CN213705185U - Control circuit and system for extended power supply - Google Patents
Control circuit and system for extended power supply Download PDFInfo
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- CN213705185U CN213705185U CN202022960788.4U CN202022960788U CN213705185U CN 213705185 U CN213705185 U CN 213705185U CN 202022960788 U CN202022960788 U CN 202022960788U CN 213705185 U CN213705185 U CN 213705185U
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Abstract
The utility model discloses a control circuit and system of extension power supply. Three-phase buses of a front vehicle and a rear vehicle in the circuit are connected with normally open main contacts of the expansion contactor; the first ends of first normally open auxiliary contacts of the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay are connected with the coil anode of the expansion contactor; the negative poles of the coils of the first state feedback relay and the second state feedback relay are both connected with the negative pole of the coil of the extended contactor; the first normally-open auxiliary contact second end and the second normally-open auxiliary contact first end of the first three-phase voltage monitoring relay and the first normally-open auxiliary contact second end and the second normally-open auxiliary contact first end of the second three-phase voltage monitoring relay are connected at one position. Adopt the utility model discloses a circuit and system can reduce the unbalanced three-phase influence to the circuit, improve the reliability of train extension power supply.
Description
Technical Field
The utility model relates to a power supply technical field especially relates to a control circuit and system of extension power supply.
Background
The three-phase power is widely applied to various rail vehicles such as electric locomotives, urban rail vehicles, motor train units and the like. In order to reduce the redundancy of three-phase power supply, grid-connected power supply, cross power supply and extended power supply modes are often adopted among all carriages of the vehicle for power supply.
The existing three-phase voltage high-power load on the rail train is basically only provided with air conditioners and air compressors, and the existing extended power supply circuit can independently configure a three-phase voltage monitoring relay for each air conditioner and each air compressor for detecting a three-phase voltage normal signal of equipment. Meanwhile, the internal electrical equipment and the wiring of the extended power supply device are numerous, fault points are numerous, the conditions of equipment damage, wiring harness misconnection, few lines and the like easily occur, the extended power supply device adopts the mechanical coil to obtain electricity, the attraction is controlled, the extended power supply is realized, the reliability is low, and the cost of phase sequence detection and later-period maintenance and replacement during the initial three-phase electricity application during debugging is increased. In addition, the existing control circuit for extended power supply can only start extended power supply when power is off, and does not monitor the three-phase imbalance or the leakage and phase loss condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a control circuit and system of extension power supply can reduce the unbalanced three-phase and the influence of equipment electric leakage to the circuit, have that the circuit is simple, the fault point is few, the reliability is high, debugging and later stage operation maintenance's advantage with low costs earlier.
In order to achieve the above object, the utility model provides a following scheme:
an extended power supply control circuit comprising:
the system comprises a first three-phase voltage monitoring relay, a second three-phase voltage monitoring relay, a first state feedback relay, a second state feedback relay and an extension contactor;
the normally open main contact of the expansion contactor is respectively connected with a three-phase bus of a front vehicle and a three-phase bus of a rear vehicle;
the coil positive electrode of the expansion contactor is respectively connected with the first end of the first normally-open auxiliary contact of the first three-phase voltage monitoring relay and the first end of the first normally-open auxiliary contact of the second three-phase voltage monitoring relay;
the coil cathode of the expansion contactor is respectively connected with the coil cathode of the first state feedback relay, the coil cathode of the second state feedback relay and the power supply cathode of the train control management system;
the second end of the first normally-open auxiliary contact of the first three-phase voltage monitoring relay is respectively connected with the first end of the second normally-open auxiliary contact of the first three-phase voltage monitoring relay, the second end of the first normally-open auxiliary contact of the second three-phase voltage monitoring relay, the first end of the second normally-open auxiliary contact of the second three-phase voltage monitoring relay and the positive electrode of a power supply of the train control management system;
a second end of a second normally open auxiliary contact of the first three-phase voltage monitoring relay is connected with a positive electrode of a coil of the first state feedback relay; a coil of the first three-phase voltage monitoring relay is connected with a three-phase bus of the front vehicle;
a second end of a second normally open auxiliary contact of the second three-phase voltage monitoring relay is connected with the positive electrode of the coil of the second state feedback relay; a coil of the second three-phase voltage monitoring relay is connected with a three-phase bus of the rear vehicle;
the first end of a normally open auxiliary contact of the first state feedback relay is connected with the load of the front vehicle;
the first end of a normally open auxiliary contact of the second state feedback relay is connected with the load of the rear vehicle;
and the second end of the normally open auxiliary contact of the first state feedback relay and the second end of the normally open auxiliary contact of the second state feedback relay are both connected with the negative electrode of the power supply of the train control management system.
Optionally, the control circuit further includes: a control switch and a standby power supply;
the first end of the control switch is connected with the positive electrode of a power supply of the train control management system; the second end of the control switch is connected with the negative electrode of the power supply of the train control management system; the control switch is used for being closed when the power supply of the train control management system fails;
the positive pole of the standby power supply is connected with the second end of the control switch; the negative electrode of the standby power supply is respectively connected with the coil negative electrode of the first state feedback relay, the coil negative electrode of the second state feedback relay and the coil negative electrode of the expansion contactor; and the standby power supply is used for supplying power to all carriages when the control switch is closed.
Optionally, the supply voltage of the standby power supply is 110V.
Optionally, the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay are both CM-mps.41s in model number.
An extended power supply control system comprising:
a train control management system and the control circuit for expanding power supply;
the train control management system is respectively connected with the positive electrode of the coil of the first state feedback relay, the positive electrode of the coil of the second state feedback relay, the second end of the second normally-open auxiliary contact of the first three-phase voltage monitoring relay and the second end of the second normally-open auxiliary contact of the second three-phase voltage monitoring relay; the train control management system is used for controlling a rear train to supply power for the front train in an extended mode when power supply of the front train is abnormal, or controlling the front train to supply power for the rear train in an extended mode when power supply of the rear train is abnormal.
Optionally, the control system further includes: an auxiliary inverter;
the auxiliary inverter is respectively connected with a three-phase bus of a front train, a three-phase bus of a rear train and the train control management system;
the auxiliary inverter is used for converting direct current into alternating current.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a control circuit and a system for three-phase extended power supply, wherein the circuit comprises a first three-phase voltage monitoring relay, a second three-phase voltage monitoring relay, a first state feedback relay, a second state feedback relay and an extended contactor; when the three-phase electricity of the carriage is normal, coils of the first three-phase voltage monitoring relay, the second three-phase voltage monitoring relay, the first state feedback relay and the second state feedback relay are in an electrified state, normally open auxiliary contacts corresponding to the coils are closed, the coils of the expansion contactor are in short circuit, and normally open main contacts corresponding to the coils are disconnected; when the three-phase electricity of the front vehicle is abnormal, the first three-phase voltage monitoring relay and the coil of the first state feedback relay lose electricity, the normally open auxiliary contact corresponding to the coil is disconnected, the coil of the extended contactor is electrified, the normally open auxiliary contact corresponding to the coil is closed, and the rear vehicle provides the three-phase electricity for the front vehicle; on the contrary, when the back car three-phase electricity is unusual, second three-phase voltage monitoring relay and second state feedback relay coil lose electricity, the normally open auxiliary contact disconnection that the coil corresponds, and the coil of extension contactor gets electric, and the normally open auxiliary contact that the coil corresponds is closed, and the front truck provides the three-phase electricity for the back car. The utility model discloses a set up first three-phase voltage monitoring relay, second three-phase voltage monitoring relay and replace a large amount of relays in the circuit for control circuit can reduce the unbalanced three-phase and the influence of equipment electric leakage to the circuit, has that the circuit is simple, the fault point is few, the reliability is high, debugging and later stage operation maintenance's advantage with low costs in earlier stage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit diagram of a control circuit for extended power supply in an embodiment of the present invention.
Description of the drawings: LVD 1-first three-phase voltage monitoring relay; LVD 2-a second three-phase voltage monitoring relay; KM-extended contactor; k1 — first state feedback relay; k2 — second state feedback relay; SA-control switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a control circuit and system of extension power supply can reduce the unbalanced three-phase and the influence of equipment electric leakage to the circuit, have that the circuit is simple, the fault point is few, the reliability is high, debugging and later stage operation maintenance's advantage with low costs earlier.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Examples
Fig. 1 is a circuit diagram of a control circuit for extended power supply in an embodiment of the present invention. The numbers 11, 12, 13 and 14 marked at the LVD1 respectively represent a first end of a first normally-open auxiliary contact, a second end of the first normally-open auxiliary contact, a first end of a second normally-open auxiliary contact and a second end of the second normally-open auxiliary contact of the first three-phase voltage monitoring relay; marks 11, 12, 13 and 14 at the LVD2 respectively represent a first end of a first normally-open auxiliary contact, a second end of the first normally-open auxiliary contact, a first end of a second normally-open auxiliary contact and a second end of the second normally-open auxiliary contact of the second three-phase voltage monitoring relay; 1-8 marked at KM respectively represent a first normally open main contact first end, a first normally open main contact second end, a second normally open main contact first end, a second normally open main contact second end, a third normally open main contact first end, a third normally open main contact second end, a normally open auxiliary contact first end and a normally open auxiliary contact second end of the extended contactor; 1 and 2 marked at SA control the first and second ends of the switch respectively; u, V, W all represent three-phase buses, wherein U1, V1 and W1 all represent three-phase buses of a front vehicle, and U2, V2 and W2 all represent three-phase buses of a rear vehicle; 11, 13, 15 and 17 marked at K1 all represent the first ends of the normally open auxiliary contacts of the first state feedback relay, and 12, 14, 16 and 18 marked at K1 all represent the second ends of the normally open auxiliary contacts of the first state feedback relay; reference numerals 11, 13, 15, 17 at K2 each represent a first end of a normally open auxiliary contact of the second state feedback relay, and reference numerals 12, 14, 16, 18 at K2 each represent a second end of a normally open auxiliary contact of the second state feedback relay.
As shown in fig. 1, the utility model provides a control circuit of extension power supply, include: the system comprises a first three-phase voltage monitoring relay LVD1, a second three-phase voltage monitoring relay LVD2, a first state feedback relay K1, a second state feedback relay K2 and an expansion contactor KM.
The normally open main contact of the expansion contactor KM is respectively connected with a three-phase bus of a front vehicle and a three-phase bus of a rear vehicle; specifically, a first end of a first normally open main contact, a first end of a second normally open main contact and a first end of a third normally open main contact of the expansion contactor KM are respectively connected with a three-phase bus of a front vehicle; a second end of a first normally open main contact, a second end of a second normally open main contact and a second end of a third normally open main contact of the expansion contactor KM are respectively connected with a three-phase bus of a rear vehicle; the positive electrode of the coil of the expansion contactor KM is respectively connected with the first end of a first normally-open auxiliary contact of the first three-phase voltage monitoring relay LVD1 and the first end of a first normally-open auxiliary contact of the second three-phase voltage monitoring relay LVD 2; and the coil cathode of the expansion contactor KM is respectively connected with the coil cathode of the first state feedback relay K1, the coil cathode of the second state feedback relay K2 and the power supply cathode of the train control management system.
The second end of a first normally-open auxiliary contact of the first three-phase voltage monitoring relay LVD1 is respectively connected with the first end of a second normally-open auxiliary contact of the first three-phase voltage monitoring relay LVD1, the second end of a first normally-open auxiliary contact of the second three-phase voltage monitoring relay LVD2, the first end of a second normally-open auxiliary contact of the second three-phase voltage monitoring relay LVD2 and the positive electrode of a power supply of a train control management system; a second end of a second normally-open auxiliary contact of the first three-phase voltage monitoring relay LVD1 is connected with a positive electrode of a coil of the first state feedback relay K1; a coil of the first three-phase voltage monitoring relay LVD1 is connected with a three-phase bus of a front vehicle; a second end of a second normally-open auxiliary contact of the second three-phase voltage monitoring relay LVD2 is connected with a coil positive electrode of a second state feedback relay K2; and a coil of the second three-phase voltage monitoring relay LVD2 is connected with a three-phase bus of a rear vehicle.
The first end of a normally open auxiliary contact of the first state feedback relay K1 is connected with the load of the front vehicle; the first end of a normally open auxiliary contact of the second state feedback relay K2 is connected with the load of the rear vehicle; and the second end of the normally open auxiliary contact of the first state feedback relay K1 and the second end of the normally open auxiliary contact of the second state feedback relay K2 are both connected with the negative electrode of the power supply of the train control management system.
The utility model provides a control circuit for expanding power supply, which also comprises a control switch SA and a standby power supply; the first end of the control switch SA and the second end of the control switch SA are respectively connected with a power supply (namely TCMS-D0 and a TCMS-power supply in the figure) of the train control management system; (the first end of the control switch SA is connected with the positive pole of the power supply of the train control management system; the second end of the control switch SA is connected with the negative pole of the power supply of the train control management system.) the control switch SA is used for closing when the power supply of the train control management system fails.
The positive electrode of the standby power supply is connected with the second end of the control switch SA; the negative electrode of the standby power supply is respectively connected with the coil negative electrode of the first state feedback relay K1 and the coil negative electrode of the second state feedback relay K2; the standby power supply is used for supplying power to all the carriages when the control switch SA is closed.
Specifically, the supply voltage of the standby power supply is 110V. The models of the first three-phase voltage monitoring relay LVD1 and the second three-phase voltage monitoring relay LVD2 are CM-MPS.41S.
The utility model also provides a control system of extension power supply, include: train control management system and the control circuit of extension power supply.
The train control management system is respectively connected with the coil anode of the first state feedback relay K1, the coil anode of the second state feedback relay K2, the second end of the second normally-open auxiliary contact of the first three-phase voltage monitoring relay LVD1 and the second end of the second normally-open auxiliary contact of the second three-phase voltage monitoring relay LVD 2; the train control management system is used for controlling the rear train to supply power for the front train in an extended mode when the power supply of the front train is abnormal, or controlling the front train to supply power for the rear train in an extended mode when the power supply of the rear train is abnormal.
The utility model provides a control system of extension power supply still includes: an auxiliary inverter; the auxiliary inverter is respectively connected with the three-phase bus of the front vehicle, the three-phase bus of the rear vehicle and the train control management system; the auxiliary inverter is used for converting direct current into alternating current.
Specifically, TCMS-DI1, TCMS-DI2 and TCMS-DI3 in FIG. 1 are signal acquisition points of the train control management system; the normally open auxiliary contact first end of extension contactor is connected with train control management system, and the normally open auxiliary contact second end of extension contactor is connected with the first normally open auxiliary contact second end of first three-phase voltage monitoring relay, the second of first three-phase voltage monitoring relay normally opens auxiliary contact first end, the first normally open auxiliary contact second end of second three-phase voltage monitoring relay, the second of second three-phase voltage monitoring relay normally opens auxiliary contact first end and control switch's first end respectively. The first end of a normally open auxiliary contact of the expansion contactor is used as a signal acquisition point TCMS-DI2, and the train control management system acquires whether the normally open auxiliary contact of the expansion contactor is closed or not; the train control management system collects on-off signals of a first three-phase voltage monitoring relay and a first state feedback relay in TCMS-DI 1; the train control management system collects on-off signals (namely 'normal three-phase voltage' and 'abnormal three-phase voltage') of a second three-phase voltage monitoring relay and a second state feedback relay in TCMS-DI 3. In addition, the train control management system also obtains the power supply condition of the three-phase bus by detecting whether the auxiliary inverter operates.
A power supply of a train control management system is matched with an auxiliary inverter to provide three-phase power for a carriage, a three-phase voltage monitoring relay monitors that a coil is electrified when the three-phase voltage state is normal, and normally open auxiliary contacts of the three-phase voltage monitoring relay are closed; meanwhile, the coil of the corresponding state feedback relay is electrified, the normally open auxiliary contact of the state feedback relay is closed, the train load (an air conditioner, an air compressor and the like) is electrified, at the moment, the coil of the expansion contactor is short-circuited, and the normally open main contact of the expansion contactor is disconnected (namely, a power supply of a train control management system supplies power to a carriage of a front train and a carriage of a rear train respectively); the train control management system collects on-off signals of the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay and judges whether an extended power supply instruction is sent out or not so as to close the extended contactor, and the carriage with normal three-phase voltage power supply supplies power to the adjacent carriage. The three-phase voltage monitoring relay has the functions of three-phase open-phase monitoring, phase sequence monitoring, over-under-voltage monitoring, three-phase unbalance monitoring and the like.
The three-phase voltage monitoring relay is arranged in a railway train carriage, when a three-phase bus of the carriage stops supplying power, a normally closed contact of the three-phase voltage monitoring relay corresponding to the power failure carriage is closed, a normally open auxiliary contact is opened, and at the moment, the carriage stopping three-phase power supply is called as a target expansion power supply carriage.
If the target extended power supply compartment is a front compartment, the train control management system acquires a three-phase voltage abnormal signal of the first three-phase voltage monitoring relay through a signal acquisition point TCMS-DI1, the train control management system sends an extended power supply instruction, the coil of the extended contactor is electrified, a normally open main contact of the extended contactor is closed to connect a three-phase bus of the front compartment and a three-phase bus of the rear compartment, and the rear compartment supplies power for the extended front compartment through the three-phase bus. After the power supply is expanded, the coil of the first three-phase voltage monitoring relay is electrified again, and the normally-open auxiliary contact is closed again; the coil of the first state feedback relay is energized again and the normally open auxiliary contact is closed again. And the train control management system collects the voltage state of the three-phase bus after the extended power supply through a signal collection point TCMS-DI 1.
On the contrary, if the target extended power supply compartment is the rear compartment, the train control management system acquires a three-phase voltage abnormal signal of the second three-phase voltage monitoring relay through the signal acquisition point TCMS-DI3, the train control management system sends an extended power supply instruction, the coil of the extended contactor is electrified, the normally open main contact of the extended contactor is closed to connect the three-phase bus of the front vehicle and the three-phase bus of the rear vehicle, and the front compartment supplies power to the rear compartment through the three-phase bus. After the power supply is expanded, the coil of the second three-phase voltage monitoring relay is electrified again; the normally open auxiliary contact is closed again; the coil of the second state feedback relay is electrified again; the normally open auxiliary contact is closed again. And the train control management system collects the voltage state of the three-phase bus after the extended power supply through a signal collection point TCMS-DI 3.
In addition, when the train control management system breaks down, the power supply of the train control management system can not supply power to the train any more, and at the moment, the control switch is closed, and the front train carriage and the rear train carriage of the train are supplied with power through the standby power supply.
The utility model provides a control circuit and system of extension power supply uses electronic components to replace the mechanical coil of original extension power supply to get the electricity actuation, has improved the reliability of train extension power supply; the three-phase voltage monitoring relay arranged at each load of the train is cancelled, the space utilization rate of the extended power supply device is reduced, the extended power supply circuit is simplified, the fault points of the extended power supply circuit are reduced, and the cost of early debugging and later operation maintenance is reduced;
the utility model discloses use the single-phase load of three-phase load or balanced configuration, use simultaneously and can carry out three-phase and lack looks monitoring, phase sequence supervision, cross the three-phase voltage monitoring relay that undervoltage and unbalanced three-phase were kept watch on, reduced the influence that unbalanced three-phase and equipment electric leakage caused the train power supply.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. Meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present description should not be construed as a limitation of the present invention.
Claims (6)
1. An extended power supply control circuit, the control circuit comprising:
the system comprises a first three-phase voltage monitoring relay, a second three-phase voltage monitoring relay, a first state feedback relay, a second state feedback relay and an extension contactor;
the normally open main contact of the expansion contactor is respectively connected with a three-phase bus of a front vehicle and a three-phase bus of a rear vehicle;
the coil positive electrode of the expansion contactor is respectively connected with the first end of the first normally-open auxiliary contact of the first three-phase voltage monitoring relay and the first end of the first normally-open auxiliary contact of the second three-phase voltage monitoring relay;
the coil cathode of the expansion contactor is respectively connected with the coil cathode of the first state feedback relay, the coil cathode of the second state feedback relay and the power supply cathode of the train control management system;
the second end of the first normally-open auxiliary contact of the first three-phase voltage monitoring relay is respectively connected with the first end of the second normally-open auxiliary contact of the first three-phase voltage monitoring relay, the second end of the first normally-open auxiliary contact of the second three-phase voltage monitoring relay, the first end of the second normally-open auxiliary contact of the second three-phase voltage monitoring relay and the positive electrode of a power supply of the train control management system;
a second end of a second normally open auxiliary contact of the first three-phase voltage monitoring relay is connected with a positive electrode of a coil of the first state feedback relay; a coil of the first three-phase voltage monitoring relay is connected with a three-phase bus of the front vehicle;
a second end of a second normally open auxiliary contact of the second three-phase voltage monitoring relay is connected with the positive electrode of the coil of the second state feedback relay; a coil of the second three-phase voltage monitoring relay is connected with a three-phase bus of the rear vehicle;
the first end of a normally open auxiliary contact of the first state feedback relay is connected with the load of the front vehicle;
the first end of a normally open auxiliary contact of the second state feedback relay is connected with the load of the rear vehicle;
and the second end of the normally open auxiliary contact of the first state feedback relay and the second end of the normally open auxiliary contact of the second state feedback relay are both connected with the negative electrode of the power supply of the train control management system.
2. The extended power supply control circuit of claim 1, further comprising: a control switch and a standby power supply;
the first end of the control switch is connected with the positive electrode of a power supply of the train control management system; the second end of the control switch is connected with the negative electrode of the power supply of the train control management system; the control switch is used for being closed when the train control management system has a fault;
the positive pole of the standby power supply is connected with the second end of the control switch; the negative electrode of the standby power supply is respectively connected with the coil negative electrode of the first state feedback relay, the coil negative electrode of the second state feedback relay and the coil negative electrode of the expansion contactor; and the standby power supply is used for supplying power to all carriages when the control switch is closed.
3. The extended power supply control circuit of claim 2, wherein the supply voltage of the backup power supply is 110V.
4. The extended power supply control circuit of claim 1, wherein the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay are each of a model number CM-mps.41s.
5. An extended power supply control system, the control system comprising:
a train control management system and an extended power control circuit as claimed in any one of claims 1 to 4;
the train control management system is respectively connected with the positive electrode of the coil of the first state feedback relay, the positive electrode of the coil of the second state feedback relay, the second end of the second normally-open auxiliary contact of the first three-phase voltage monitoring relay and the second end of the second normally-open auxiliary contact of the second three-phase voltage monitoring relay; the train control management system is used for controlling a rear train to supply power for the front train in an extended mode when power supply of the front train is abnormal, or controlling the front train to supply power for the rear train in an extended mode when power supply of the rear train is abnormal.
6. The extended power supply control system of claim 5, further comprising: an auxiliary inverter;
the auxiliary inverter is respectively connected with a three-phase bus of a front train, a three-phase bus of a rear train and the train control management system;
the auxiliary inverter is used for converting direct current into alternating current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022960788.4U CN213705185U (en) | 2020-12-09 | 2020-12-09 | Control circuit and system for extended power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022960788.4U CN213705185U (en) | 2020-12-09 | 2020-12-09 | Control circuit and system for extended power supply |
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| CN213705185U true CN213705185U (en) | 2021-07-16 |
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| CN202022960788.4U Active CN213705185U (en) | 2020-12-09 | 2020-12-09 | Control circuit and system for extended power supply |
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