CN207691428U - Control circuit - Google Patents

Abstract

The embodiment of the application provides a control circuit, which is used for controlling a main power device to supply power; the control circuit includes: the starting circuit comprises a first sub-circuit, a second sub-circuit and a starting module; the first sub-circuit is connected with the first phase line and is provided with a starting switch, and under the condition that the starting switch is closed, the first sub-circuit is electrically connected with the starting module; the second sub-circuit is connected with a second phase line, and is electrically connected with the starting module under the condition that the starting switch is closed; wherein the first phase line and the second phase line have different phases; the starting module is used for controlling the main power device to be electrified under the condition that the starting switch is closed. The problem that the voltage of a control circuit is insufficient due to overlarge current when the main circuit equipment is started is solved, and the main circuit equipment is started stably.

Description

Control circuit

Technical field

This application involves electronic technology field, more particularly to a kind of control circuit.

Background technology

Currently, main circuit (power supply circuit) is powered, when main power apparatus, such as electric motor starting of adjusting a wage scale, starting moment, electricity Stream is very big.In the case where a main circuit and control circuit share power supply, main circuit current is very big when startup, may cause with The control circuit voltage that main circuit shares power supply is less than rated voltage, control circuit spread of voltage.In this way so that in main circuit In cannot normally be contacted with the relevant contact of control circuit, for example, when it is disconnected when connect, there may be the possibilities burnt for the contact.

Under normal circumstances, frequency converter can be used in main circuit so that equipment smooth starting, but frequency converter expense compared with It is high.

Utility model content

The application embodiment provides a kind of control circuit, when preventing the main power apparatus startup in power supply circuit, control The under-voltage work of circuit processed.

The application embodiment provides a kind of control circuit, for controlling main power device power supply；The control circuit Including：First sub-circuit, the second sub-circuit and starting module；First sub-circuit is connect with the first phase line, and with startup Switch, in the case where the starting switch is closed, first sub-circuit is electrically connected with the starting module；Described second Sub-circuit is connect with the second phase line, in the case where the starting switch is closed, second sub-circuit and the starting module It is electrically connected；Wherein, first phase line is different from the phase of the second phase line；The starting module is used in the startup In the case that switch is closed, controls the main power device and be powered.

In one embodiment, the control circuit further includes third sub-circuit；The third sub-circuit and the neutral conductor Connection, in the case where the starting switch is closed and second sub-circuit disconnects, the third sub-circuit and the startup Module is electrically connected.

In one embodiment, it further includes time control module to state control circuit；The time control module is for controlling It makes in the first duration after starting switch closure, the third sub-circuit disconnects and second sub-circuit and the startup mould Block is electrically connected；After first duration, second sub-circuit disconnects and the third sub-circuit and the starting module It is electrically connected.

In one embodiment, the starting module is contactor；The contactor includes contactor coil and contact Device contact switch；For contacts of contactor switch in in the power supply circuit of main power device, the contactor coil is in described In control circuit.

In one embodiment, described first when it is 2 to 3 seconds a length of.

In one embodiment, the time control module is the time relay；The time relay includes the time The contact switch of relay coil and the time relay；Wherein, the time relay is in parallel with the starting module connects It connects, the contact switch includes the first delay normally-closed contact switch and the second delay normally opened contact switch；First delay is normal Closed contact switch is in second sub-circuit, for being disconnected after first duration；The second delay normally opened contact is opened It closes and is in the third sub-circuit, for being closed after first duration.

In one embodiment, the time relay further includes the second delay normally opened contact switch；Described second prolongs When normally opened contact switch it is in parallel with the starting switch.

In one embodiment, also it is in series with breaker in second sub-circuit.

In one embodiment, also it is in series with normally closed switch in first sub-circuit.

In one embodiment, the starting switch is normal open switch.

In one embodiment, the starting switch is normal open switch；The starting switch is series at first son In circuit.

In the application embodiment, which is connect by first sub-circuit with the first phase line, second son Circuit is connect with the second phase line, and voltage is in rated voltage 380V to the starting module for being on startup, to realize in main electricity When pipeline equipment starts, starting module voltage is improved, optimizes the start-up course of main circuit equipment, protects main circuit and corresponding equipment.

Description of the drawings

In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments described in application, for those of ordinary skill in the art, in the premise of not making the creative labor property Under, other drawings may also be obtained based on these drawings.

Fig. 1 is a high-level schematic functional block diagram of this specification embodiment；

Fig. 2 is a control circuit circuit diagram of this specification embodiment；

Fig. 3 is a startup control circuit status schematic diagram of this specification embodiment；

Fig. 4 be this specification embodiment a stabilization after control circuit circuit state schematic diagram；

Description of the drawings：1, power supply phase line L1,2, switch SB1,3, switch SB2,4, contactor KM, 5, time relay delay Disconnect normally-closed contact KT1,6, breaker, 7, power supply phase line L2,8, neutral point, 9, time relay timing closing normally opened contact KT2,10, time relay KT, 11, time relay timing closing normally opened contact KT3.

Specific implementation mode

In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality The attached drawing in example is applied, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described implementation Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common The every other embodiment that technical staff is obtained without making creative work should all belong to the application protection Range.

It should be noted that when an element is considered as " coupling " another element, it can be directly coupled to Another element may be simultaneously present centering elements.

Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the application The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein The purpose of the embodiment of body, it is not intended that in limitation the application.

This specification embodiment provides a kind of control circuit.The control circuit includes：First sub-circuit, the second son Circuit and starting module.

First sub-circuit is connect with the first phase line, and has starting switch, the case where the starting switch is closed Under, first sub-circuit is electrically connected with the starting module.

Second sub-circuit is connect with the second phase line, in the case where the starting switch is closed, the second son electricity Road is electrically connected with the starting module；Wherein, first phase line is different from the phase of the second phase line.

The starting module is used in the case where the starting switch is closed, and is controlled the main power device and is powered.Tool Body, starting module may include first unit and second unit, and the first unit is in control circuit, receive control electricity Current signal in road, the second unit are in the power supply circuit of main power device, the electricity for being received according to first unit Stream signal carries out control power supply circuit break-make.For example, contactor includes electromagnetic system and contact mechanism, electromagnetic system is according to control The current signal of circuit is converted into electromagnetic signal, is closed or beats by contact mechanism of the electromagnetic signal control in power supply circuit It opens.

In the present embodiment, the starting module, in the case where the starting module is powered, connecting main circuit Power supply.Specifically, for example, starting module can be contactor, in control circuit, contactor is powered, then corresponding main circuit In, contacts of contactor is closed, and main circuit is powered, and the equipment of main circuit starts.The starting module is in control circuit.It is described Starting module can be any specific element for realizing the function.

In the present embodiment, starting switch is used to control the energization of the control circuit.The starting switch can be The normal open switch or other control switches of series connection in circuit.For example, after pressing normal open switch, control circuit is powered, After the power for being applied to normal open switch disappears, the normal open switch can bounce automatically.In such as one other control switch, such as Quick switch of photosensitive switch sound etc..

In the present embodiment, first sub-circuit is connect with the first phase line, second sub-circuit and the second phase line Connection, for providing 380V rated voltages to the starting module.Specifically, the main circuit, the control circuit share one A power supply, main circuit connect three-phase four-wire power, and work rated voltage 380V, and the starting module is connected on the first son electricity Between road and second sub-circuit.When the control circuit energization starts, the starting module is in the rated voltage of 380V. Specifically, for example, a phase line, that is, firewire of the input terminal connection three-phase four-wire power of first sub-circuit, first son The output end of circuit connects the starting module；The input terminal connection starting module of second sub-circuit, described second Another phase line of the output end connection three-phase four-wire power of sub-circuit.It is described then in the case where the starting switch is closed Starting module is in the operating mode of rated voltage 380V.In the case that the starting module meets voltage request, main circuit work Contact closure, main circuit equipment start.Specifically, the first sub-circuit may include circuit connection, normal open switch, normally closed switch etc. Deng.Second sub-circuit may include circuit connection, breaker, switch etc..

In the case where main circuit and control circuit share power supply, when main circuit equipment starts, such as motor, it will produce electricity Big phenomenon is flowed through, because at this point, motor does not rotate also, according to the conservation of energy, the conversion of electric energy and mechanical energy has delay, institute With when equipment starts electric current it is excessive.When main circuit current is excessive, because sharing power supply with control circuit, lead to control electricity Road voltage reduces, and the rated voltage 220V that the virtual voltage of control circuit is far below, the starting module of control circuit cannot Normal work.By this specification embodiment, on startup, the control circuit is connected, and the starting module is in specified Under the operating mode of voltage 380V, main circuit equipment smooth starting is protected.This specification embodiment is in the premise for not changing main circuit Under, by improving control circuit, to protect the smooth starting of main circuit equipment.

Referring to Fig. 2, for a specific implementation scene of this specification.It is constant that Fig. 2 illustrates main circuit in this scene In the case of, a control circuit circuit connection diagram.

In this Sample Scenario, it is connected between first sub-circuit and second sub-circuit in contactor 4, it is described First sub-circuit input terminal connects power supply phase line 1, and the input terminal and output end of the contactor are separately connected the first son electricity The input terminal of the output end on road and second sub-circuit, another phase line neutrality of the second sub-circuit output end connection power supply 7. The output end of the contactor can also connect the input terminal of third sub-circuit, and the output point connection of the third sub-circuit is neutral Point 8.

In this implement scene, electric current enters control circuit from power supply phase line 1, and after power supply phase line, there are one open for series connection 2 are closed, switch 2 is a normally closed switch, after by lower switch 2, down circuitry, i.e., the close button in corresponding usually life, After pressing down, switch 2 disconnects, and after force releases, switch 2, which resets, to be closed.

In this implement scene, it can also be in series with switch 3 after switch 2, switch 3 can be a normal open switch, When initial, switch 3 disconnects, control circuit power-off, and by pressing lower switch 3, control circuit is powered, i.e., opening in corresponding usually life Dynamic button, after pressing down, switch 3 is closed, and after force releases, switch 3, which resets, to be disconnected.

In this implement scene, contactor 4 is connected in series with after switch, the rated voltage of the contactor 4 is 220V, The contactor 4 in operating conditions, can be such that the corresponding contact closure of main circuit, main circuit powers on, main circuit equipment Start.

In this implement scene, the second sub-circuit coupling power supply phase line 7 after contactor is connected with control in circuit In the case of, contactor 4 is in rated voltage 380V working conditions；The third sub-circuit couples neutral point 8, with control the In the case that three sub-circuits are connected, contactor 4 is in rated voltage 220V working conditions.

In this implement scene, it is disconnected that time relay delay is also in series in second sub-circuit after contactor 4 Normally-closed contact 5 is opened, so that when the time relay works, be delayed break contact 5 so that second sub-circuit disconnects.

In this implement scene, time relay delay can protect electricity after disconnecting normally-closed contact 5 with series trip device 6 Road.For example, when control circuit work is abnormal, when coil short, breaker disconnects, and protects circuit.

In this implement scene, it is also in series with time relay delay in the third sub-circuit after contactor 4 and closes Normally opened contact 9 is closed, so that when the time relay works, timing closing contact 9 so that third sub-circuit is connected to.

In this implement scene, the time relay 10 is in parallel with the contactor 4, after by lower switch 3, the time relay Between the first sub-circuit and the second sub-circuit, it is powered.The time relay can set delay length, i.e. the first duration Size, when time relay conduction time meeting the first duration, the time relay controls its corresponding contact 5, contact 9, touches 11 switch of point makes corresponding operating.

In this Sample Scenario, it can also be parallel with time relay timing closing normally opened contact 11 with the switch 3, After lower switch 3, the contactor and the time relay power on, after the first duration, time relay timing closing Normally opened contact 11 is closed.In this manner it is achieved that when bouncing of switch 3, control circuit still works normally, user-friendly.

Referring to Fig. 3, Fig. 3 is in this Sample Scenario, by the first duration inner control circuit state after lower switch 3.Its The delay of the middle time relay disconnects normally-closed contact 5 and is in closed state, and timing closing normally opened contact 9 and timing closing are normally opened tactile Point 10 is off, and circuit 1-2-3-4-5-6-7 is powered, and contactor 4 is in rated voltage 380V.

Referring to Fig. 4, Fig. 4 is in this Sample Scenario, by control circuit state after the first duration after lower switch 3.Its The delay of the middle time relay disconnects normally-closed contact 5 and is off, and timing closing normally opened contact 9 and timing closing are normally opened tactile Point 10 is in closed state, and circuit 1-2-3-4-5-9-8 is powered, and contactor 4 is in rated voltage 220V, and switch 3 can be at this time It is off.Wherein, 5,9,11 in Fig. 3, Fig. 4 are used to illustrate the opening closed form of the time relay contact switch State.

By this Sample Scenario, the repacking to control circuit is realized, form a new control circuit, save cost, side Just user's operation.

In one embodiment, the control circuit further includes third sub-circuit；The third sub-circuit and the neutral conductor Connection, in the case where the starting switch is closed and second sub-circuit disconnects, the third sub-circuit and the startup Module is electrically connected.

In the present embodiment, the output end of the third sub-circuit is electrically connected the neutral point of three-phase four-wire power, institute The input terminal for stating third sub-circuit is connected with the starting module.In the case where the third sub-circuit is powered, the startup Module is under the operating mode of rated voltage 220V.

By the above embodiment, may be implemented when being worked normally after main circuit equipment starts, main circuit current restores To normal condition, the control circuit supply voltage can also meet the operating voltage of starting module, and the third sub-circuit is anti- Only the starting module is constantly in overload, and waste of energy damages equipment.

In one embodiment, the control circuit further includes time control module；The time control module is used for It controls in the first duration after starting switch closure, the third sub-circuit disconnects and second sub-circuit and the startup Module is electrically connected；After first duration, second sub-circuit disconnects and the third sub-circuit and the startup mould Block is electrically connected.

In the present embodiment, the time control module, for the second sub-circuit connection in the first duration, described After first duration, second sub-circuit disconnects, and the third sub-circuit is connected.Specifically, for example, the time control Module can be a time relay, in first duration of the time relay after powered up, the corresponding time after Appliance contact controls second sub-circuit and connects, and the third sub-circuit disconnects so that when startup, starting module is in specified Voltage 380V.After first duration, corresponding time relay contact controls second sub-circuit and disconnects, the third Sub-circuit is connected so that after startup, starting module is in rated voltage 220V, and the starting module is prevented to be constantly in overload shape State.Wherein, the size of first duration can be set by the time control module.

In one embodiment, the starting module is contactor；The contactor includes contactor coil and contact Device contact switch；For contacts of contactor switch in in the power supply circuit of main power device, the contactor coil is in described In control circuit.

In the present embodiment, the rated operational voltage of contactor is 220V, and present embodiment is controlled by contactor The energization and disconnection of main circuit.

In an embodiment, first duration can be 2 to 3 seconds.Specifically, the time control module, control The second sub-circuit turn-on time is 2-3 seconds.For example, delay time length t, i.e. the first duration is arranged in the time relay For t, in time t, third sub-circuit disconnects, and the second sub-circuit is connected, and after the first duration, the second sub-circuit disconnects, The third sub-circuit is connected, and the working condition that contactor is converted into 220V from the working condition of rated voltage 380V is completed.2-3 The smooth starting of time enough main circuit equipments of second, meanwhile, if first duration is larger so that the starting module, Such as contactor, it is chronically at overload work state, starting module is caused to burn out.Certainly, in the present embodiment, 2-3 seconds are one A preferred time, 2-3 seconds duration boundary points can include to include.

In one embodiment, the time control module is the time relay；The time relay includes the time The contact switch of relay coil and the time relay；Wherein, the time relay is in parallel with the starting module connects It connects, the contact switch includes the first delay normally-closed contact switch and the second delay normally opened contact switch；First delay is normal Closed contact switch is in second sub-circuit, for being disconnected after first duration；The second delay normally opened contact is opened It closes and is in the third sub-circuit, for being closed after first duration.Specifically, in the present embodiment, can pass through The time relay controls in the first duration, and third sub-circuit disconnects, and the second sub-circuit is connected, after the first duration, the Two sub-circuits disconnect, and the third sub-circuit is connected, and realizes the conversion of the operating voltage of the starting module.

In one embodiment, the time relay further includes third delay normally opened contact switch；The third is prolonged When normally opened contact switch it is in parallel with the starting switch.

In the present embodiment, the third delay normally opened contact switch is in parallel with the starting switch.Specifically, example Such as, the third delay normally opened contact switch of the time relay control can be in parallel with normal open switch, is pressed in user normally opened Switch, after control circuit is powered, by time-delay relay, third delay normally opened contact switch is closed, then user can not have to again Off-state is returned back to normal open switch force or other signals, normal open switch, after once-through operation so that control circuit The operating mode of energization is still maintained, it is user-friendly

In one embodiment, breaker can also be in series in second sub-circuit.For being more than threshold in electric current Second sub-circuit is disconnected when value.Specifically, the breaker can be air switch etc..The breaker can connect coupling It is connected on second sub-circuit end.When electric current is excessive in the control circuit, when such as starting module short circuit, the breaker It disconnects, protects circuit.

In one embodiment, also it is in series with normally closed switch in first sub-circuit.Specifically, user can lead to It crosses normally closed switch and disconnects control circuit, be similar to stop button, it is described normally closed to open such as when user exerts a force to the normally closed switch Shutdown is opened, user-friendly.

In one embodiment, the starting switch is normal open switch；The starting switch is series at first son In circuit.Specifically, first sub-circuit can be in series with normal open switch, user can connect electricity by closing normal open switch Source, the normal open switch can exert a force on it to bounce when cancelling, user-friendly.Certainly, normal open switch is controlled herein Mode is not only to be controlled by power, can also be to be controlled by optical signal, voice signal etc..

It should be noted that in the description of the present application, term " first ", " second " etc. are used for description purposes only and distinguish Between the two and sequencing is not present in similar object, can not be interpreted as indicating or implying relative importance.In addition, In the description of the present application, unless otherwise indicated, the meaning of " plurality " is two or more.

It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch It states, many embodiments and many applications except the example provided all will be aobvious and easy for a person skilled in the art See.Therefore, the range of this introduction should not be determined with reference to foregoing description, but should with reference to preceding claims and this The full scope of the equivalent that a little claims are possessed determines.For comprehensive purpose, all articles and with reference to including special The disclosure of profit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims Any aspect is not intended to abandon the body matter, also should not be considered as applicant the theme is not thought of as it is disclosed Apply for a part for theme.

Claims (10)

1. a kind of control circuit, which is characterized in that for controlling main power device power supply；The control circuit includes：First son Circuit, the second sub-circuit and starting module；

First sub-circuit is connect with the first phase line, and has starting switch, in the case where the starting switch is closed, institute The first sub-circuit is stated to be electrically connected with the starting module；

Second sub-circuit is connect with the second phase line, in the case where the starting switch is closed, second sub-circuit with The starting module is electrically connected；Wherein, first phase line is different from the phase of the second phase line；

The starting module is used in the case where the starting switch is closed, and is controlled the main power device and is powered.

2. control circuit according to claim 1, which is characterized in that the control circuit further includes third sub-circuit；Institute Third sub-circuit is stated to connect with the neutral conductor, it is described in the case where the starting switch is closed and second sub-circuit disconnects Third sub-circuit is electrically connected with the starting module.

3. control circuit according to claim 2, which is characterized in that the control circuit further includes time control module； The time control module is used to control in the first duration after starting switch closure, third sub-circuit disconnection and described Second sub-circuit is electrically connected with the starting module；After first duration, second sub-circuit disconnects and described the Three sub-circuits are electrically connected with the starting module.

4. control circuit according to claim 1, which is characterized in that the starting module is contactor；The contactor It is switched including contactor coil and contacts of contactor；Contacts of contactor switch is in in the power supply circuit of main power device, institute Contactor coil is stated to be in the control circuit.

5. control circuit according to claim 3, which is characterized in that a length of 2 to 3 seconds when described first.

6. control circuit according to claim 3, which is characterized in that the time control module is the time relay；Institute State the contact switch that the time relay includes time relay coil and the time relay；Wherein, the time relay It is connected in parallel with the starting module, the contact switch includes the first delay normally-closed contact switch and the second delay normally opened contact Switch；The first delay normally-closed contact switch is in second sub-circuit, for being disconnected after first duration；It is described Second delay normally opened contact switch is in the third sub-circuit, for being closed after first duration.

7. control circuit according to claim 6, which is characterized in that the time relay further includes that third delay is normally opened Contact switch；The third delay normally opened contact switch is in parallel with the starting switch.

8. control circuit according to claim 1, which is characterized in that be also in series with breaker in second sub-circuit.

9. control circuit according to claim 1, which is characterized in that be also in series with normally closed open in first sub-circuit It closes.

10. control circuit according to claim 1, which is characterized in that the starting switch is normal open switch；The startup Switch is series in first sub-circuit.