CN108551206B - Switching device and method for power supply module to supply power by using alternating current and direct current power sources - Google Patents
Switching device and method for power supply module to supply power by using alternating current and direct current power sources Download PDFInfo
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- CN108551206B CN108551206B CN201810579885.3A CN201810579885A CN108551206B CN 108551206 B CN108551206 B CN 108551206B CN 201810579885 A CN201810579885 A CN 201810579885A CN 108551206 B CN108551206 B CN 108551206B
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- 238000007599 discharging Methods 0.000 claims description 7
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- 238000011084 recovery Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 6
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention relates to a power supply using device and a power supply using method. The technical proposal is as follows: the power module uses a switching device of alternating current and direct current power supply, and is characterized in that; the device comprises a direct current power-taking connector, a switching controller and a switching switch which are electrically connected in sequence; the direct current power taking connector is a plug conforming to the national standard of the electric automobile charging connector; the change-over switch comprises a first switch, a first switch opening and closing operation mechanism, a second switch and a second switch opening and closing operation mechanism; the switching controller consists of a logic control module, a CAN communication module, an electricity taking connection state measuring module, an electronic lock control module, a voltage and current acquisition module, a switching-on and switching-off driving module, a display module, a key module, an alternating current incoming call detection module and a power supply module. The device and the method do not need DC/AC inversion equipment, and the communication machine room power supply module can safely, stably and reliably switch when using alternating current power supply input or direct current power supply input.
Description
Technical Field
The invention relates to a power supply using device and a power supply using method, in particular to a switching device and a switching method for supplying power by using alternating current and direct current power supplies for a power supply module of a communication machine room.
Background
In general, the communication equipment in the telecommunication room is powered by converting single-phase or three-phase alternating current mains supply into direct current 48V power supply through a power supply module; the power module generally comprises a bridge rectifier (AC/DC) circuit and a direct current/direct current voltage conversion (DC/DC) circuit, wherein the bridge rectifier (AC/DC) circuit is composed of 4 diodes, and the AC/DC circuit of the power module rectifies alternating current commercial power into high-voltage direct current with a peak value of about 300V, and then converts the high-voltage direct current into a 48V direct current power through the direct current/direct current conversion circuit (DC/DC) of the power module. In order to ensure uninterrupted power supply of the communication equipment when the mains supply is interrupted, a storage battery pack is generally connected in parallel with a 48V direct current power supply bus, and the power supply module also provides charging current for the storage battery pack when the mains supply is available; in a telecommunications closet, when three-phase ac power is used, the inputs of a plurality of power modules are typically distributed as evenly as possible over the phases in order to balance the three-phase load.
When the commercial power is interrupted and the energy of the storage battery is discharged, in order to ensure that the power supply of the communication equipment is not interrupted, the conventional method is to use an oil engine generator set to generate alternating current so as to continue the power supply; the other method is to utilize the surplus energy of the high-voltage direct current of the power battery of the electric automobile, and convert the direct current electric energy of the power battery of the electric automobile into single-phase or three-phase alternating current power supply to continuously supply power to the communication equipment through the DC/AC inverter.
When the high-voltage direct-current electric energy of the electric automobile is supplied to the communication equipment through the DC/AC inverter according to the existing method, the loss in the DC/AC inversion conversion process is larger, so that the overall power supply efficiency is lower; meanwhile, the high-power DC/AC inverter equipment is large in volume and heavy in weight; the high-power DC/AC inverter has more electronic components, particularly power electronic components, and the stability and reliability of the inverter are affected to a certain extent; meanwhile, the price of the high-power DC/AC inverter equipment is also quite high.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the device and the method do not need DC/AC inverter equipment, and can safely, stably and reliably switch when the communication machine room power supply module uses alternating current power supply input or direct current power supply input; the purpose of emergency power supply for the communication machine room power module by utilizing the electric energy of the electric automobile power battery is achieved.
The technical scheme provided by the invention is as follows:
the power module uses a switching device of alternating current and direct current power supply, and is characterized in that; the device comprises a direct current power-taking connector, a switching controller and a switching switch which are electrically connected in sequence;
the direct current power taking connector is a plug conforming to the national standard of the electric automobile charging connector;
the change-over switch comprises a first switch, a first switch opening and closing operation mechanism, a second switch and a second switch opening and closing operation mechanism;
the switching controller consists of a logic control module, a CAN communication module, an electricity taking connection state measuring module, an electronic lock control module, a voltage and current acquisition module, an opening and closing driving module, a display module, a key module, an alternating current incoming call detection module and a power supply module; the 8 groups of input and output ports of the logic control module in the switching controller are respectively connected with signal ends of the CAN communication module, the electricity taking connection state measuring module, the electronic lock control module, the opening and closing driving module, the display module, the key module, the voltage and current acquisition module and the alternating current incoming call detection module; the power supply circuit in the switching controller provides auxiliary working power supply for the electric automobile through the auxiliary power line and the direct current power taking connector, and also provides working power supply for each module circuit of the switching controller.
The input end of a first switch of the change-over switch is connected with single-phase or three-phase four-wire alternating current commercial power, the input end of a second switch of the change-over switch is connected with the direct current electric energy output of the electric automobile through a voltage and current acquisition module and a high-voltage direct current connecting wire in the change-over controller and a direct current power-taking connector, and the power module of a communication machine room is connected after the first switch output of the change-over switch is connected with the homonymous end of the second switch output; the switching controller is connected with the direct current power taking connector through connecting wires such as a CAN communication wire, a direct current power taking connector connecting state wire, an electronic lock control wire, an electronic lock feedback wire, an auxiliary power wire and the like; the switching controller is also electrically connected with the first switch opening and closing operation mechanism and the second switch opening and closing operation mechanism of the switching switch through opening and closing operation connecting lines respectively so as to control the opening (closing) and the closing (breaking) of the first switch and the second switch of the switching switch.
The 2 input ends of the change-over switch are respectively connected with an alternating current power supply and a direct current power supply, and a load connected with the output of the change-over switch is a communication machine room power supply module which can be powered by the alternating current power supply or the direct current power supply.
The power supply module uses the switching method of the alternating current power supply and the direct current power supply, and sequentially comprises the following steps:
1) The direct-current electric energy of the power battery of the electric automobile bypasses the DC/AC inversion equipment and is connected into the power module of the communication machine room after passing through the change-over switch;
2) And when the direct current flowing through the contact of the second switch is smaller or even no current flows through the contact of the second switch, the switching-on and switching-off operation is carried out.
When the power supply module is required to be switched from alternating current power supply to direct current power supply, a first switch of the switching switch is in a closing state, a second switch of the switching switch is in a separating state, and the switching device is switched according to the following steps:
1) Inserting a direct current power taking connector into a direct current discharge interface of the electric automobile;
2) Operating a DC power supply key of a key module of a switching controller, wherein the switching controller is connected by taking power
The connection state measuring module confirms that the direct-current power taking connector is inserted into the direct-current of the electric automobile through the connection state wire
After the electric interface is fetched in place;
3) The switching controller locks the electronic lock in the direct current power-taking connector through the electronic lock control module through the electronic lock connecting wire;
4) The switching controller is communicated with the electric automobile through a CAN communication module through a CAN connection and a direct current electricity taking connector, and inquires the nominal voltage value, the current voltage value and the residual capacity of the power battery of the electric automobile;
5) When the current voltage value of the power battery of the electric automobile accords with the input direct-current voltage range of the power module of the communication machine room and the residual capacity of the power battery of the electric automobile is allowed to discharge, the switching controller informs a first switch switching-on/off operation mechanism of the switching switch to perform switching-on operation on the first switch through the switching-on/off driving module and the first switching-on/off connecting wire;
6) After the first switch of the change-over switch is opened, the change-over controller informs a second switch opening and closing operation mechanism of the change-over switch to perform closing operation on the second switch through an opening and closing driving module and a second opening and closing connecting line;
7) After the second switch of the change-over switch is switched on and the change-over controller confirms that the electronic lock in the direct-current power taking connector is locked through the electronic lock feedback line, the change-over controller informs the electric automobile of outputting high-voltage direct-current electric energy through the CAN communication module through the CAN connection line.
8) And switching from alternating current power supply to direct current power supply of the power supply module of the communication machine room is completed.
And in the period that the electric automobile outputs high-voltage direct current electric energy to supply power to the communication machine room power module through the switching device, the switching controller is in timing communication with the electric automobile through the CAN communication module, so that the continuous output of the high-voltage direct current electric energy of the electric automobile is ensured.
When the power supply module is required to be switched from direct current power supply to alternating current power supply, a first switch of the change-over switch is in a switching-off state, a second switch is in a switching-on state, and the change-over device is switched according to the following steps:
1) Operating an AC power supply key of a key module of the switching controller;
2) The switching controller communicates with the electric automobile through a CAN communication module through a CAN connection line to inform the electric automobile of stopping outputting high-voltage direct-current electric energy;
3) The switching controller confirms that the electric automobile stops outputting high-voltage direct current through the voltage and current acquisition module, and when the voltage and current of the high-voltage direct current are lower than the operation safety value, the switching controller informs a second switch switching-on and switching-off operation mechanism of the switching switch to perform switching-on operation on the second switch through the switching-on and switching-off driving module and the second switching-on and switching-off connecting line;
4) After the second switch is opened, the switching controller unlocks the electronic lock in the direct-current power-taking connector through the electronic lock connecting line by the electronic lock control module;
5) After the switching controller confirms that the electronic lock in the direct-current power taking connector is unlocked through the electronic lock feedback line, the display module displays that the direct-current power taking connector can be removed from the direct-current discharging interface of the electric automobile;
6) After the power taking connection state measuring module of the switching controller confirms that the direct current power taking connector is removed from the direct current discharging interface of the electric automobile through the connection state connecting wire, the switching-on/off driving module and the first switching-on/off connecting wire inform a first switch switching-on/off operating mechanism of the switching switch to perform switching-on operation on the first switch;
7) And the switching of the direct-current power supply of the power supply module of the communication machine room into alternating-current power supply is completed.
The invention is provided with an alternating current incoming call detection module besides the working mode that the power supply module of the manual operation communication machine room is switched from alternating current power supply to direct current power supply or from direct current power supply to alternating current power supply; when the alternating current power supply interrupts the communication machine room power supply module and is supplied by the direct current power supply, the automatic recovery working mode of the alternating current power supply can be automatically switched to after the switching controller detects that the alternating current power supply is recovered.
When the working mode is automatically restored, after the alternating current power supply interrupts the power supply module of the communication machine room and is supplied by the direct current power supply, the first switch of the change-over switch is in a switching-off state, and the second switch is in a switching-on state; when the switching controller detects that the alternating current power supply is recovered, the switching device switches according to the following steps:
1) After the switching controller detects that the alternating current power supply is recovered through the alternating current incoming call detection module;
2) The switching controller communicates with the electric automobile through a CAN communication module through a CAN connection line to inform the electric automobile of stopping outputting high-voltage direct-current electric energy;
3) The switching controller confirms that the electric automobile stops outputting high-voltage direct current through the voltage and current acquisition module, and when the voltage and current of the high-voltage direct current are lower than the operation safety value, the switching controller informs a second switch switching-on and switching-off operation mechanism of the switching switch to perform switching-on operation on the second switch through the switching-on and switching-off driving module and the second switching-on and switching-off connecting line;
4) After the second switch is opened, the switching controller unlocks the electronic lock in the direct current power-taking connector through the electronic lock control module through a connecting wire;
5) After the switching controller confirms that the electronic lock in the direct-current power taking connector is unlocked through the electronic lock feedback line, the display module displays that the direct-current power taking connector can be removed from the direct-current discharging interface of the electric automobile;
6) After the second switch is opened, the opening and closing driving module and the first opening and closing connecting line inform the first switch opening and closing operating mechanism of the change-over switch to perform closing operation on the first switch;
7) And the switching of automatically changing the direct-current power supply of the power supply module of the communication machine room into alternating-current power supply is completed.
According to the steps, the alternating current power supply of the power supply module of the communication machine room is changed into direct current power supply and the direct current power supply is changed into alternating current power supply, and the contacts of the second switch of the switching-on/switching-off high-voltage direct current are switched off or closed when no current or small current exists, so that the arc for breaking or closing the contacts is greatly reduced.
When the switching device of the alternating current power supply and the direct current power supply performs the power supply switching operation, the display module of the switching controller displays the state of the switching process in real time or prompts the next operation.
The beneficial effects of the invention are as follows:
the invention fully utilizes the existing power supply module of the communication machine room, does not need DC/AC inversion, supplies power to the power supply module of the communication machine room after the direct-current power of the power battery of the electric automobile passes through the alternating-current/direct-current power supply switching device, and has the characteristics of high overall equipment efficiency, small volume, light weight, low cost, convenient use and good reliability and stability. Compared with the emergency power supply of the communication equipment by using the oil engine generator set, the emergency power supply of the communication equipment is realized by using the abundant energy of the power battery of the electric automobile, and the emergency power supply device has the advantages of good mobility, low cost, no pollution, no disturbance to people and the like.
According to the switching method for supplying power to the alternating current direct current power supply, the current is small or even no current at the breaking and closing moments of the contacts of the second switch connected with the high-voltage direct current power supply, the voltage between the contacts of the switch is low during breaking, the defect that the common switch is difficult to break high-current high-voltage direct current arc extinction is overcome, and the breaking capacity requirement of the second switch connected with the high-voltage direct current power supply is reduced.
Drawings
Fig. 1 is a schematic diagram of a power switching device according to the present invention.
Fig. 2 is a schematic diagram of a switching controller in the power switching device.
Fig. 3 is a schematic diagram of a telecommunications room power module.
Fig. 4 is a schematic diagram of a logic control module in the switching controller.
Fig. 5 is a schematic diagram of a CAN communication module in the switching controller.
Fig. 6 is a schematic diagram of the power connection status measurement module in the switching controller.
Fig. 7 is a schematic diagram of an electronic lock control module in the switching controller.
Fig. 8 is a schematic diagram of a voltage and current acquisition module in the switching controller.
Fig. 9 is a schematic diagram of an opening and closing driving module in the switching controller.
Fig. 10 is a schematic diagram of a display module in the switching controller.
Fig. 11 is a schematic diagram of a key module in the switching controller.
Fig. 12 is a schematic diagram of a power supply circuit in the switching controller.
Fig. 13 is a schematic diagram of an ac incoming call detection module in the switching controller.
Detailed Description
The embodiments are further described below with reference to the accompanying drawings.
Referring to the schematic diagram of the power supply module in fig. 3, diodes (D1-D4) in fig. 3 form a bridge rectifier AC/DC circuit, when an input (ain_ A, ACIN _n) is connected with a 220V AC power supply, the AC power supply becomes a DC power supply with a peak value of about 300V after passing through the bridge rectifier circuit and a filter capacitor (C), and about 300V DC is converted into a 48V DC power supply output (dc_out-, dc_out+); if a direct current power supply of about 300V is connected between the inputs (ACIN_ A, ACIN _N) of the power supply module of the telecommunication room, the rectifier diodes (D1, D2, D3 and D4) in the AC/DC circuit are always 2 forward conduction and 2 reverse cut-off, and the two ends of the filter capacitor (C) in the power supply module of the telecommunication room are also about 300V direct current, so that the alternating current input end of the power supply module of the telecommunication room with the bridge rectifier circuit at the input end can be supplied with the direct current power supply, and the power supply module of the telecommunication room can work normally as long as the voltage value of the input direct current power supply is within the working voltage range of the DC/DC circuit of the power supply module of the telecommunication room.
The invention aims to provide a switching device for supplying power to a communication machine room power module by using an alternating current power supply and a direct current power supply. In the prior art, there are two-way power supply switching devices with two-way ac power supply inputs and two-way dc power supply inputs, but there is no two-way power supply switching device with mixed input of ac power supply and dc power supply, and because the two-way power supply switching device with one-way ac power supply and one-way dc power supply has special requirements, the following description is made:
in this embodiment, the original telecommunication room is taken as an example that 3 power modules are all provided, and ac inputs of the 3 power modules are respectively connected to A, B, C phases of three-phase mains supply, and a specific embodiment of the present invention is described with reference to the accompanying drawings.
Referring to fig. 1, the alternating current/direct current power supply input switching device of the invention consists of a direct current power taking connector (1), a switching controller (2) and a switching switch (3); the direct current electricity taking connector is a plug which accords with the national standard of a direct current charging interface of a connecting device for electric vehicle conduction charging, and consists of a power contact and high-voltage direct current connecting line (HV_L1 and HV_L2), a CAN communication contact and connecting line (S+, S-), an auxiliary power contact and auxiliary power connecting line (A+, A-), an electronic lock and electronic lock control line (EL), an electronic lock feedback line (K), a direct current electricity taking connector connecting state line (CC 1 and CC 2) and the like. The switching switch 3 consists of a first switch (K1) and a first switch opening and closing operating mechanism (3-1), a second switch (K2) and a second switch opening and closing operating mechanism (3-2), wherein the input end (ACIN_ A, ACIN _ B, ACIN _ C, ACIN _N) of the first switch of the switching switch is connected with single-phase or three-phase four-wire alternating current mains supply, and the input end (DCIN_ A, DCIN _B) of the second switch of the switching switch is connected with the direct current power output of the electric automobile through a voltage and current acquisition module (2-5), high-voltage direct current connecting wires (HV_L1 and HV_L2) in the switching controller (2) and then through a direct current power taking connector (1); the first switch output of the change-over switch is connected with the second switch output identical-name end (OUT_ A, OUT _ B, OUT _ C, OUT _N) and then is communicated with the power supply module of the communication machine room; the switching controller is respectively connected with the direct-current power taking connector through connecting lines such as CAN communication lines (S+, S-) and direct-current power taking connector connecting state lines (CC 1 and CC 2), an electronic lock control line (EL), an electronic lock feedback line (K), an auxiliary power supply connecting line (A+, A-) and the like, and is also respectively electrically connected with a first switch opening and closing operating mechanism (3-1) and a second switch opening and closing operating mechanism (3-2) of the switching switch through opening and closing operating connecting lines (FHZ 1_ +, FHZ1_ -, FHZ2_ +, FHZ2_ -) so as to control the opening (closing) and the opening (breaking) of the first switch and the second switch of the switching switch.
The 2 input ends of the change-over switch (namely the input end of the first switch of the change-over switch and the input end of the second switch of the change-over switch) are respectively connected with an alternating current power supply and a direct current power supply, and the load connected with the output of the change-over switch is a communication machine room power supply module which can be powered by the alternating current power supply or the direct current power supply.
When the communication machine room has 3 power supply modules, the inputs of the power supply modules are respectively connected with the power supply outputs OUT_ A, OUT _N, OUT_ B, OUT _N and OUT_ C, OUT _N of the change-over switch, and when the communication machine room has a plurality of power supply modules, the load is equally distributed in three alternating-current phases as much as possible.
Referring to fig. 2, the switching controller (2) is composed of a logic control module (2-1), a CAN communication module (2-2), an electricity taking connection state measuring module (2-3), an electronic lock control module (2-4), a voltage and current acquisition module (2-5), a switching on/off driving module (2-6), a display module (2-7), a key module (2-8), an alternating current incoming call detection module (2-10) and a power supply circuit (2-9), wherein 8 groups of input and output ports (IO_1, IO_2, IO_3, IO_4, IO_5, IO_6, IO_7 and IO_8) of the logic control module (2-1) of the switching controller are respectively connected with signal ends of the CAN communication module, the electricity taking connection state measuring module, the electronic lock control module, the switching on/off driving module, the display module, the key module, the voltage and current acquisition module, and the power supply circuit in the switching controller provides auxiliary working power for an electric automobile through an auxiliary power supply connection wire (a+, a-) via a direct current electricity taking connector, and the power supply circuit also provides working power supply for each module of the switching controller.
Referring to fig. 4 in combination with fig. 2, a logic control module (2-1) in the switching controller (2) consists of a single-chip microprocessor (1 IC 1) and a quartz crystal (JT 1); the two pins of the quartz crystal (JT 1) are respectively connected with the crystal oscillator input and output ends (OSCIN, OSCOUT) of the single-chip microprocessor 1IC1, the working power source+, the working power source- (VDD, VSS) of the single-chip microprocessor 1IC1 are respectively connected with +5V and the public ground, the 8 groups of input and output ports (I/O_1, I/O_2, I/O_3, I/O_4, I/O_5, I/O_6, I/O_7, I/O_8) of the single-chip microprocessor (1 IC 1) are respectively connected with the signal ends of the CAN communication module, the electricity taking connection state measuring module, the electronic lock control module, the switch-on/off driving module, the display module, the key module, the voltage and current acquisition module and the alternating current incoming call detection module, and the model of the single-chip microprocessor (1 IC 1) is STM8, and other single-chip microprocessors with AD functions CAN be used.
Referring to fig. 5 in combination with fig. 2, a CAN communication module (2-2) in a switching controller (2) is composed of a CAN transceiver chip (2 IC 1) and a termination resistor (2R 1); the circuit ends (CANH, CANL) of the CAN transceiver chip 2IC1 are connected to corresponding contacts of the direct current power-taking connector through CAN connection lines (S+, S-) and the data receiving and transmitting ends (TX, RX) of the CAN transceiver chip 2IC1 are connected to the digital ports of the logic control module 2-1 through connection lines (I/O_1-1, I/O_1-2), the terminal resistor (2R 1) is connected in parallel with the circuit ends CANH, CANL of the CAN transceiver chip 2IC1, the model of the CAN transceiver chip (2 IC 1) is TD301DCANH3, and other CAN transceiver chips with isolation functions CAN be used.
Referring to fig. 6 in combination with fig. 2, the power-taking connection state measurement module 2-3 in the switching controller (2) is composed of a CC1 voltage division circuit composed of resistors (3R 1, 3R2 and 3R 3) and a CC2 current division circuit composed of resistors (3R 4), a +12V power supply is connected with one end of the resistor 3R1, the other end of the resistor 3R1 is grounded to a common ground wire through 3R2 and 3R3, a connection point of the 3R1 and the 3R2 is connected with a CC1 contact of the direct current power-taking connector through a connection state wire CC1, a connection point of the 3R2 and the 3R3 is connected with an AD input wire of the logic control module 2-1 through an I/O_2 wire, and the logic control module 2-1 judges whether a plug of the power-taking connector is completely inserted into a socket of the power-taking connector according to the voltage change of the end of the CC1 and judges the state of the electronic lock; one end of the resistor (3R 4) is connected to a CC2 contact of the direct current access electric connector through a connection state wire (CC 2), the other end of the resistor (3R 4) is connected with the public ground, after a plug of the access electric connector is inserted into a socket of the access electric connector, a part of current of a CC2 loop is shunted by the resistor 3R4, the voltage between the CC2 and the public ground changes, and the electric automobile judges whether the plug of the access electric connector is completely inserted into the socket of the access electric connector according to the voltage change between the CC2 and the public ground.
Referring to fig. 7 in combination with fig. 2, an electronic lock control module 2-4 in the switching controller (2) is composed of a switching circuit composed of triodes (4 BG1, 4BG 2) and resistors (4R 1, 4R 2) and a voltage dividing circuit composed of resistors (4R 3, 4R4, 4R 5); the emitter of the triode 4BG1 is connected with a power supply +12V, the collector of the triode 4BG1 is connected with an electronic lock control line (EL), the base of the triode 4BG1 is connected with the collector of the triode 4BG2 through a resistor 4R1, the emitter of the triode 4BG2 is connected with the public ground, and the base of the triode 4BG2 is connected with a digital output port of the logic control module 2-1 through a resistor 4R2 and an I/O_3-1; one end of the resistor 4R3 is connected with a +12V power supply, the other end of the resistor 4R3 is grounded to a common ground wire through the resistor 4R4 and the resistor 4R5, a connection point of the resistor 4R3 and the resistor 4R4 is connected to a K contact point of the power taking connector through an electronic lock feedback line K, and a connection point of the resistor 4R4 and the resistor 4R5 is connected to a digital input port of the logic control module 2-1 through an I/O_3-2 line.
The electronic lock in the direct current power taking connector is a mechanical device formed by electromagnets, a logic control module 2-1 in the switching controller outputs high and low level through an I/O_3-1 to control the on or off of the electromagnets, and the logic control module 2-1 judges whether the electronic lock in the power taking connector (1) is locked or not according to the level change of a feedback line (K) of the state of the electronic lock.
Referring to fig. 8 in combination with fig. 2 and fig. 1, the voltage and current acquisition module 2-5 of the high-voltage direct current in the switching controller (2) is composed of a voltage dividing circuit composed of resistors (5R 1, 5R 2), a current sampling resistor (5R 3), an operational amplifier (5 IC 1) and a current signal amplifying circuit composed of resistors (5R 4, 5R5, 5R 6); the input of the voltage dividing circuit consisting of the resistor 5R1 and the resistor 5R2 is connected between high-voltage direct current inputs (HV_L1 and HV_L2), the connection point of the 5R1 and the 5R2 is the AD input port line of the logic control module 2-1 through a connecting line (I/O_7-1), the current sampling resistor (5R 3) is connected between the HV_L2 and the DCIN_B in series, a current signal sampled by the resistor 5R3 is connected with the non-inverting end input of the operational amplifier 5IC1 through the resistor (5R 6), the output of the operational amplifier 5IC1 is connected with the other AD input port line of the logic control module 2-1 through the connecting line (I/O_7-2), and the voltage of the I/O_7-2 line can be known through the analog-to-digital conversion I/O_7-1 of the logic control module 2.
Referring to fig. 9 in combination with fig. 2, the switching driving module 2-6 in the switching controller (2) is composed of relays (6J 1, 6J2, 6J3, 6J 4), triodes (6 BG1, 6BG2, 6BG3, 6BG 4), resistors (6R 1, 6R2, 6R3, 6R 4), the collector of the triode 6BG1 is connected with one end of a coil of the relay 6J1, the other end of the coil of the 6J1 is connected with a power supply 12v+, the base of the 6BG1 is connected to an output port line of the logic control module 2-1 through a resistor 6R1 and an I/o_4_1, an emitter of the triode 6BG1 is grounded, and the 6J1_a is a contact of the relay 6J 1;
the collector of the triode 6BG2 is connected with one end of a coil of the relay 6J2, the other end of the coil of the relay 6J2 is connected with a power supply 12V+, the base of the relay 6BG2 is connected to an output port line of the logic control module 2-1 through a resistor 6R2 and an I/O_4_2, the emitter of the triode 6BG2 is grounded to a common ground wire, and the 6J2_A and the 6J2_B are 2 pairs of conversion contacts of the relay 6J 2;
the collector of the triode 6BG3 is connected with one end of a coil of the relay 6J3, the other end of the coil of the relay 6J3 is connected with a power supply 12V+, the base of the triode 6BG3 is connected to an output port line of the logic control module 2-1 through a resistor 6R3 and an I/O_4_3, the emitter of the triode 6BG3 is grounded to a common ground wire, and the contact of the relay 6J3 is 6J 3_A;
the collector of the triode 6BG4 is connected with one end of a coil of the relay 6J4, the other end of the coil of the relay 6J4 is connected with a power supply 12V+, the base of the triode 6BG4 is connected to an output port line of the logic control module 2-1 through a resistor 6R4 and an I/O_4_4, the emitter of the triode 6BG4 is grounded to a common ground wire, and the 6J4_A and the 6J4_B are 2 pairs of conversion contacts of the relay 6J 4;
the switching-on/off driving modules 2-6 are connected according to the electrical schematic diagram of fig. 9:
when the output port line I/O_4_1 of the logic control module 2-1 is at a high level and the output port line I/O_4_2 is at a low level, the relay 6J1 is in attraction, the output FHZ1_ + of the opening and closing driving module 2-6 is 12V+, FHZ1_ -is the common ground, and the first switch opening and closing operating mechanism 3-1 executes closing operation;
when the output port line I/O_4_1 of the logic control module 2-1 is at a high level and the I/O_4_2 is also at a high level, the relays 6J1 and 6J2 are both in suction, the output FHZ1_ + of the opening and closing driving module 2-6 is a common ground, FHZ1_ -is 12V+, and the first switch opening and closing operating mechanism 3-1 executes opening and closing operation;
when the output port line I/O_4_3 of the logic control module 2-1 is at a high level and the I/O_4_4 is at a low level, the relay 6J3 is in attraction, the output FHZ2_ + of the opening and closing driving module 2-6 is 12V+, FHZ2_ -is the common ground, and the second switch opening and closing operating mechanism 3-2 executes closing operation;
when the output line I/o_4_3 of the logic control module 2-1 is at a high level and the I/o_4_4 is also at a high level, the relays 6J3 and 6J4 are both closed, the output FHZ2 _2+ of the opening/closing driving module 2-6 is common ground, FHZ 2_12 v+, and the second switch opening/closing operating mechanism 3-2 performs an opening/closing operation.
Referring to fig. 10 in combination with fig. 2, the display module (2-7) in the switching controller (2) is composed of a general liquid crystal display screen (7 YJ 1) with driving function, the power supply terminals (VDD, VSS) of the liquid crystal display screen (7 YJ 1) are connected with the power supply +5v and the public ground, the data receiving and transmitting terminals (RX, TX) of the liquid crystal display screen (7 YJ 1) are connected with the data input and output port lines of the logic control module 2-1 through the wires (I/o_5-1, I/o_5-2), and the type of the liquid crystal display screen is TJC4024T032, or other liquid crystal display screens with driving function can be adopted.
Referring to fig. 11 in combination with fig. 2, the key module (2-8) in the switching controller (2) is composed of 4 keys (8K 1, 8K2, 8K3, 8K 4) and 4 pull-up resistors (8R 1, 8R2, 8R3, 8R 4) to form function keys such as "AC power supply", "DC power supply", "selection", "confirmation", etc.; one end of the resistor 8R1, 8R2, 8R3 and 8R4 is connected with a power supply +5V, the other end of the resistor 8R1, 8R2, 8R3 and 8R4 is connected with one end of the key 8K1, 8K2, 8K3 and 8K4 respectively, the other end of the key 8K1, 8K2, 8K3 and 8K4 is connected with a common ground wire, the connection parts of the resistor 8R1, 8R2, 8R3 and 8R4 and the key 8K1, 8K2, 8K3 and 8K4 are connected to 4 digital input ports of the logic control module 2-1 of the switching controller through I/O_6-1, I/O_6-2, I/O_6-3 and I/O_6-4 wires, the I/O_6-2, I/O_6-3 and I/O_6-4 wires are high in normal times, when the key is pressed, the corresponding wires are low in level, and more selective functions of the wires can be added when the key is pressed.
Referring to fig. 13 in combination with fig. 2, the ac incoming call detection module (2-10) in the switching controller (2) is composed of 3 rectifying diodes (10D 1, 10D2, 10D 3), 3 current limiting resistors (10R 1, 10R2, 10R 3), 3 photocouplers (10 GD1, 10GD2, 10GD 3) and 3 pull-up resistors (10R 4, 10R5, 10R 6).
In fig. 13, the positive electrode of the rectifying diode 10D1 is a connection line (L1), the negative electrode of the rectifying diode 10D1 is connected to the connection line (N) through a current limiting resistor 10R1, the positive electrode of the photoelectric coupler 10GD1 and the negative electrode of the photoelectric coupler 10GD1, the emitter of the photoelectric coupler 10GD1 is grounded in common, the collector of the photoelectric coupler 10GD1 is connected to the digital input port of the logic control module 2-1 of the switching controller through a connection line I/o_8-1, one end of the pull-up resistor 10R4 is connected to +5v, and the other end of the pull-up resistor 10R4 is connected to the collector of the photoelectric coupler 10GD 1;
in fig. 13, the positive electrode of the rectifying diode 10D2 is a connection line (L2), the negative electrode of the rectifying diode 10D2 is connected with the connection line (N) through a current limiting resistor 10R2, the positive electrode of the photoelectric coupler 10GD2 and the negative electrode of the photoelectric coupler 10GD2, the emitter of the photoelectric coupler 10GD2 is grounded in common, the collector of the photoelectric coupler 10GD2 is connected to the digital input port of the logic control module 2-1 of the switching controller through a connection line I/o_8-2, one end of the pull-up resistor 10R5 is connected with +5v, and the other end of the pull-up resistor 10R5 is connected with the collector of the photoelectric coupler 10GD 2;
in fig. 13, the positive electrode of the rectifying diode 10D3 is a connection line (L3), the negative electrode of the rectifying diode 10D3 is connected with the connection line (N) through a current limiting resistor 10R3, the positive electrode of the photoelectric coupler 10GD3 and the negative electrode of the photoelectric coupler 10GD3, the emitter of the photoelectric coupler 10GD3 is grounded in common, the collector of the photoelectric coupler 10GD3 is connected to the digital input port of the logic control module 2-1 of the switching controller through a connection line I/o_8-3, one end of the pull-up resistor 10R6 is connected with +5v, and the other end of the pull-up resistor 10R6 is connected with the collector of the photoelectric coupler 10GD 3;
the input ends (L1, L2, L3) of the ac incoming call detection module of fig. 13 are respectively connected with the phases A, B, C of the three-phase ac power supply, when the three-phase ac power supply is input, the collectors and emitters of the photocouplers 10GD1, 10GD2, 10GD3 are alternately conducted, the connection lines I/o_8-1, I/o_8-2, I/o_8-3 respectively present the high and low level of 50HZ, and the logic control module 2-1 of the switching controller knows the interruption and recovery of the power supply of the three-phase ac power supply according to the level change of the ports connected with the I/o_8-1, I/o_8-2, I/o_8-3.
Referring to fig. 12 IN combination with fig. 2, a power supply circuit 2-9 IN the switching controller (2) is composed of a battery pack (BATT), a power switch (9K 1) and voltage stabilizing integrated circuits (9 IC1, 9IC2, 9IC 3), wherein the output + pole of the battery pack is connected to the Input (IN) end of each voltage stabilizing integrated circuit after passing through the power switch, the Output (OUT) of the voltage stabilizing integrated circuit 9IC1 is connected to a direct current power taking connector through an auxiliary power supply connection line a + and a-to provide auxiliary working power for an electric automobile, and the Output (OUT) of the 9IC2 and the Output (OUT) of the 9IC3 provide +5v and +12v working power for each circuit of the alternating current-direct current power supply switching device.
The first switch K1 and the second switch K2 in the change-over switch are conventional switches with a mechanical interlocking function and used for controlling closing and opening of an electric signal, and can be a circuit breaker, a combined switch, a high-power magnetic latching relay or a magnetic latching contactor; the opening and closing operation mechanisms of the first switch K1 and the second switch K2 can be existing operation mechanisms such as a motor and an electromagnet which can rotate bidirectionally, and the opening and closing driving module circuit is correspondingly adjusted according to different opening and closing operation mechanisms.
If the communication equipment of the telecommunication room is powered by single-phase alternating current mains, the switch of the invention can adopt a first switch K1 and a second switch K2 with 2 sets of contacts.
In order to facilitate connection with the power battery of the electric automobile, after the electric automobile is added with the function and the communication protocol that the power battery supplies power to the outside through the direct current charging interface, the direct current power taking connector can take power from the direct current charging interface of the electric automobile, and the electric automobile does not need to be additionally provided with a power battery discharging connecting seat.
Claims (9)
1. The power module uses the switching device of alternating current and direct current power supply, characterized by that; the device comprises a direct current power taking connector (1), a switching controller (2) and a switching switch (3) which are electrically connected in sequence;
the direct current power taking connector is a plug conforming to the national standard of the electric automobile charging connector;
the change-over switch comprises a first switch (K1) and a first switch opening and closing operating mechanism (3-1), a second switch (K2) and a second switch opening and closing operating mechanism (3-2);
the switching controller consists of a logic control module (2-1), a CAN communication module (2-2), an electricity taking connection state measuring module (2-3), an electronic lock control module (2-4), a voltage and current acquisition module (2-5), a switching-on and switching-off driving module (2-6), a display module (2-7), a key module (2-8), an alternating current incoming call detection module (2-10) and a power module (2-9); the 8 groups of input and output ports (IO_1, IO_2, IO_3, IO_4, IO_5, IO_6, IO_7 and IO_8) of the logic control module in the switching controller are respectively connected with signal ends of the CAN communication module, the electricity taking connection state measuring module, the electronic lock control module, the opening and closing driving module, the display module, the key module, the voltage and current acquisition module and the alternating current incoming call detection module; the power supply circuit in the switching controller provides auxiliary working power supply for the electric automobile through the direct current power taking connector by an auxiliary power supply connecting wire (A+, A-) and also provides working power supply for each module circuit of the switching controller;
the input end (ACIN_ A, ACIN _ B, ACIN _ C, ACIN _N) of a first switch of the switch is connected with single-phase or three-phase four-wire alternating current mains supply, and the input end (DCIN_ A, DCIN _B) of a second switch of the switch is connected with the direct current electric energy output of the electric automobile through a voltage and current acquisition module and high-voltage direct current connecting wires (HV_L1 and HV_L2) in a switch controller and a direct current power taking connector; the first switch output of the change-over switch is connected with the second switch output identical-name end (OUT_ A, OUT _ B, OUT _ C, OUT _N) and then is communicated with the power supply module of the communication machine room; the switching controller is connected with the direct current power taking connector through a CAN communication line, direct current power taking connector connection state lines (CC 1 and CC 2), an electronic lock control line (EL), an electronic lock feedback line (K) and an auxiliary power supply connection line respectively; the switching controller is also electrically connected with a first switch opening and closing operation mechanism and a second switch opening and closing operation mechanism of the switching switch through opening and closing operation connecting lines (FHZ & lt 1 & gt1 & lt+ & gt, FHZ & lt 1 & gt1 & gtand FHZ & lt 2 & gtand FHZ & lt 2 & gtto control the opening and closing of the first switch and the second switch of the switching switch.
2. The switching device for power supply of claim 1, wherein the power supply module is powered by ac and dc power supplies, and wherein: the 2 input ends of the change-over switch are respectively connected with an alternating current power supply and a direct current power supply, and a load connected with the output of the change-over switch is a communication machine room power supply module which can be powered by the alternating current power supply or the direct current power supply.
3. The switching method of the switching device for power supply of the power module according to claim 1, comprising the following steps in order:
1) The direct-current electric energy of the power battery of the electric automobile bypasses the DC/AC inversion equipment and is connected into the power module of the communication machine room after passing through the change-over switch;
2) And when the direct current flowing through the contact of the second switch is smaller or even no current flows through the contact of the second switch, the switching-on and switching-off operation is carried out.
4. A switching method of a switching device for power supply of a power module using ac and dc power according to claim 3, wherein: when the communication machine room power supply module is required to be switched from alternating current power supply to direct current power supply, a first switch of the switching switch is in a closing state, a second switch of the switching switch is in a separating state, and the switching device is switched according to the following steps:
1) Inserting a direct current power taking connector into a direct current discharge interface of the electric automobile;
2) Operating the "DC power" key of the key module (2-8) of the switching controller, the switching controller is on
The over-power-taking connection state measuring module confirms that the direct-current power-taking connector is inserted into the direct-current power-taking interface of the electric automobile through connection state wires (CC 1 and CC 2) and is in place;
3) The switching controller locks the electronic lock in the direct current power-taking connector through an electronic lock connecting wire (EL) through the electronic lock control module;
4) The switching controller is communicated with the electric automobile through a CAN communication module, a CAN connection (S+, S-) and a direct current power taking connector, and inquires about the nominal voltage value, the current voltage value and the residual capacity of the power battery of the electric automobile;
5) When the current voltage value of the power battery of the electric automobile accords with the input direct-current voltage range of the power module of the communication machine room and the residual capacity of the power battery of the electric automobile is allowed to discharge, the switching controller informs a first switch opening and closing operation mechanism of the switching switch to perform opening operation on the first switch through an opening and closing driving module and a first opening and closing connecting wire (FHZ 1_ +, FHZ1_ -);
6) After the first switch of the change-over switch is separated, the change-over controller informs a second switch opening and closing operation mechanism of the change-over switch to perform closing operation on the second switch through opening and closing driving modules and second opening and closing connecting lines (FHZ 2_ +, FHZ2_ -);
7) After the second switch of the change-over switch is switched on and the change-over controller confirms that the electronic lock in the direct-current power taking connector is locked through the electronic lock feedback line, the change-over controller informs the electric automobile of outputting high-voltage direct-current electric energy through the CAN communication module through the CAN connection line;
8) And switching from alternating current power supply to direct current power supply of the power supply module of the communication machine room is completed.
5. The switching method of the switching device for power supply of the power module using ac and dc power according to claim 4, wherein: and in the period that the electric automobile outputs high-voltage direct current electric energy to supply power to the communication machine room power module through the switching device, the switching controller is in timing communication with the electric automobile through the CAN communication module, so that the continuous output of the high-voltage direct current electric energy of the electric automobile is ensured.
6. The switching method of the switching device for power supply of the power module using ac and dc power according to claim 5, wherein: when the communication machine room power supply module is required to be switched from direct current power supply to alternating current power supply, a first switch of the change-over switch is in a switching-off state, a second switch is in a switching-on state, and the change-over device is switched according to the following steps:
1) Operating an AC power supply key of a key module of the switching controller;
2) The switching controller communicates with the electric automobile through a CAN communication module through a CAN connection line to inform the electric automobile of stopping outputting high-voltage direct-current electric energy;
3) The switching controller confirms that the electric automobile stops outputting high-voltage direct current through the voltage and current acquisition module, and when the voltage and current of the high-voltage direct current are lower than the operation safety value, the switching controller informs a second switch switching-on and switching-off operation mechanism of the switching switch to perform switching-on operation on the second switch through the switching-on and switching-off driving module and the second switching-on and switching-off connecting line;
4) After the second switch is opened, the switching controller unlocks the electronic lock in the direct-current power-taking connector through the electronic lock connecting line by the electronic lock control module;
5) After the switching controller confirms that the electronic lock in the direct-current power taking connector is unlocked through the electronic lock feedback line, the display module displays that the direct-current power taking connector can be removed from the direct-current discharging interface of the electric automobile;
6) After the power taking connection state measuring module of the switching controller confirms that the direct current power taking connector is removed from the direct current discharging interface of the electric automobile through the connection state connecting wire, the switching-on/off driving module and the first switching-on/off connecting wire inform a first switch switching-on/off operating mechanism of the switching switch to perform switching-on operation on the first switch;
7) And the switching of the direct-current power supply of the power supply module of the communication machine room into alternating-current power supply is completed.
7. The switching method of a switching device for power supply of a power module using ac and dc power according to claim 5 or 6, wherein: the automatic power supply switching device is also provided with an alternating current incoming call detection module, and when the alternating current power supply interrupts the power supply module of the communication machine room and is supplied by the direct current power supply, the automatic power supply switching device can automatically switch to an automatic recovery working mode of the alternating current power supply after detecting that the alternating current power supply is recovered by the switching controller.
8. The switching method of a switching device for power supply of a power module using ac and dc power according to claim 7, wherein: when the automatic work mode is restored, after the alternating current power supply interrupts the power supply module of the communication machine room and is supplied by the direct current power supply, the first switch of the change-over switch is in a switching-off state, the second switch is in a switching-on state, and when the change-over controller detects that the alternating current power supply is restored, the change-over device is switched according to the following steps:
1) After the switching controller detects that the alternating current power supply is recovered through the alternating current incoming call detection module;
2) The switching controller communicates with the electric automobile through a CAN communication module through a CAN connection line to inform the electric automobile of stopping outputting high-voltage direct-current electric energy;
3) The switching controller confirms that the electric automobile stops outputting high-voltage direct current through the voltage and current acquisition module, and when the voltage and current of the high-voltage direct current are lower than the operation safety value, the switching controller informs a second switch switching-on and switching-off operation mechanism of the switching switch to perform switching-on operation on the second switch through the switching-on and switching-off driving module and the second switching-on and switching-off connecting line;
4) After the second switch is opened, the switching controller unlocks the electronic lock in the direct current power-taking connector through the electronic lock control module through a connecting wire;
5) After the switching controller confirms that the electronic lock in the direct-current power taking connector is unlocked through the electronic lock feedback line, the display module displays that the direct-current power taking connector can be removed from the direct-current discharging interface of the electric automobile;
6) After the second switch is opened, the opening and closing driving module and the first opening and closing connecting line inform the first switch opening and closing operating mechanism of the change-over switch to perform closing operation on the first switch;
7) And the switching of automatically changing the direct-current power supply of the power supply module of the communication machine room into alternating-current power supply is completed.
9. The switching method of a switching device for power supply of a power module using ac and dc power according to claim 8, wherein: when the switching device of the alternating current power supply and the direct current power supply performs the power supply switching operation, the display module of the switching controller displays the state of the switching process in real time or prompts the next operation.
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| CN201810579885.3A CN108551206B (en) | 2018-06-07 | 2018-06-07 | Switching device and method for power supply module to supply power by using alternating current and direct current power sources |
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