CN214480314U - Power supply device of direct current motor control center - Google Patents

Abstract

The utility model discloses a power supply unit at direct current motor control center, include: the power supply comprises a first power supply module, a second power supply module and a third power supply module; the input ends of the three power supply modules are electrically connected with an alternating current power supply; the output end of the first power supply module is electrically connected with the power supply loop and used for converting an alternating current signal of an alternating current power supply into a first direct current signal and outputting the first direct current signal to the power supply loop; the output end of the second power supply module is electrically connected with the control loop and used for converting the alternating current signal into a second direct current signal and outputting the second direct current signal to the control loop; the output end of the third power supply module is electrically connected with the power supply signal input end of the overload relay and used for converting the alternating current signal into a third direct current signal and outputting the third direct current signal to the overload relay; the first direct current signal, the second direct current signal and the third direct current signal have different voltage values. The utility model provides a technical scheme can provide the power for direct current motor control center, raises the efficiency, reduces danger.

Description

Power supply device of direct current motor control center

Technical Field

The utility model relates to a power technical field especially relates to a DC motor control center's power supply unit.

Background

In the third generation nuclear power represented by the AP series (Advanced Passive PWR), a large number of nuclear-grade electric valves controlled by direct current motors are adopted, and power supply devices of the nuclear-grade electric valves are direct current motor control centers. The direct current motor control center comprises a power supply loop, two control loops and a motor overload protection device, the circuit design is complex, and the direct current motor control center needs to be specially debugged before normal work. For debugging of a direct current motor control center, a worker needs to use direct current power supplies with different voltage levels to respectively supply power to a power supply loop, a control loop and an overload relay of a motor overload protection device, and due to the fact that wiring is complex, wiring errors can exist, the problem that power utilization parts are damaged is caused, working efficiency is affected, and dangerousness exists.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a power supply unit at direct current motor control center can provide the power for direct current motor control center, raises the efficiency, reduces danger.

The embodiment of the utility model provides a power supply unit of direct current motor control center, direct current motor control center includes power return circuit, control circuit and overload relay, direct current motor control center's power supply unit includes first power module, second power module and third power module;

the input end of the first power supply module, the input end of the second power supply module and the input end of the third power supply module are all electrically connected with an alternating current power supply;

the output end of the first power supply module is electrically connected with the power supply loop; the first power supply module is used for converting an alternating current signal of the alternating current power supply into a first direct current signal and outputting the first direct current signal to the power supply loop;

the output end of the second power supply module is electrically connected with the control loop; the second power supply module is used for converting the alternating current signal into a second direct current signal and outputting the second direct current signal to the control loop;

the output end of the third power supply module is electrically connected with the power supply signal input end of the overload relay; the third power supply module is used for converting the alternating current signal into a third direct current signal and outputting the third direct current signal to the overload relay;

wherein voltage values of the first direct current signal, the second direct current signal and the third direct current signal are different from each other.

Optionally, the output end of the first power supply module is further electrically connected with the working signal input end of the overload relay; the first power supply module is also used for providing working voltage for the overload relay.

Optionally, the power supply device of the dc motor control center further includes: a time relay; the time relay and the third power supply module are connected in parallel to a power supply signal input end of the overload relay; and the time relay is used for displaying the time required by the overload relay for overload protection.

Optionally, the first power module includes a first conversion circuit, a first rectification circuit and a first voltage divider circuit, which are electrically connected between the ac power supply and the power supply loop in sequence; the first conversion circuit is used for converting the alternating current signal into a first alternating current signal; the first rectifying circuit is used for rectifying the first alternating current signal, dividing the voltage by the first voltage dividing circuit and converting the voltage into the first direct current signal; the second power supply module comprises a second conversion circuit, a second rectifying circuit and a second voltage division circuit which are sequentially and electrically connected between the alternating current power supply and the control loop; the second conversion circuit is used for converting the alternating current signal into a second alternating current signal; the second rectifying circuit is used for rectifying the second alternating current signal, dividing the voltage by the second voltage dividing circuit and converting the voltage into the second direct current signal; the third power supply module comprises a third conversion circuit, a third rectifying circuit and a third voltage dividing circuit which are sequentially and electrically connected between the alternating current power supply and the power supply signal input end of the overload relay; the third conversion circuit is used for converting the alternating current signal into a third alternating current signal; the third rectifying circuit is used for rectifying the third alternating current signal, dividing the voltage by the third voltage dividing circuit and converting the voltage into the third direct current signal.

Optionally, the first conversion circuit includes a first transformer; the second conversion circuit comprises a second transformer; the third conversion circuit comprises a third transformer; the primary side of the first transformer is multiplexed into the primary side of the second transformer and the primary side of the third transformer; the number of turns of the coil on the secondary side of the first transformer, the number of turns of the coil on the secondary side of the second transformer, and the number of turns of the coil on the secondary side of the third transformer are different.

Optionally, the first power module further includes a first voltmeter; the first voltmeter is electrically connected with the output end of the first voltage division circuit; the first voltmeter is used for displaying the voltage of the first direct current signal; the second power module further comprises a second voltmeter; the second voltmeter is electrically connected with the output end of the second voltage division circuit; the second voltmeter is used for displaying the voltage of the second direct current signal; the third power module further comprises a third voltmeter; the third voltmeter is electrically connected with the output end of the third voltage division circuit; the third voltmeter is used for displaying the voltage of the third direct current signal.

Optionally, the first voltage dividing circuit includes a first voltage stabilizing chip, a first voltage dividing resistor, and a first variable resistor; the input end of the first voltage stabilizing chip is electrically connected with the output end of the first rectifying circuit, the control end of the first voltage stabilizing chip is electrically connected with the first end of the first variable resistor, and the output end of the first voltage stabilizing chip is electrically connected with the second end of the first variable resistor through the first divider resistor; the second voltage division circuit comprises a second voltage stabilizing chip, a second voltage division resistor and a second variable resistor; the input end of the second voltage stabilizing chip is electrically connected with the output end of the second rectifying circuit, the control end of the second voltage stabilizing chip is electrically connected with the first end of the second variable resistor, and the output end of the second voltage stabilizing chip is electrically connected with the second end of the second variable resistor through the second voltage dividing resistor; the third voltage division circuit comprises a third voltage stabilizing chip, a third voltage division resistor and a third variable resistor; the input end of the third voltage stabilizing chip is electrically connected with the output end of the third rectifying circuit, the control end of the third voltage stabilizing chip is electrically connected with the first end of the third variable resistor, and the output end of the third voltage stabilizing chip is electrically connected with the second end of the third variable resistor through the third voltage dividing resistor.

Optionally, the first power module further includes a first voltage regulating button; the first voltage regulating button is connected with the sliding sheet of the first variable resistor; the second power supply module further comprises a second voltage regulating button; the second voltage regulating button is connected with the sliding sheet of the second variable resistor; the third power supply module further comprises a third voltage regulating button; and the third voltage regulating button is connected with the sliding sheet of the third variable resistor.

Optionally, the power supply device of the dc motor control center further includes: a first auxiliary module, a second auxiliary module and a third auxiliary module; the first auxiliary module is connected with the first power supply module in parallel; the first auxiliary module is used for providing a first auxiliary voltage for the first power supply module; the second auxiliary module is connected with the second power supply module in parallel; the second auxiliary module is used for providing a second auxiliary voltage for the second power supply module; the third auxiliary module is connected with the third power supply module in parallel; the third auxiliary module is used for providing a third auxiliary voltage for the third power supply module.

Optionally, the first auxiliary module includes a fourth transformer; the second auxiliary module comprises a fifth transformer; the third auxiliary module comprises a sixth transformer; the primary side of the first transformer is further multiplexed into the primary side of the fourth transformer, the primary side of the fifth transformer, and the primary side of the sixth transformer.

The embodiment of the utility model provides a power supply unit of direct current motor control center, including first power module, second power module and third power module, the input of first power module, the input of second power module and the input of third power module all are connected with alternating current power supply electricity, the output of first power module is connected with the power return circuit electricity of direct current motor control center, the output of second power module is connected with the control return circuit electricity of direct current motor control center, the output of third power module is connected with the power signal input of the overload relay of direct current motor control center; the alternating current signal of the alternating current power supply is converted into a first direct current signal through the first power supply module and transmitted to the power supply loop, the alternating current signal is converted into a second direct current signal through the second power supply module and transmitted to the control loop, the alternating current signal is converted into a third direct current signal through the third power supply module and transmitted to the overload relay, power supply of each power utilization loop of the direct current motor control center is achieved, in the debugging process of the direct current motor control center, the problem of wiring errors can be avoided, the working efficiency is improved, and the operation danger is reduced.

Drawings

Fig. 1 is a block diagram of a power supply device of a dc motor control center according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a connection between a power supply device and an overload relay of a dc motor control center according to an embodiment of the present invention;

fig. 3 is a block diagram of a power supply device of another dc motor control center according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a power supply device of a dc motor control center according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a power supply device of another dc motor control center according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a block diagram of a power supply device of a dc motor control center according to an embodiment of the present invention. As shown in fig. 1, the dc motor control center 10 includes a power supply circuit 11, a control circuit 12, and an overload relay 13, and a power supply device 20 of the dc motor control center includes a first power supply module 21, a second power supply module 22, and a third power supply module 23; the input end of the first power supply module 21, the input end of the second power supply module 22 and the input end of the third power supply module 23 are all electrically connected with an alternating current power supply 30; the output end of the first power supply module 21 is electrically connected with the power supply loop 11; the first power module 21 is configured to convert an ac signal of the ac power supply 30 into a first dc signal, and output the first dc signal to the power loop 11; the output end of the second power supply module 22 is electrically connected with the control loop 12; the second power module 22 is configured to convert the ac signal into a second dc signal, and output the second dc signal to the control circuit 12; the output end of the third power module 23 is electrically connected with the power signal input end (not shown in the figure) of the overload relay 13; the third power module 23 is configured to convert the ac signal into a third dc signal, and output the third dc signal to the overload relay 13; the voltage values of the first direct current signal, the second direct current signal and the third direct current signal are different from each other.

Specifically, the dc motor control center 10 may be a device for implementing start and brake control of a dc motor (not shown in the figure), and the dc motor control center 10 includes a power supply circuit 11, a control circuit 12, and a motor overload protection device (not shown in the figure). The power supply loop 11 is mainly used for supplying power to the direct current motor; the control circuit 12 is used for controlling the on or off of the power supply circuit 11; the motor overload protection device is used for timely switching off the direct current motor control center 10 when the direct current motor fails. The motor overload protection device is integrated with an overload relay 13, and when the direct current motor fails, the overload relay 13 is used for switching off the direct current motor control center 10. Because the design of the dc motor control center 10 is complex, the dc motor control center 10 needs to be debugged before normal operation, or the dc motor control center 10 needs to be occasionally subjected to maintenance test, that is, different levels of power supplies are provided for the power circuit 11, the control circuit 12 and the overload relay 13 of the dc motor control center 10, and an operation state is simulated to test whether each device in the dc motor control center 10 is normal. In the process of debugging the direct current motor control center 10, because the test loops are more and the wiring is complex, the conditions of wiring errors and damage of the electric devices are easy to occur, the working efficiency is influenced, and certain electric shock danger exists. In addition, according to the type of the dc motor, the voltage to be supplied to the power supply circuit 11 of the dc motor control center 10 is different, the voltage to be supplied to the control circuit 12 is different, and the power supply voltage of the overload relay 13 is also different, so that if different dc motor control centers 10 are debugged, different power supply devices need to be supplied, and the test cost is high.

To the above technical problem, the embodiment of the utility model provides a through integrated three power module in power supply unit 20 at dc motor control center, be first power module 21, second power module 22 and third power module 23 respectively, this three power module can convert alternating current power supply 30's alternating voltage into three direct current signal that has different magnitude of voltage respectively to provide in the different return circuits to dc motor control center. At this time, the input end of the first power module 21, the input end of the second power module 22, and the input end of the third power module 23 are all electrically connected to the ac power supply 30, the output end of the first power module 21 is electrically connected to the power supply circuit 11, the output end of the second power module 22 is electrically connected to the control circuit 12, and the output end of the third power module 23 is electrically connected to the power supply signal input end of the overload relay 13. The first power module 21 may convert the ac voltage into a first dc signal required by the power loop 11, and transmit the first dc signal to the power loop 11; the second power module 22 can convert the ac voltage into a second dc signal required by the control loop 12, and transmit the second dc signal to the control loop 12; the third power module 23 may convert the ac voltage into a third dc signal required by the overload relay 13 and transmit the third dc signal to the power signal input 131 of the overload relay 13.

The embodiment of the utility model provides a technical scheme, the power supply unit integration of the different grades that power return circuit, control circuit and overload relay need when debugging DC motor control center is for a power supply unit, when realizing each power consumption return circuit to DC motor control center respectively supplying power, still can avoid the problem of wiring mistake, improves work efficiency, reduces the operation danger.

Optionally, fig. 2 is a schematic diagram of connection between a power supply device of a dc motor control center and an overload relay according to an embodiment of the present invention. As shown in fig. 2, the output of the first power module 21 may also be electrically connected to the operating signal inputs (shown as-and S-) of the overload relay 13; the first power supply module 21 is also used to provide an operating voltage for the overload relay 13.

Specifically, the overload relay 13 is a switching device connected to the overload protection apparatus of the motor. When the dc motor control center 10 is debugged, it is also necessary to detect whether the overload relay 13 on the motor overload protection device is normal, that is, the first power module 21 is required to provide the overload relay 13 with the working voltage required by the motor overload protection device, and to test whether the overload relay 13 can be normally turned off when the motor overload protection device detects that the dc motor control center 10 has an overload fault. In this way, by multiplexing the first power module 21 as a voltage module that supplies operating voltage to the operating signal input terminal of the overload relay 13, it is not necessary to additionally provide a power module that supplies operating voltage to the overload relay 13, and thus the structure of the power supply device 20 of the dc motor control center can be further simplified, and the cost of the power supply device 20 of the dc motor control center can be reduced.

Optionally, with continued reference to fig. 2, the power supply apparatus 20 of the dc motor control center may further include: a time relay 24; the time relay 24 is connected in parallel with the third power module 23 to the power signal input terminals (S-and S + in the drawing) of the overload relay 13; the time relay 24 is used to display the time required for the overload relay 13 to perform overload protection.

The time relay 24 may be any switching device having a timing function. When the motor overload protection device detects that the direct current motor control center 10 has an overload fault, the overload relay 13 is required to perform overload protection action so as to stop the direct current motor control center 10. The criterion for judging whether the overload relay 13 is normal is to detect the time required for the overload relay 13 to perform the overload protection action when the overload fault occurs in the dc motor control center 10. In this way, by integrating the time relay 24 in the power supply device 20 of the dc motor control center, the time relay 24 is electrically connected to the power supply signal input terminal of the overload relay 13, and the time required for detecting the overload protection action of the overload relay 13 is acquired, so as to check the overload protection capability of the overload relay 13.

For example, when the first power module 21 transmits the first dc signal to the working signal input terminal of the overload relay 13 and the third power module 23 transmits the third dc signal to the power signal input terminal of the overload relay 13, the time relay 24 starts the timing function to start timing; if the overload relay 13 performs overload protection, the electric connection with the first power module 21 is disconnected, the electric connection with the third power module 23 is disconnected, the time relay 24 stops timing, and the time required by the overload relay 13 to perform overload protection is displayed, so that a worker can judge whether the time of performing overload protection action by the overload relay 13 is within a normal range according to the time displayed by the time relay 24, and if the time of performing overload protection action by the overload relay 13 is greater than the preset time, the abnormality of the overload relay 13 can be indicated; and when the time of the overload relay 13 performing the overload protection action is less than or equal to the preset time, it may indicate that the overload relay 13 is normal.

Optionally, fig. 3 is a block diagram of a power supply device of another dc motor control center according to an embodiment of the present invention. As shown in fig. 3, the first power module 21 may include a first conversion circuit 211, a first rectification circuit and 212, a first voltage divider circuit 213, which are electrically connected between the ac power source 30 and the power circuit 11 in sequence; the first conversion circuit 211 is configured to convert an ac signal into a first ac signal; the first rectifying circuit 212 is configured to rectify the first ac signal, divide the voltage by the first voltage dividing circuit 213, and convert the voltage into a first dc signal; the second power module 22 may include a second conversion circuit 221, a second rectification circuit 222, and a second voltage division circuit 223 electrically connected between the ac power supply 30 and the control circuit 12 in sequence; the second conversion circuit 221 is configured to convert the ac signal into a second ac signal; the second rectifying circuit 222 is configured to rectify the second ac signal, divide the voltage by the second voltage dividing circuit 223, and convert the second ac signal into a second dc signal; the third power module 23 may include a third conversion circuit 231, a third rectification circuit 232, and a third voltage division circuit 233, which are electrically connected in sequence between the ac power supply 30 and the power signal input terminal 131 of the overload relay 13; the third conversion circuit 231 is configured to convert the ac signal into a third ac signal; the third rectifying circuit 232 is configured to rectify the third ac signal, divide the voltage by the third voltage dividing circuit 233, and convert the voltage into a third dc signal.

The first conversion circuit 211, the second conversion circuit 221, and the third conversion circuit 231 are voltage transformation circuits capable of converting the ac voltage of the ac power supply 30 into different ac voltage values, respectively; the first rectifying circuit 212, the second rectifying circuit 222 and the third rectifying circuit 232 are rectifying circuits that can convert an alternating current signal into a direct current signal; the first voltage dividing circuit 213, the second voltage dividing circuit 223, and the third voltage dividing circuit 233 are each a voltage circuit that can divide and output a dc voltage differently. The first voltage dividing circuit 213 can freely divide and adjust the first dc signal, so as to output different power supply voltages required by the power supply loop 11; the second voltage dividing circuit 223 can perform free voltage dividing adjustment on the second direct current signal, so that different power supply voltages required by the direct control loop 12 can be output; the third voltage dividing circuit 233 can freely divide and adjust the third dc signal, so that different power supply voltages required by the overload relay 13 can be output.

Optionally, the first power module 21 may provide the first dc signal V1 in a range of 220V ≦ V1 ≦ 280V; the second power module 22 can provide the second DC signal V2 in a range of 24V & ltV & gt 2 & ltV & gt 48V; the third power module 23 can provide the third DC signal V3 in a range of 0.01V-3-0.1V.

Fig. 4 is a schematic structural diagram of a power supply device of a dc motor control center according to an embodiment of the present invention. Alternatively, as shown in fig. 4, the first conversion circuit 211 may include a first transformer T1; the second conversion circuit 221 may include a second transformer T2; the third conversion circuit 231 may include a third transformer T3; the primary side of the first transformer T1 is multiplexed into the primary side of the second transformer T2 and the primary side of the third transformer T3; the number of turns of the secondary side of the first transformer T1, the number of turns of the secondary side of the second transformer T2, and the number of turns of the secondary side of the third transformer T3 are different.

The first, second and third conversion circuits 211, 221 and 231 may be transformers for converting the ac signal of the ac power source 30 into ac signals of different levels, i.e., a first transformer T1, a second transformer T2 and a third transformer T3; at this time, the first transformer T1, the second transformer T2, and the third transformer T3 may share the same primary side coil to be electrically connected to the ac power source 30, and the first transformer T1, the second transformer T2, and the third transformer T3 may have different secondary side coils, so that the first transformer T1, the second transformer T2, and the third transformer T3 can convert the ac voltage of the ac power source 30 into ac signals having different ac voltage values. As described above, by multiplexing the primary side of the first transformer T1 to the primary sides of the second transformer T2 and the third transformer T3, it is not necessary to provide primary side coils of the first transformer T1, the second transformer T2, and the third transformer T3, respectively, and thus the configurations of the first conversion circuit 211, the second conversion circuit 221, and the third conversion circuit 231 can be simplified, the power supply device 20 in the dc motor control center can be simplified, and the cost of the power supply device 20 in the dc motor control center can be reduced.

Optionally, with continued reference to fig. 4, the first power module 21 may further include a first voltmeter 214; the first voltmeter 214 is electrically connected with the output end of the first voltage dividing circuit 213; the first voltmeter 214 is used for displaying the voltage of the first direct current signal; the second power module 22 may also include a second voltmeter 224; the second voltmeter 224 is electrically connected to the output terminal of the second voltage dividing circuit 223; the second voltmeter 224 is used for displaying the voltage of the second direct current signal; the third power module 23 may also include a third voltmeter 234; the third voltmeter 234 is electrically connected to the output end of the third voltage dividing circuit 233; the third voltmeter 234 is used for displaying the voltage of the third dc signal.

Specifically, a first voltmeter 214 is arranged between the first voltage dividing circuit 213 and the power supply circuit 11 to display the voltage divided by the first voltage dividing circuit 213, so that a technician can quickly and accurately adjust the power supply voltage required by the first voltage dividing circuit 213 to the power supply circuit 11; a second voltmeter 224 is arranged between the second voltage dividing circuit 223 and the control loop 12, and is used for displaying the voltage subjected to the voltage dividing processing by the second voltage dividing circuit 223, so that a technician can quickly and accurately adjust the power supply voltage required by the second voltage dividing circuit 223 to the control loop 12; a third voltmeter 234 is provided between the third voltage dividing circuit 233 and the overload relay 13, and is used for displaying the voltage divided by the third voltage dividing circuit 233, so that a technician can quickly and accurately adjust the power supply voltage required by the third voltage dividing circuit 233 to the overload relay 13; in this way, the power conversion efficiency of the power supply device 20 of the dc motor control center can be improved.

Alternatively, as shown IN fig. 4, the first rectifying circuit 212, the second rectifying circuit 222 and the third rectifying circuit 232 may comprise bridge rectifying circuits, and preferably, four diodes of the bridge rectifying circuits may be selected from IN4007 silicon type rectifying diodes.

Alternatively, with continued reference to fig. 4, the first voltage dividing circuit 213 may include a first voltage stabilization chip IC1, a first voltage dividing resistor R1, and a first variable resistor RP 1; the input end of the first voltage-stabilizing chip IC1 is electrically connected with the output end of the first rectifying circuit 212, the control end of the first voltage-stabilizing chip IC1 is electrically connected with the first end of the first variable resistor RP1, and the output end of the first voltage-stabilizing chip IC1 is electrically connected with the second end of the first variable resistor RP1 through the first voltage-dividing resistor R1; the second voltage dividing circuit 223 may include a second voltage stabilization chip IC2, a second voltage dividing resistor R2, and a second variable resistor RP 2; the input end of the second voltage-stabilizing chip IC2 is electrically connected with the output end of the second rectifying circuit 222, the control end of the second voltage-stabilizing chip IC2 is electrically connected with the first end of the second variable resistor RP2, and the output end of the second voltage-stabilizing chip IC2 is electrically connected with the second end of the second variable resistor RP2 through the second voltage-dividing resistor R2; the third voltage dividing circuit 233 may include a third voltage stabilization chip IC3, a third voltage dividing resistor R3, and a third variable resistor RP 3; an input end of the third voltage stabilization chip IC3 is electrically connected to an output end of the third rectification circuit 232, a control end of the third voltage stabilization chip IC3 is electrically connected to a first end of the third variable resistor RP3, and an output end of the third voltage stabilization chip IC3 is electrically connected to a second end of the third variable resistor RP3 through a third voltage dividing resistor R3.

The first voltage regulation chip IC1, the second voltage regulation chip IC2, and the third voltage regulation chip IC3 may be IC three-terminal integrated voltage regulation circuits, such as an LM317 integrated voltage regulation chip, for outputting a stable voltage; the first voltage-dividing resistor R1 has a current-limiting function on the first voltage-dividing circuit 213, the second voltage-dividing resistor R21 has a current-limiting function on the second voltage-dividing circuit 223, and the third voltage-dividing resistor R31 has a current-limiting function on the third voltage-dividing circuit 233, preferably, the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, and the third voltage-dividing resistor R3 may all include 1/2W-type metal film resistors; the first variable resistor RP1, the second variable resistor RP2 and the third variable resistor RP3 are all varistors whose resistance values can be adjusted by moving a slider, and preferably, organic solid trimming variable resistors can be selected. The first voltage stabilizing chip IC1, the first voltage dividing resistor R1 and the first variable resistor RP1 constitute a first voltage dividing circuit 213, and the voltage at the output end of the first voltage dividing circuit 213 is changed by adjusting the resistance value of the first variable resistor RP1, thereby adjusting the first dc signal of the first power module 21; the second voltage stabilizing chip IC2, the second voltage dividing resistor R2 and the second variable resistor RP2 constitute a second voltage dividing circuit 223, and the voltage at the output end of the second voltage dividing circuit 223 is changed by adjusting the resistance value of the second variable resistor RP2, so as to adjust the second direct current signal of the second power module 22; the third voltage-stabilizing chip IC3, the third voltage-dividing resistor R3, and the third variable resistor RP3 constitute the third voltage-dividing circuit 233, and the voltage at the output terminal of the third voltage-dividing circuit 233 is changed by adjusting the resistance value of the third variable resistor RP3, thereby adjusting the first dc signal of the third power module 23.

Optionally, fig. 5 is a schematic structural diagram of another power supply device of a dc motor control center according to an embodiment of the present invention. As shown in fig. 5, the first power module 21 may further include a first voltage adjustment button 215; the first voltage regulating button 215 is connected with a slide sheet of a first variable resistor RP 1; the second power module 22 may also include a second voltage adjustment button 225; the second voltage regulating button 225 is connected with the slide sheet of the second variable resistor RP 2; the third power module 23 may further include a third voltage adjustment button 235; the third voltage-regulating button 235 is connected to the slider of the third variable resistor RP 3.

The power supply device 20 of the direct current motor control center is further provided with a voltage regulating button connected with the sliding piece of the variable resistor, and the position of the sliding piece is moved through the voltage regulating button, so that the resistance value of the variable resistor is regulated, and the safety is improved.

With continued reference to fig. 5, the power supply device 20 of the dc motor control center can be connected to the ac power supply 30 through the ac power socket 31, so as to facilitate the use of the ac power supply 30; the ac power switch 32 is used to immediately disconnect the ac power supply 30 in case of an emergency during testing, thereby ensuring safety of personnel and equipment. The ground terminal 33 is internally connected to the housing of the power supply device 20 of the dc motor control center, and a grounded ground wire (not shown) is inserted into the ground terminal 33, thereby ensuring the safety of a person during use. The output voltage regulation of each power supply module is realized through respective up-down regulation voltage regulation buttons, and the current output voltage value is displayed through respective voltage meters; optionally, the voltage adjustment step is 1. A worker clicks a 'start' button, a 'start' indicator lamp is on, voltage is output, and a corresponding output terminal is electrified; clicking a stop button, turning on a stop indicating lamp and powering off an output terminal. In addition, when the worker clicks the "start" button of the third power module 23, the time relay 24 is turned on to start timing, and the timing time is displayed on the screen, and when the overload relay 13 performs the overload protection operation, the "stop" indicator light of the third power module 23 is turned on, and the time relay 24 stops timing. Each power module can be provided with 2 pairs of output terminals, and can be preferably connected with a standard phi 2.5mm test line.

Optionally, with continued reference to fig. 4, the first power module 21 may further include a first capacitor C1 and a second capacitor C2 connected in parallel between the first rectifying circuit 212 and the first voltage-dividing circuit 213, and a third capacitor C3 connected in parallel between the first voltage-dividing circuit 213 and the power loop 11; the second power module 22 may further include a fourth capacitor C4 and a fifth capacitor C5 connected in parallel between the second sorting circuit 222 and the second voltage dividing circuit 223, and a sixth capacitor C6 connected in parallel between the second voltage dividing circuit 223 and the control circuit 12; the third power module 23 may further include seventh and eighth capacitors C7 and C8 connected in parallel between the third sorting circuit 232 and the third voltage dividing circuit 233, and a ninth capacitor C9 connected in parallel between the third voltage dividing circuit 233 and the overload relay 13. The first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 may filter signals transmitted by the circuit, so as to stabilize the voltage. Preferably, the first capacitor C1, the fourth capacitor C4 and the seventh capacitor C7 may include aluminum electrolytic capacitors; the second, third, fifth, sixth, eighth, and ninth capacitors C6, C8, C9, C2, C3, C5, and C9 may comprise CD11-16V electrolytic capacitors.

Optionally, with continued reference to fig. 4, the power supply apparatus 20 of the dc motor control center may further include: a first auxiliary module 21 ', a second auxiliary module 22 ' and a third auxiliary module 23 '; the first auxiliary module 21' is connected in parallel with the first power supply module 21; the first auxiliary module 21' is used for providing a first auxiliary voltage for the first power supply module 21; the second auxiliary module 22' is connected in parallel with the second power module 22; the second auxiliary module 22' is used for providing a second auxiliary voltage for the second power supply module 22; the third auxiliary module 23' is connected in parallel with the third power module 23; the third auxiliary module 23' is used to provide a third auxiliary voltage for the third power supply module 23.

The first auxiliary module 21 ', the second auxiliary module 22 ' and the third auxiliary module 23 ' are auxiliary circuits that can convert an ac signal of the ac power supply 30 into a dc signal, and convert an ac voltage into a dc negative voltage to stabilize voltage signals of the first power supply module 21, the second power supply module 22 and the third power supply module 23, respectively.

Optionally, the first auxiliary module 21' may comprise a fourth transformer T4; the second auxiliary module 22' may include a fifth transformer T5; the third auxiliary module 23' may include a sixth transformer T6; the primary side of the first transformer T1 is also multiplexed into the primary side of a fourth transformer T4, the primary side of a fifth transformer T5, and the primary side of a sixth transformer T6.

As shown in fig. 4, the first auxiliary power supply 21 ' may include a fourth transformer T4, a first diode D1 ', a first current limiting resistor R1 ', a first zener diode VS1 ', and a first filter capacitor C1 '; the second auxiliary power supply 22 ' may include a fifth transformer T5, a second diode D2 ', a second current limiting resistor R2 ', a second zener diode VS2 ', and a second filter capacitor C2 '; the third auxiliary power supply 23 ' may include a fifth transformer T5, a third diode D3 ', a third current limiting resistor R3 ', a third zener diode VS3 ', and a third filter capacitor C3 '. The primary side of the fourth transformer T4, the primary side of the fifth transformer T5, and the primary side of the sixth transformer T6 are multiplexed with the primary side of the first transformer T1, and the number of turns of the coil on the secondary side of the fourth transformer T4, the number of turns of the coil on the secondary side of the fifth transformer T5, and the number of turns of the coil on the secondary side of the sixth transformer T6 may be set to be different, so that different auxiliary voltages are provided for the first power module 21, the second power module 22, and the third power module 23, and it is not necessary to separately set the primary side coils of the fourth transformer T4, the fifth transformer T5, and the sixth transformer T6, thereby simplifying the circuit configuration and contributing to reducing the cost of the power supply apparatus 20 of the dc motor control center. Preferably, the first diode D1 ', the second diode D2 ', and the third diode D3 ' may include an IN4007 silicon type rectifier diode; the first current limiting resistor R1 ', the second current limiting resistor R2 ' and the third current limiting resistor R3 ' may comprise a 1/2W-type metal film resistor; the first, second, and third zener diodes VS1 ', VS2 ', VS3 ' may comprise IN4106 or 2CW60 silicon zener diodes; the first, second, and third filter capacitors C1 ', C2 ', C3 ' may include aluminum electrolytic capacitors.

The embodiment of the utility model provides a power supply unit at DC motor control center, alternating current signal through first power module with alternating current power supply converts first direct current signal and transmits to power return circuit, second power module converts alternating current signal into second direct current signal and transmits to control circuit, overload relay in third power module converts alternating current signal into third direct current signal and transmission, realize supplying power respectively to each power consumption return circuit at DC motor control center, still can avoid the problem of wiring mistake, and the work efficiency is improved, and the operation danger is reduced.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A power supply device of a direct current motor control center comprises a power supply loop, a control loop and an overload relay, and is characterized in that the power supply device of the direct current motor control center comprises a first power supply module, a second power supply module and a third power supply module;

the input end of the first power supply module, the input end of the second power supply module and the input end of the third power supply module are all electrically connected with an alternating current power supply;

the output end of the first power supply module is electrically connected with the power supply loop; the first power supply module is used for converting an alternating current signal of the alternating current power supply into a first direct current signal and outputting the first direct current signal to the power supply loop;

the output end of the second power supply module is electrically connected with the control loop; the second power supply module is used for converting the alternating current signal into a second direct current signal and outputting the second direct current signal to the control loop;

the output end of the third power supply module is electrically connected with the power supply signal input end of the overload relay; the third power supply module is used for converting the alternating current signal into a third direct current signal and outputting the third direct current signal to the overload relay;

wherein voltage values of the first direct current signal, the second direct current signal and the third direct current signal are different from each other.

2. The power supply device of the direct current motor control center according to claim 1, wherein the output terminal of the first power supply module is further electrically connected to an operation signal input terminal of the overload relay;

the first power supply module is also used for providing working voltage for the overload relay.

3. The power supply apparatus of a dc motor control center according to claim 1, further comprising: a time relay;

the time relay and the third power supply module are connected in parallel to a power supply signal input end of the overload relay; and the time relay is used for displaying the time required by the overload relay for overload protection.

4. The power supply apparatus of a direct current motor control center according to claim 1,

the first power supply module comprises a first conversion circuit, a first rectifying circuit and a first voltage division circuit which are sequentially and electrically connected between the alternating current power supply and the power supply loop; the first conversion circuit is used for converting the alternating current signal into a first alternating current signal; the first rectifying circuit is used for rectifying the first alternating current signal, dividing the voltage by the first voltage dividing circuit and converting the voltage into the first direct current signal;

the second power supply module comprises a second conversion circuit, a second rectifying circuit and a second voltage division circuit which are sequentially and electrically connected between the alternating current power supply and the control loop; the second conversion circuit is used for converting the alternating current signal into a second alternating current signal; the second rectifying circuit is used for rectifying the second alternating current signal, dividing the voltage by the second voltage dividing circuit and converting the voltage into the second direct current signal;

the third power supply module comprises a third conversion circuit, a third rectifying circuit and a third voltage dividing circuit which are sequentially and electrically connected between the alternating current power supply and the power supply signal input end of the overload relay; the third conversion circuit is used for converting the alternating current signal into a third alternating current signal; the third rectifying circuit is used for rectifying the third alternating current signal, dividing the voltage by the third voltage dividing circuit and converting the voltage into the third direct current signal.

5. The power supply apparatus of a direct current motor control center according to claim 4, wherein the first conversion circuit includes a first transformer; the second conversion circuit comprises a second transformer; the third conversion circuit comprises a third transformer;

the primary side of the first transformer is multiplexed into the primary side of the second transformer and the primary side of the third transformer; the number of turns of the coil on the secondary side of the first transformer, the number of turns of the coil on the secondary side of the second transformer, and the number of turns of the coil on the secondary side of the third transformer are different.

6. The power supply apparatus of a direct current motor control center according to claim 4,

the first power supply module further comprises a first voltmeter; the first voltmeter is electrically connected with the output end of the first voltage division circuit; the first voltmeter is used for displaying the voltage of the first direct current signal;

the second power module further comprises a second voltmeter; the second voltmeter is electrically connected with the output end of the second voltage division circuit; the second voltmeter is used for displaying the voltage of the second direct current signal;

the third power module further comprises a third voltmeter; the third voltmeter is electrically connected with the output end of the third voltage division circuit; the third voltmeter is used for displaying the voltage of the third direct current signal.

7. The power supply apparatus of a direct current motor control center according to claim 4,

the first voltage division circuit comprises a first voltage stabilizing chip, a first voltage division resistor and a first variable resistor; the input end of the first voltage stabilizing chip is electrically connected with the output end of the first rectifying circuit, the control end of the first voltage stabilizing chip is electrically connected with the first end of the first variable resistor, and the output end of the first voltage stabilizing chip is electrically connected with the second end of the first variable resistor through the first divider resistor;

the second voltage division circuit comprises a second voltage stabilizing chip, a second voltage division resistor and a second variable resistor; the input end of the second voltage stabilizing chip is electrically connected with the output end of the second rectifying circuit, the control end of the second voltage stabilizing chip is electrically connected with the first end of the second variable resistor, and the output end of the second voltage stabilizing chip is electrically connected with the second end of the second variable resistor through the second voltage dividing resistor;

the third voltage division circuit comprises a third voltage stabilizing chip, a third voltage division resistor and a third variable resistor; the input end of the third voltage stabilizing chip is electrically connected with the output end of the third rectifying circuit, the control end of the third voltage stabilizing chip is electrically connected with the first end of the third variable resistor, and the output end of the third voltage stabilizing chip is electrically connected with the second end of the third variable resistor through the third voltage dividing resistor.

8. The power supply apparatus of a direct current motor control center according to claim 7,

the first power supply module further comprises a first voltage regulating button; the first voltage regulating button is connected with the sliding sheet of the first variable resistor;

the second power supply module further comprises a second voltage regulating button; the second voltage regulating button is connected with the sliding sheet of the second variable resistor;

the third power supply module further comprises a third voltage regulating button; and the third voltage regulating button is connected with the sliding sheet of the third variable resistor.

9. The power supply apparatus of a dc motor control center according to claim 5, further comprising: a first auxiliary module, a second auxiliary module and a third auxiliary module;

the first auxiliary module is connected with the first power supply module in parallel; the first auxiliary module is used for providing a first auxiliary voltage for the first power supply module;

the second auxiliary module is connected with the second power supply module in parallel; the second auxiliary module is used for providing a second auxiliary voltage for the second power supply module;

the third auxiliary module is connected with the third power supply module in parallel; the third auxiliary module is used for providing a third auxiliary voltage for the third power supply module.

10. The power supply apparatus of a dc motor control center according to claim 9, wherein the first auxiliary module includes a fourth transformer; the second auxiliary module comprises a fifth transformer; the third auxiliary module comprises a sixth transformer;

the primary side of the first transformer is further multiplexed into the primary side of the fourth transformer, the primary side of the fifth transformer, and the primary side of the sixth transformer.

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