CN112202315A - Power supply system for stepped power-up - Google Patents

Power supply system for stepped power-up Download PDF

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Publication number
CN112202315A
CN112202315A CN202010901905.1A CN202010901905A CN112202315A CN 112202315 A CN112202315 A CN 112202315A CN 202010901905 A CN202010901905 A CN 202010901905A CN 112202315 A CN112202315 A CN 112202315A
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China
Prior art keywords
power supply
alternating current
circuit
power
contactor
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Granted
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CN202010901905.1A
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Chinese (zh)
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CN112202315B (en
Inventor
路宇
龚健
王磊
张彦
毕磊
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Yangzhou Institute Of Marine Electronic Instruments No723 Institute Of China Shipbuilding Industry Corp
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Yangzhou Institute Of Marine Electronic Instruments No723 Institute Of China Shipbuilding Industry Corp
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Priority to CN202010901905.1A priority Critical patent/CN112202315B/en
Publication of CN112202315A publication Critical patent/CN112202315A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a power supply system for stepped power-up, which mainly comprises a normally closed alternating current contactor, a normally open alternating current contactor, an AC/DC auxiliary circuit, an AC/DC main circuit and an isolation diode. After normal power supply, the normally closed alternating current contactor controls the AC/DC auxiliary circuit to start preferentially, and power-up is carried out on the environmental control equipment and the like in advance. After reasonable time delay, the normally open alternating current contactor controls the AC/DC main circuit to start, and power is supplied to the main electric equipment. And after the output of the AC/DC main circuit is stable, the AC/DC auxiliary circuit is controlled to be closed, and only the main circuit is left to work. The AC/DC auxiliary circuit only works at the initial stage of power-on, so that the problem of extra power consumption caused by continuous work of the auxiliary circuit is completely solved, and the reliability of a power supply is greatly improved. In addition, only the AC/DC main circuit is left to work after the power supply is started, so that current harmonics can be effectively reduced only by adding a PFC circuit into the main circuit, the power factor of the whole power supply is improved, and the cost is saved while the performance of the power supply is improved.

Description

Power supply system for stepped power-up
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a power supply system for stepped power-up.
Background
At present, in a large-scale industrial, domestic and medical electric system, some environmental control equipment is usually added to monitor and control the system environment. The environment control device needs to implement functions of state monitoring, control protection, fault warning and the like on the system environment before the main body electric equipment is powered on, so that the environment control device needs to be powered on preferentially, that is, the power supply system is required to have a function of power on in a grading manner. To achieve step power up, the power supply system is generally designed according to the principle shown in fig. 1. As can be seen from fig. 1, the power supply system is divided into two parts, one part is a main circuit for supplying power to the main electric device. The other part is an auxiliary circuit used for supplying power to the environmental control equipment or the control circuit. The auxiliary circuit is started prior to the main circuit, so that timing control needs to be added inside the circuit. The power supply system shown in fig. 1 has the advantages of simple structure and clear principle, but the disadvantages are also obvious: firstly, the power supply directly obtains input electricity from a three-phase alternating current power grid, more harmonic components can be generated, the utilization rate of electric equipment is reduced, the power factor is reduced, harmonic components can cause harmonic pollution to the power grid, and serious electromagnetic interference is generated; and secondly, the auxiliary power supply needs to work all the time, so that not only is the power consumption additionally increased, but also the power failure of the environment control equipment is caused once the fault occurs, and the normal operation of the whole power supply system is further caused.
In response to the first disadvantage, a commonly adopted measure is to use Power Factor Correction (PFC) technology to make the input current approximate a sine wave to meet the requirement of harmonic suppression. For the power supply system shown in fig. 1, if only the PFC circuit is added to the main circuit, the power factor correction effect will be greatly reduced due to the presence of the auxiliary circuit, and if the PFC circuit is added to both the main circuit and the auxiliary circuit (as shown in fig. 2), the circuit cost will be greatly increased. For the second disadvantage, one auxiliary power supply is usually added as a backup (as shown in fig. 2), and when one of the auxiliary power supplies fails, the other auxiliary power supply is automatically connected to work to ensure the normal work of the auxiliary circuit, however, the problem of extra power consumption still cannot be solved, and the circuit cost is correspondingly increased.
In summary, the drawbacks of the prior art solutions are mainly reflected by:
(1) the power supply system powered up in a grading mode has the problems that the Power Factor (PF) is low, the current harmonic THDi is high, the conduction emission test requirement of the equipment electromagnetic compatibility CE101 cannot be met, and the like. If the harmonic waves are improved and the electromagnetic interference is reduced, a PFC circuit needs to be added to a main circuit and an auxiliary circuit at the same time, and the circuit cost is greatly increased.
(2) The auxiliary circuit needs to work all the time after the power supply is started, so that not only is the power consumption additionally increased, but also the whole power supply system cannot normally run once the auxiliary circuit is damaged. If a backup circuit is added, the reliability of the auxiliary circuit can only be slightly improved, the problem of power consumption increase cannot be solved, and meanwhile, the cost is increased.
Disclosure of Invention
In view of the above, the present invention provides a power supply system for step power up.
The technical solution for realizing the purpose of the invention is as follows: a power supply system for step power up, comprising:
the normally closed alternating current contactor is used for controlling the on-off of alternating current power supply, the control signal is in a closed state when being low, and the control signal is in a closed state when being high;
the normally open alternating current contactor is used for controlling the on-off of alternating current power supply, the control signal is in a turn-off state when being low, and the control signal is in a turn-on state when being high;
the AC/DC auxiliary circuit is used for carrying out AC/DC and DC/DC conversion on input alternating current power supply and providing a control signal of the normally open alternating current contactor and a power supply voltage of the environment control equipment at the circuit starting stage;
the AC/DC main circuit is used for carrying out AC/DC and DC/DC conversion on input alternating current power supply and providing a control signal of the normally closed alternating current contactor and direct current bus power supply required by main electric equipment; after the AC/DC auxiliary circuit stops working, the AC/DC main circuit replaces the AC/DC auxiliary circuit to provide a control signal of a normally open AC contactor and a power supply voltage of the environment-controlled equipment;
the isolation diode is used for conducting the output of the AC/DC auxiliary circuit in a single direction;
an isolation diode for unidirectionally conducting the output of the AC/DC main circuit
The invention also provides a using method of the power supply system for stepped power up, which comprises the following steps:
step 1: and (3) closing the normally closed alternating current contactor, and transmitting the alternating current to the power supply end of the AC/DC auxiliary circuit through the normally closed alternating current contactor:
step 2: the AC/DC auxiliary circuit works and outputs direct current;
and step 3: the environmental control device 51 operates;
step 4; the output of the AC/DC auxiliary circuit is transmitted to the control end of the normally open AC contactor after being delayed;
and 5: the normally open alternating current contactor is closed, and alternating current is transmitted to the power supply end of the AC/DC main circuit through the normally open alternating current contactor;
step 6: the AC/DC main circuit works and outputs high-power-factor direct current;
and 7: the main electric equipment works;
and 8: the output of the AC/DC main circuit is transmitted to the control end of the normally closed AC contactor;
and step 9: the normally closed alternating current contactor is controlled to be disconnected;
step 10: the AC/DC auxiliary circuit stops operating.
Compared with the prior art, the invention has the following remarkable advantages:
(1) the auxiliary circuit only works at the initial stage of power-on without continuous work, so that the problems of extra power consumption and extra current harmonic wave caused by continuous work of the auxiliary circuit in the power supply are thoroughly solved, and the performance and the reliability of the power supply are greatly improved; meanwhile, the auxiliary circuit does not work continuously, so that a PFC circuit is not required to be added, and the circuit cost is saved;
(2) three single-phase isolation PFC modules are adopted in a main circuit, a power factor correction function is realized by preceding-stage AC/DC conversion, the power factor PF is high (more than 0.99), the current harmonic THDI is low (within 5%), and the requirements of an electromagnetic compatibility CE101 conducted emission test are completely met;
(3) when the three single-phase isolation power factor correction modules work, if one path fails, the other two paths can still supply power to the power utilization equipment, the circuit has a redundancy characteristic, and the reliability of the circuit is further improved.
Drawings
Fig. 1 is a schematic block diagram of a conventional power supply system having a step-up power function.
Fig. 2 is a functional block diagram of an improved power supply system.
Fig. 3 is a schematic block diagram of a power supply system for stepped power up according to the present invention.
Fig. 4 is a flowchart illustrating the power system start-up operation of the present invention.
The system comprises a normally closed alternating current contactor 1, a normally open alternating current contactor 2, an auxiliary circuit 3-AC/DC, a main circuit 4-AC/DC, single-phase PFC circuits 41-43, a DC/DC conversion circuit 44-V1-V2-isolation diodes, a power utilization system 5, an environment control device 51 and a main power utilization device 52.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
A power supply system for step power-up, as shown in FIG. 3, includes a normally closed AC contactor 1, a normally open AC contactor 2, an AC/DC auxiliary circuit 3, an AC/DC main circuit 4, and a power consuming system 5. The input end of the normally closed alternating current contactor 1 is connected with an alternating current input, the output end of the normally closed alternating current contactor 1 is connected with the input end of an AC/DC auxiliary circuit 3, and the output end of the AC/DC auxiliary circuit 3 is connected with the anode of a first isolation diode V1; the input end of the normally open alternating current contactor 2 is connected with an alternating current input, the output end of the normally open alternating current contactor 2 is connected with the input end of the AC/DC main circuit 4, and the output end of the AC/DC main circuit 4 is connected with the anode of the second isolating diode V2, the control end of the normally closed alternating current contactor 1 and the power supply input end of the power utilization system 5; the cathode of the first isolation diode V1 is connected with the cathode of the second isolation diode V2, the control end of the normally open AC contactor 2 and the power supply input end of the power utilization system 5.
The normally closed alternating current contactor 1 is used for controlling the on-off of alternating current power supply of the AC/DC auxiliary circuit 3; the control signal is in a closed state when being low, and is in an off state when being high;
the normally open alternating current contactor 2 is used for controlling the on-off of alternating current power supply of the AC/DC main circuit 4; the control signal is in a turn-off state when being low, and is in a turn-on state when being high;
the AC/DC auxiliary circuit 3 can carry out AC/DC and DC/DC conversion on input alternating current power supply, and the function of the AC/DC auxiliary circuit is mainly to provide a control signal 1 of a normally open alternating current contactor 2 and supply power to a ring control device 51 in an electric system 5 in the circuit starting stage;
the main AC/DC circuit 4 mainly functions to provide a control signal 2 of the normally closed AC contactor 1 and a DC bus power supply required by the main electric device 52. Meanwhile, after the AC/DC auxiliary circuit 3 stops working, the AC/DC main circuit 4 will provide the control signal 1 and the power supply of the environmental control device 51 instead of the AC/DC auxiliary circuit 3.
An isolation diode V1 for unidirectionally conducting the output of the AC/DC auxiliary circuit 3;
and an isolation diode V2 for conducting the output of the AC/DC main circuit 4 in one direction.
In a further embodiment, the AC/DC main circuit 4 comprises three single-phase PFC circuits 41-43 and a DC/DC conversion circuit 44. The front-stage single-phase PFC circuits 41-43 realize a power factor correction function, and the rear-stage DC/DC conversion circuit 44 realizes isolated voltage reduction to obtain a direct-current bus voltage required by main electric equipment 52 in the electric system 5.
The invention uses a normally closed AC contactor and a normally open AC contactor for control. After normal power supply, the normally closed AC contactor controls the auxiliary circuit to be started preferentially, and power-up is performed on the environmental control equipment and the like in advance. After reasonable time delay, the normally open alternating current contactor controls the main circuit to start, the auxiliary circuit is controlled to close after the output of the main circuit is stable, and only the main circuit is left to work. The auxiliary circuit only works at the initial stage of power-on, so that the problem of extra power consumption caused by continuous work of the auxiliary circuit is completely solved, and the reliability of the power supply is greatly improved. In addition, only the main circuit is left to work after the power supply is started, so that current harmonics can be effectively reduced only by adding the PFC circuit into the main circuit, the power factor of the whole power supply is improved, the performance of the power supply is improved, and meanwhile, the cost is saved.
The working process and principle of the invention are as follows:
after the three-phase alternating current of the power grid is normally input, the control signal 1 and the control signal 2 are both low level at the moment, so that the normally closed alternating current contactor 1 is in a closed state, and the normally open alternating current contactor 2 is in an open state. The AC power can be supplied to the input terminal of the AC/DC auxiliary circuit 3 only through the normally closed AC contactor 1.
After rectification and filtering, the AC/DC auxiliary circuit 3 finally outputs a direct current to the anode of the first isolation diode V1, at this time, the diode V1 is in forward conduction, the direct current can reach the cathode through the diode V1, a part of the output direct current is used as a power supply input for preferentially starting the environmental control device 51 in the power system 5, and the other part is used as a control signal 1 and is sent to the control end of the normally-open AC contactor 2 after reasonable time delay.
After the normally open alternating current contactor 2 receives the control signal 1, the normally open alternating current contactor is switched from the off state to the on state, at the moment, three-phase alternating current can be transmitted to power supply input ends of three single-phase PFC circuits 41-43 in the AC/DC main circuit 4 through the normally open alternating current contactor 2, the three single-phase PFC circuits 41-43 start working to output high-power-factor direct current, level conversion is achieved through the DC/DC conversion circuit 44, and finally high-power-factor direct current bus voltage is output to be used for supplying power to main body electric equipment 52 in the electric system 5. In addition, the output of the AC/DC main circuit 4 is transmitted as the control signal 2 to the control terminal of the normally closed AC contactor 1 and the anode of the diode V2.
After receiving the control signal 2, the normally closed AC contactor 1 switches from the closed state to the open state, and at this time, the AC/DC auxiliary circuit 3 is disconnected from the AC power supply, and stops working. And the output of the AC/DC main circuit 4 can continue to provide the control signal 1 and the power supply of the environmental control device 51 through the diode V2, so that the AC/DC main circuit 4 can still maintain the normal power supply of the whole power system 5. The circuit design can realize the wait-free switching of the power supply of the control signal and the environmental control equipment, and greatly improves the reliability and continuity of the power supply.
After the whole power supply is normally started, the power supply of the environmental control equipment 51 is provided by the output of the AC/DC main circuit 4, and an additional auxiliary power supply is not needed, so that the problems of additional power consumption and additional current harmonics caused by the continuous work of the auxiliary circuit in the power supply are thoroughly solved, and the performance and the reliability of the power supply are greatly improved. Meanwhile, the auxiliary circuit does not work continuously, so that a PFC circuit does not need to be added into the auxiliary circuit, and the circuit cost is saved.
In addition, three single-phase PFC circuits in the AC/DC main circuit 4 are used in parallel, if one single-phase PFC circuit fails, the rest PFC circuits can still normally supply power to the subsequent equipment, the circuit has a redundancy characteristic, and the reliability of the circuit is further improved.
A method of using a power supply system for stepped power up, comprising the steps of:
step 1: the normally closed alternating current contactor 1 is closed, and alternating current is transmitted to a power supply end of the AC/DC auxiliary circuit 3 through the normally closed alternating current contactor 1:
step 2: the AC/DC auxiliary circuit 3 works to output direct current;
and step 3: the environmental control device 51 operates;
step 4; the output of the AC/DC auxiliary circuit 3 is transmitted to the control end of the normally open AC contactor 2 after being delayed;
and 5: the normally open alternating current contactor 2 is closed, and alternating current is transmitted to the power supply end of the AC/DC main circuit 4 through the normally open alternating current contactor 2;
step 6: the AC/DC main circuit 4 works and outputs high-power-factor direct current;
and 7: the main body electric equipment 52 operates;
and 8: the output of the AC/DC main circuit 4 is transmitted to the control end of the normally closed AC contactor 1;
and step 9: the normally closed AC contactor 1 is controlled to be disconnected;
step 10: AC/DC auxiliary circuit 3 stops working
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A power supply system for stepped power up, comprising:
the normally closed alternating current contactor (1) is used for controlling the on-off of alternating current power supply, the control signal is in a closed state when being low, and the control signal is in a closed state when being high;
the normally open alternating current contactor (2) is used for controlling the on-off of alternating current power supply, the control signal is in a turn-off state when being low, and the control signal is in a close state when being high;
the AC/DC auxiliary circuit (3) is used for carrying out AC/DC and DC/DC conversion on input alternating current power supply and providing a control signal of the normally open alternating current contactor (2) and a power supply voltage of the environment control equipment (51) in a circuit starting stage;
an AC/DC main circuit (4) for performing AC/DC and DC/DC conversion on input AC power supply, and providing a control signal of the normally closed AC contactor (1) and DC bus power supply required by the main body electric equipment (52); after the AC/DC auxiliary circuit (3) stops working, the AC/DC main circuit (4) replaces the AC/DC auxiliary circuit (3) to provide a control signal of the normally open AC contactor (2) and a power supply voltage of the environment control equipment (51);
an isolation diode (V1) for conducting the output of the AC/DC auxiliary circuit (3) in a single direction;
and an isolation diode (V2) for conducting the output of the AC/DC main circuit (4) in a single direction.
2. The power supply system for stepped power-up according to claim 1, wherein the AC/DC main circuit (4) comprises three single-phase isolated power factor correction circuits (41-43) connected in parallel and a post-DC/DC conversion circuit (44) connected to the output of the single-phase isolated power factor correction circuits (41-43), the three single-phase isolated power factor correction circuits (41-43) being configured to implement a power factor correction function, the post-DC/DC conversion circuit (44) being configured to implement an isolated step-down to obtain a DC bus voltage.
3. A method of using a power supply system for stepped power up, comprising the steps of:
step 1: the normally closed alternating current contactor (1) is closed, and alternating current is transmitted to the power supply end of the AC/DC auxiliary circuit (3) through the normally closed alternating current contactor (1):
step 2: the AC/DC auxiliary circuit (3) works to output direct current;
and step 3: the environmental control device 51 operates;
step 4; the output of the AC/DC auxiliary circuit (3) is transmitted to the control end of the normally open AC contactor (2) after being delayed;
and 5: the normally open alternating current contactor (2) is closed, and alternating current is transmitted to the power supply end of the AC/DC main circuit (4) through the normally open alternating current contactor (2);
step 6: the AC/DC main circuit (4) works and outputs high-power-factor direct current;
and 7: the main body electric equipment (52) works;
and 8: the output of the AC/DC main circuit (4) is transmitted to the control end of the normally closed AC contactor (1);
and step 9: the normally closed alternating current contactor (1) is controlled to be disconnected;
step 10: the AC/DC auxiliary circuit (3) stops operating.
CN202010901905.1A 2020-09-01 2020-09-01 Power supply system for stepped power-up Active CN112202315B (en)

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Application Number Priority Date Filing Date Title
CN202010901905.1A CN112202315B (en) 2020-09-01 2020-09-01 Power supply system for stepped power-up

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CN112202315B CN112202315B (en) 2022-08-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113644556A (en) * 2021-07-12 2021-11-12 中国船舶重工集团公司第七二三研究所 But block terminal of remote control area auxiliary power source

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101383555A (en) * 2008-10-07 2009-03-11 江南大学 Single-phase inversion synthesizing three-phase high power factor converting power source
CN101577487A (en) * 2008-08-26 2009-11-11 江苏中凌高科技有限公司 Capacitor-decoupling three-phase active power factor corrector
CN207074883U (en) * 2017-05-26 2018-03-06 西安特锐德智能充电科技有限公司 A kind of auxiliary source power supply circuit of Portable direct-current input equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101577487A (en) * 2008-08-26 2009-11-11 江苏中凌高科技有限公司 Capacitor-decoupling three-phase active power factor corrector
CN101383555A (en) * 2008-10-07 2009-03-11 江南大学 Single-phase inversion synthesizing three-phase high power factor converting power source
CN207074883U (en) * 2017-05-26 2018-03-06 西安特锐德智能充电科技有限公司 A kind of auxiliary source power supply circuit of Portable direct-current input equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113644556A (en) * 2021-07-12 2021-11-12 中国船舶重工集团公司第七二三研究所 But block terminal of remote control area auxiliary power source
CN113644556B (en) * 2021-07-12 2023-08-22 中国船舶重工集团公司第七二三研究所 But remote control takes auxiliary power supply's block terminal

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