power module 1 is turned off, and the output voltage Vo1 at the output end is at a low level. At this time, the optocoupler U2 is turned off, the control signal Vctrl is clamped to the high level Vref, the high level control signal Vctrl controls the ac power module 2 to be turned on, and at this time, the voltage signal Vo2 output by the ac power module 2 supplies power to the load.
Referring to fig. 4, a schematic structural diagram of an ac/dc power switching control system of another inverter according to the present invention is shown, where a power switching control module in this embodiment is implemented by using a relay, and in this embodiment, the ac power module is controlled to be turned off when a control signal is at a high level.
As shown in fig. 4, one end of the coil in the relay U3 is connected to the output terminal of the dc power supply module 1, and the other end of the coil is connected to the ground terminal via a current limiting resistor R4. One end of a normally open contact of the relay U3 is connected with the control end of the alternating current power supply module 2, and the normally open contact is connected with the ground end through a voltage dividing resistor R5; the other end of the normally open contact inputs a set high level signal Vref.
When the photovoltaic cell panel works, the output voltage is high, the direct current power supply module 1 is started, and the output voltage Vo1 of the direct current power supply module 1 is at a high level. At this time, the coil of the relay U3 is energized, the normally open contact is closed, the voltage across the voltage dividing resistor R5 is equal to the set high level Vref, that is, the control signal Vctrl is at a high level, the ac power module 2 is controlled to be turned off, and the voltage signal Vo1 output by the dc power module 1 supplies power to the load.
When the voltage output by the photovoltaic panel is too low, the dc power module 1 is turned off and the output voltage Vo1 is at a low level. At this time, the current in the coil of the relay U3 is 0, the normally open contact thereof is opened, and at this time, the voltage across the voltage dividing resistor R5 is clamped to 0, that is, the control signal Vctrl is at a low level, and the ac power supply module 2 is controlled to be turned on, that is, the voltage signal Vo2 output by the ac power supply module 2 supplies power to the load.
Referring to fig. 5, a schematic structural diagram of another ac/dc power switching control system of an inverter according to the present invention is shown, in which a power switching control module in this embodiment is implemented by using a relay, and the ac power module is controlled to be turned off when a control signal is at a low level.
As shown in fig. 5, one end of the coil in the relay U4 is connected to the output end of the dc power supply module, and the other end of the coil is grounded through a current limiting resistor R4. One end of a normally open contact in the relay U4 is connected with the control end of the alternating current power supply module 2, and the normally open contact inputs a set high level signal Vref through a voltage dividing resistor R5; the other end of the normally open contact is grounded.
When the photovoltaic cell panel works, the output voltage is high, the direct-current power supply module 1 is started, and the output voltage Vo1 of the direct-current power supply module 1 is at a high level. At this time, the current in the relay U4 increases, the normally open contact is closed, the voltage across the voltage dividing resistor R5 is clamped to 0, that is, the control signal Vctrl is at a low level, the ac power supply module 2 is controlled to be turned off, and the voltage signal Vo1 output by the dc power supply module 1 supplies power to the load.
When the voltage output by the photovoltaic panel is too low, the dc power module 1 is turned off and the output voltage Vo1 is at a low level. At this time, the current in the coil of the relay U4 is 0, the normally open contact is opened, the voltage across the voltage dividing resistor R5 is Vref, that is, the control signal Vctrl is at a high level, the ac power supply module 2 is controlled to be turned on, and the voltage signal Vo2 output by the ac power supply module 2 supplies power to the load.
In another application scenario, the ac/dc power switching control system of the inverter does not need to be isolated, and in such an application scenario, the power switching control module uses a non-isolated device, as shown in fig. 6 and 7, a schematic diagram of implementing the power switching control module using a non-isolated device is shown.
Referring to fig. 6, a schematic structural diagram of another ac/dc power switching control system of an inverter according to the present invention is shown, where a power switching control module in this embodiment is implemented by using an N-channel MOS transistor.
As shown in fig. 6, the gate of the NMOS transistor Q1 is connected to the output terminal of the dc power module 2 through a current limiting resistor R6, the set high level signal Vref is input to the drain of the Q1, and the source of the Q1 is grounded through a voltage dividing resistor R7.
When the photovoltaic cell panel works, the output voltage is high, the direct current power supply module 1 is started, and the output voltage Vo1 is at a high level. At this time, Q1 is turned on, the voltage across the voltage dividing resistor R7 is equal to the high level signal Vref, i.e., the control signal Vctrl is at a high level, the ac power module 2 is controlled to be turned off, and the voltage signal Vo1 output by the dc power module 1 supplies power to the load.
When the voltage output by the photovoltaic panel is too low, the dc power module 1 is turned off and the output voltage Vo1 is at a low level. At this time, Q1 is turned off, the voltage across the voltage dividing resistor R7 is clamped to 0, that is, the control signal Vctrl is at a low level, and the ac power module 2 is controlled to be turned on, that is, the voltage signal Vo2 output by the ac power module 2 supplies power to the load.
In other possible implementations, the power switching control module 3 may be implemented by using a P-channel MOS transistor, which is not described herein again.
Referring to fig. 7, a schematic structural diagram of an ac/dc power switching control system of another inverter according to the present invention is shown, in which a power switching control module in this embodiment is implemented by using an NPN-type triode.
As shown in fig. 7, the base of the transistor Q2 is connected to the output terminal of the dc power supply module 2 through a current limiting resistor R8, the collector of the transistor Q2 receives a set high level signal Vref, and the emitter of the transistor Q2 is grounded through a voltage dividing resistor R9.
When the photovoltaic cell panel works, the output voltage is high, the direct current power supply module 1 is started, and the output voltage Vo1 is at a high level. At this time, Q2 is turned on, the voltage across the voltage dividing resistor R9 is equal to the high level signal Vref, i.e., the control signal Vctrl is at a high level, the ac power module 2 is controlled to be turned off, and the voltage signal Vo1 output by the dc power module 1 supplies power to the load.
When the voltage output by the photovoltaic panel is too low, the dc power module 1 is turned off and the output voltage Vo1 is at a low level. At this time, Q2 is turned off, the voltage across the voltage dividing resistor R9 is clamped to 0, that is, the control signal Vctrl is at a low level, and the ac power module 2 is controlled to be turned on, that is, the voltage signal Vo2 output by the ac power module 2 supplies power to the load.
In other possible implementations, the power switching control module 3 may be implemented by using a PNP type transistor, which is not described herein again.
On the other hand, the invention also provides an embodiment of an alternating current/direct current power supply switching control method of the inverter.
Referring to fig. 8, a flowchart of an ac/dc power switching control method for an inverter according to the present invention is shown, where the method is applied to the ac/dc power switching control system for an inverter, and the method includes the following steps:
and S110, acquiring an output voltage signal of the direct current power supply module.
And S120, when the output voltage signal is a high-level signal, converting the output voltage signal into an alternating current power supply turn-off control signal for directly controlling the alternating current power supply module to turn off.
And S130, when the output voltage signal is a low-level signal, converting the output voltage signal into an alternating current power supply switching control signal for directly controlling the power supply of the alternating current power supply module.
The alternating current and direct current power supply switching control method of the inverter directly converts the output voltage signal of the direct current power supply module into the control signal for controlling the working state of the alternating current power supply module, namely directly utilizes the voltage signal with larger power output by the direct current power supply module to control the working state of the alternating current power supply module. Therefore, the processes of signal acquisition and analysis and the like of a digital chip are not needed, so that an I/O interface of the digital chip is not needed to be occupied, the driving power of a control signal is not needed to be increased through a driving circuit, and the hardware cost is reduced.
It should be noted that each embodiment in the present specification focuses on differences from other embodiments, and the same and similar parts between the embodiments may be referred to each other.
The device and the modules and sub-modules in the terminal in the embodiments of the present application can be combined, divided and deleted according to actual needs.
The modules or sub-modules described as separate parts may or may not be physically separate, and parts that are modules or sub-modules may or may not be physical modules or sub-modules, may be located in one place, or may be distributed over a plurality of network modules or sub-modules. Some or all of the modules or sub-modules can be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, each functional module or sub-module in the embodiments of the present application may be integrated into one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated into one module. The integrated modules or sub-modules may be implemented in the form of hardware, or may be implemented in the form of software functional modules or sub-modules.
Finally, it should also be 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.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. An alternating current-direct current power supply switching control system of an inverter is characterized by comprising: the power supply switching control module comprises a direct current power supply module, an alternating current power supply module and a power supply switching control module;
the input end of the direct current power supply module is connected with a direct current power supply, and the output end of the direct current power supply module is connected with a load;
the input end of the alternating current power supply module is connected with an alternating current power supply, and the output end of the alternating current power supply module is connected with the load;
the input end of the power supply switching control module is connected with the output end of the direct current power supply module, and the output end of the power supply switching control module is connected with the control end of the alternating current power supply module;
the power supply switching control module is used for converting an output voltage signal of the direct current power supply module into a control signal for controlling the on or off of the alternating current power supply module, and further directly utilizing the voltage signal output by the direct current power supply module to control the working state of the alternating current power supply module; the power supply switching control module is realized by adopting an isolated device or a non-isolated device;
when the output voltage signal of the direct current power supply module is a high level signal, converting the output voltage signal into an alternating current power supply turn-off control signal, wherein the alternating current power supply turn-off control signal is used for controlling the alternating current power supply module to be turned off; when the direct current power supply works, the output voltage of the direct current power supply module is a high level signal;
when the output voltage signal of the direct current power supply module is a low level signal, converting the output voltage signal into an alternating current power supply switching control signal, wherein the alternating current power supply switching control signal is used for controlling the conduction of the alternating current power supply module; when the direct current power supply does not work, the output voltage of the direct current power supply module is a low level signal.
2. The system of claim 1, wherein the power switching control module is an optocoupler;
the input end of the optical coupler is connected with the output end of the direct-current power supply module;
the collector of the phototriode in the optical coupler inputs a set voltage signal, the emitter is connected with the control end of the alternating current power supply module, and the emitter is connected with the grounding end through a first divider resistor.
3. The system of claim 1, wherein the power switching control module is an optocoupler;
the input end of the optical coupler is connected with the output end of the direct-current power supply module;
and the collector of the phototriode in the optical coupler is connected with the control end of the alternating current power supply module, the collector inputs a high-level signal through a second divider resistor, and the emitter of the phototriode is connected with the grounding end.
4. The system of claim 1, wherein the power switching control module is a relay;
the coil of the relay is connected with the output end of the direct current power supply module;
one end of a normally open contact of the relay is connected with the control end of the alternating current power supply module, one end of the normally open contact of the relay is connected with the grounding end through a third voltage dividing resistor, and the other end of the normally open contact inputs a set voltage signal.
5. The system of claim 1, wherein the power switching control module is a relay;
the coil of the relay is connected with the output end of the direct current power supply module;
one end of a normally open contact of the relay is connected with the control end of the alternating current power supply module, a high level signal is input to one end of the normally open contact of the relay through a fourth voltage dividing resistor, and the other end of the normally open contact is connected with a grounding end.
6. The system of claim 1, wherein the power switching control module is a switching tube;
the control end of the switch tube is connected with the output end of the direct-current power supply module, a set voltage signal is input to the first end of the switch tube, the second end of the switch tube is connected with the control end of the alternating-current power supply module, and the second end of the switch tube is connected with the grounding end.
7. The system of claim 6, wherein the switch transistor is a metal oxide semiconductor field effect transistor (MOS) having a gate as the control terminal, a drain as the first terminal, and a source as the second terminal;
or, the switch tube is a triode, and the base of the triode is the control end, the collector is the first end, and the emitter is the second end.
8. The system of any one of claims 1-7, wherein the DC power module and the AC power module each comprise an isolated conversion topology or a non-isolated conversion topology;
the isolated transform topology comprises any one of the following: a Flyback transform topology, a Forward transform topology, a Push-Pull transform topology, a Half-Bridge transform topology;
the non-isolated transformation topology comprises any one of the following: buck conversion topology, Boost conversion topology, Buck-Boost conversion topology and Sepic conversion topology.
9. A method for controlling switching of ac/dc power supply of an inverter, characterized in that, the ac/dc power supply switching control system applied to the inverter of any one of claims 1 to 8 comprises:
collecting an output voltage signal of a direct current power supply module;
when the output voltage signal is a high level signal, converting the output voltage signal into an alternating current power supply turn-off control signal for directly controlling the alternating current power supply module to be turned off;
and when the output voltage signal is a low level signal, converting the output voltage signal into an alternating current power supply switching control signal for directly controlling the alternating current power supply module to supply power.
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