CN112947189B - Multi-path power-on/power-off control circuit and communication power supply system - Google Patents

Abstract

The invention relates to a multi-path power-on/power-off control circuit and a communication power supply system, the circuit comprises at least one path of current direction control circuit and at least one path of current time control circuit, wherein each path of current direction control circuit is respectively and electrically connected with a coil of a contactor, the current time control circuit is electrically connected with the coil of the contactor, the current direction control circuit controls the current direction flowing through the coil of the contactor, the power-on/power-off of the contactor is controlled through different current directions, the current time control circuit controls the current time flowing through the coil of the contactor, and further controls the power-on/power-off time of the contactor, therefore, compared with the traditional circuit that each path of power-on/power-off electric contactor needs to pass through one path of current time control circuit, the multi-path power-on/power-off control circuit only needs to control the multi-path power-on/power-off electric contactor through one path of current time control circuit, the circuit structure is simple, and the circuit cost is reduced.

Description

Multi-path power-on/power-off control circuit and communication power supply system

Technical Field

The invention relates to the field of power-on/power-off control circuits, in particular to a multi-path power-on/power-off control circuit and a communication power supply system.

Background

The multi-path power-on/power-off control circuit is generally applied to a communication power supply system, and is used for controlling the power-on/power-off of the contactor and further controlling the power-on/power-off of the load.

However, for each circuit of contactor, the current multi-path power-on/power-off control circuit needs one path of current direction control circuit and one path of current time control circuit, and for the multi-path power-on/power-off system, the multi-path current direction control circuit and the multi-path current time control circuit are needed, so that the whole circuit is complex to control and the cost is high.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a multi-path power-on/power-off control circuit and a communication power supply system, so as to control multi-path power-on/power-off through one path of current-through time control circuit, the control method is simple, and the circuit cost is reduced.

In order to solve the above technical problem, one technical solution adopted by the embodiments of the present invention is:

in a first aspect, an embodiment of the present invention provides a multi-path power-on/power-off control circuit, which is applied to a multi-path power-on/power-off contactor, and includes: at least one path of current direction control circuit and current time control circuit;

each path of the through-flow direction control circuit is electrically connected with a coil of the contactor respectively, the through-flow direction control circuits correspond to the contactors one by one, and the through-flow direction control circuits are used for controlling the direction of current flowing through the coils of the contactors so as to control the power-on/power-off of the contactors;

and the coils of all the contactors are electrically connected with the through-current time control circuit, and the through-current time control circuit is used for controlling the current time flowing through the coils of the contactors.

In some embodiments, each of the current direction control circuits includes a relay module and a first switch module, a coil of the relay module is electrically connected to a positive electrode of a first dc power supply and an input terminal of the first switch module, a common contact of the relay module is electrically connected to a coil of the contactor, a normally open contact and a normally closed contact of the relay module are electrically connected to a positive electrode of a second dc power supply and a negative electrode of the second dc power supply, respectively, and the relay module is configured to control a current direction of the coil of the contactor;

the control end of the first switch module is used for receiving corresponding control signals, the output end of the first switch module is grounded, and the first switch module is used for controlling the contact action of the relay module.

In some embodiments, the common contacts of the relay module include a first common contact and a second common contact, the normally open contacts of the relay module include a first normally open contact and a second normally open contact, the normally closed contacts of the relay module include a first normally closed contact and a second normally closed contact, the first common contact is connected with one end of the coil of the contactor, the second common contact is connected with the other end of the coil of the contactor, the first normally closed contact and the first normally open contact are connected with the negative electrode of the second direct current power supply respectively, and the second normally closed contact and the second normally open contact are connected with the positive electrode of the second direct current power supply respectively.

In some embodiments, the first switch module includes a transistor, a base of the transistor is configured to receive the corresponding control signal, a collector of the transistor is connected to the coil of the relay module, and an emitter of the transistor is grounded.

In some embodiments, the through-current time control circuit includes an isolation module and a second switch module, a first end of the isolation module is connected to a positive electrode of a first dc power supply, a second end of the isolation module is configured to receive a corresponding control signal, a third end of the isolation module is connected to a control end of the second switch module, a fourth end of the isolation module is connected to a positive electrode of a second dc power supply, and the isolation module is configured to isolate a connection state between the second dc power supply and the control end of the second switch module, so as to control an operating state of the second switch module;

the input of second switch module is connected with third DC power supply's positive pole, the output of second switch module with third DC power supply's negative pole is connected, just, the input of second switch module with the output of second switch module establish ties in the work circuit of contactor coil, the second switch module is used for control to flow through the current time of contactor coil.

In some embodiments, the isolation module includes an isolation optocoupler, a first end of the isolation optocoupler is connected to the positive electrode of the first dc power supply, a second end of the isolation optocoupler is configured to receive a corresponding control signal, a third end of the isolation optocoupler is connected to the control end of the second switch module, and a fourth end of the isolation optocoupler is connected to the positive electrode of the second dc power supply.

In some embodiments, the second switch module includes a MOS transistor, a gate of the MOS transistor is connected to the third terminal of the isolation module, a drain of the MOS transistor is connected to the positive electrode of the third dc power supply, a source of the MOS transistor is connected to the negative electrode of the third dc power supply, and the drain of the MOS transistor and the source of the MOS transistor are connected in series to the working circuit of the contactor coil.

In some embodiments, the negative pole of the first dc power source, the negative pole of the second dc power source, and the positive pole of the third dc power source are the same terminal.

In some embodiments, the protection circuit is electrically connected to the through-current time control circuit and each of the through-current direction control circuits, and is configured to perform reliable on-off protection on the through-current time control circuit and perform follow current protection on each of the through-current direction control circuits.

In a second aspect, an embodiment of the present invention provides a communication power supply system, including: the multi-path power-on/power-off control circuit and the power-on/power-off contactor as described above;

the multi-path power-on/power-off control circuit is electrically connected with the coil of the contactor and is used for controlling the current direction flowing through the coil of the contactor and the current time flowing through the coil of the contactor;

the contactor is used for controlling the power-on/power-off of the load.

The embodiment of the invention has the beneficial effects that: different from the prior art, in the embodiment of the invention, the multi-path power-on/power-off control circuit is applied to the multi-path power-on/power-off electric contactor and comprises at least one path of current direction control circuit and at least one path of current time control circuit, wherein each path of current direction control circuit is respectively electrically connected with the coils of the contactors, the current direction control circuits correspond to the contactors one by one, the current time control circuits are electrically connected with the coils of all the contactors, the current direction control circuits control the current direction flowing through the coils of the contactors, the power-on/power-off of the contactors are controlled through different current directions, the current time control circuits control the current time flowing through the coils of the contactors, and further control the power-on/power-off time of the contactors, therefore, compared with the traditional electric contactor of which each path of power-on/power-off electric contactor needs to pass through one path of current time control circuit In terms of the circuit, the multi-path power-on/power-off control circuit only needs to control the multi-path power-on/power-off contactor through one path of through-current time control circuit, the circuit structure is simple, and the circuit cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a communication power supply system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a multi-path power-on/power-off control circuit according to an embodiment of the present invention;

FIG. 3 is a schematic circuit diagram of a current direction control circuit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a circuit structure of one of the through-current time control circuits according to the embodiment of the present invention;

fig. 5 is a schematic circuit structure diagram of a multi-path power-on/power-off control circuit according to an embodiment of the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a communication power supply system according to an embodiment of the present invention. As shown in fig. 1, the communication power supply system 100 includes a plurality of power-on/power-off control circuits 10 and a contactor 20, wherein the plurality of power-on/power-off control circuits 10 are electrically connected to a coil of the contactor 20, contacts of the contactor 20 are electrically connected to a load, the contactor 20 is used for controlling power-on/power-off of the load 200, the plurality of power-on/power-off control circuits 10 control a current direction flowing through the coil of the contactor 20 to control power-on/power-off, and the plurality of power-on/power-off control circuits 10 also control a current time flowing through the coil of the contactor 20. For example, the two ends of the coil of the contactor 20 are respectively the a end and the B end, if the direction of the current flowing through the coil of the contactor is a direction flowing to B, the power-on is controlled, the load 200 is powered on, and if the direction of the current flowing through the coil of the contactor is B direction flowing to a, the power-off is controlled, the load 200 is powered off, wherein the time of the power-on and the power-off is controlled by the multi-path power-on/power-off control circuit 10.

Therefore, the communication power supply system can control the current direction and the current time flowing through the coil of the contactor through a plurality of paths of power-on/power-off control circuits, thereby controlling the power-on/power-off of the load and controlling the power-on/power-off time of the load.

Referring to fig. 2, fig. 2 is a multi-path power-on/power-off control circuit applied to a contactor 20, wherein the contactor 20 controls power-on/power-off of a load 200, the multi-path power-on/power-off control circuit 10 includes at least one current direction control circuit 11 and a current time control circuit 12, wherein, each path of the current direction control circuit 11 is respectively electrically connected with the coil of each path of the contactor 20, the current direction control circuit 11 is in one-to-one correspondence with the contactor 20, the current time control circuit 12 is electrically connected with the coils of all paths of the contactor 20, the current direction control circuit 11 controls the direction of the current flowing through the coil of the contactor 20, the current flow time control circuit 12 controls the time of the current flowing through the coil of the contactor 20 by controlling the power-up/power-down of the contactor 20 by different current directions.

Each of the contactors 20 corresponds to one of the current direction control circuits 11, the multiple contactors 20 correspond to only one of the current time control circuits 12, each of the contactors 20 controls the current direction of the coil flowing through the contactor 20 through the corresponding current direction control circuit 11, and controls the current time of the coil of the contactor 20 through the current time control circuit 12.

In some embodiments, the contactor 20 may be a pulse contactor or a magnetic latching contactor, the pulse contactor and the magnetic latching contactor have different control strategies, the pulse contactor needs to give a forward/reverse pulse current to a coil thereof to control powering down/up of the pulse contactor, if a forward pulse current is given to the pulse contactor to control powering down of the pulse contactor, the contactor always keeps the current state after the pulse current is ended until a reverse pulse current is given to the coil of the contactor, the state of the coil of the contactor is changed to control powering up of the contactor, the magnetic latching contactor needs to give a continuous current to control powering down of the magnetic latching contactor, the current duration is the duration of the powering down state, the powering up is automatically resumed after the current disappears, and only a through-flow direction control circuit needs to be used in a scene where the magnetic latching contactor is used; when the pulse contactor is used, a current direction control circuit and a current time control circuit are needed. Therefore, the multi-path power-on/power-off control circuit is compatible with the pulse contactor and the magnetic latching contactor and is suitable for different contactor control requirements.

For example: the current direction control circuit 11 controls the current direction of the coil of the contactor 20 to be a first direction, then controls the contactor 20 to be powered on, further controls the load 200 to be powered on, and controls the current time flowing through the coil of the contactor 20 through the current time control circuit 12; when the current direction control circuit 11 controls the current direction of the coil of the contactor 20 to be the second direction, the contactor 20 is controlled to be powered down, and further the load 200 is controlled to be powered down, and the current time flowing through the coil of the contactor 20 is controlled by the current time control circuit 12.

Meanwhile, for the multi-path contactor 20, the current direction control circuit 11 is also multi-path, which corresponds to the number of the contactors 20 one by one, and the current time control circuit 12 only has one path, and the current time of the contactors 20 of all paths is controlled by the one-path current time control circuit 12.

Therefore, compared with the traditional circuit that each circuit of contactor needs to pass through one circuit of through-current time control circuit, the multi-circuit power-on/power-off control circuit only needs to pass through one circuit of through-current time control circuit to control the multi-circuit contactor, the circuit structure is simple, and the circuit cost is reduced.

Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a multi-path power-on/power-off control circuit according to an embodiment of the present invention, as shown in fig. 3, each path of current direction control circuit 11 includes a relay module 111 and a first switch module 112, the relay module 111 includes a coil and a contact, wherein the coil of the relay module 111 is electrically connected to the positive electrode of the first dc power supply and the input end of the first switch module 112, the common contact of the relay module 111 is electrically connected to the coil of the contactor 20, the normally open contact and the normally closed contact of the relay module 111 are electrically connected to the positive electrode of the second dc power supply and the negative electrode of the second dc power supply, respectively, and the relay module 111 is used for controlling the current direction of the coil of the contactor.

If the coil of the relay module 111 is not connected with the first direct current power supply, the normally closed contact of the relay module 111 is connected with the common contact, so that the second direct current power supply flows into the coil of the contactor through the normally closed contact and the common contact; if the coil of the relay module 111 is connected to the first dc power supply, the normally open contact of the relay module 111 is connected to the common contact, and therefore the second dc power supply flows into the coil of the contactor through the normally open contact and the common contact, but the connection direction of the normally closed contact and the positive electrode of the second dc power supply and the connection direction of the normally open contact and the positive electrode of the second dc power supply are different, so that the current flowing into the coil of the contactor is different in direction, and the power-on/power-off of the contactor is controlled. In the embodiment of the present invention, the first dc power voltage is VCC, and the second dc power voltage is + 48V.

The control end of the first switch module 112 is configured to receive a corresponding control signal, the output end of the first switch module 112 is grounded, and the first switch module 112 is configured to control a contact action of the relay module 111. The on/off of the first switch module 112 can control whether the coil of the relay module 111 is connected to the first dc power supply, that is, whether the coil of the relay module 111 is energized, so as to control the contact action of the relay module 111. If the first switch module 112 is turned on, the coil of the relay module 111 is connected to the first direct-current power supply, the coil of the relay module 111 is electrified, and then the contact of the relay module 111 acts, so that the normally open contact of the relay module 111 is closed, the normally closed contact is opened, and the normally open contact is connected with the common contact; if the first switch module 112 is turned off, the coil of the relay module 111 is not connected to the first dc power supply, and the coil of the relay module 111 is not energized, so that the contact of the relay module 111 does not move, the normally open contact of the relay module 111 is opened, the normally closed contact is closed, and the normally closed contact is connected to the common contact. Therefore, the first switch module 112 may control whether the coil of the relay module 111 is energized, and further, whether the contact of the relay module 111 is operated, thereby controlling the direction of the current flowing through the coil of the contactor.

Specifically, the common contact of relay module 111 includes first common contact and second common contact, the normally open contact of relay module 111 includes first normally open contact and second normally open contact, the normally closed contact of relay module 111 includes first normally closed contact and second normally closed contact, the one end of the coil of first common contact and contactor, the other end of the coil of second common contact and contactor is connected, first normally closed contact and first normally open contact are equallyd divide and are connected with second DC power supply's negative pole respectively, second normally closed contact and second normally open contact are equallyd divide and are connected with second DC power supply's positive pole respectively.

The first switch module 112 includes a transistor QR, a base of which is used to receive a corresponding control signal, a collector of which is connected to the coil of the relay module 111, and an emitter of which is grounded.

If the current direction control circuit 11 is n paths, the n paths of current direction control circuit 11 includes n relay modules 111, which are relays K1, K2, and K3 … Kn, and further includes triodes QR1, QR2, and QR3 … QRn that control actions of relay contacts, control signals corresponding to the triodes QR are DO1, DO2, and DO3 … DOn, the control signals control the corresponding triodes QR to be turned on or off, and each relay module 111 corresponds to one triode QR.

Taking the first path of current direction control circuit 11 as an example, in the embodiment of the present invention, the voltage of the first dc power supply is VCC, the voltage of the second dc power supply is +48V, pin 1 of the relay module 111 is connected to the positive electrode VCC of the first dc power supply, pin 8 is connected to the collector of the triode QR1, the first common contact of the relay module 111 is pin 3, the second common contact is pin 6, the first normally open contact is pin 4, the second normally open contact is pin 5, the first normally closed contact is pin 2, and the second normally closed contact is pin 7, where pin 3 and pin 6 are respectively connected to the a end and the B end of the contactor coil, pin 4 and pin 7 are respectively connected to the positive electrode 48V + of the second dc power supply, and pin 2 and pin 5 are respectively connected to the negative electrode COM of the second dc power supply. The transistor QR1 is controlled to be turned on or off by a control signal DO1 corresponding to the transistor QR 1.

In a default state, the control signal DO1 is a low level signal, the transistor QR1 is turned off, the coil of the relay module 111 is not powered on, the pins 2 and 3 of the relay module 111 are connected, and the pins 6 and 7 of the relay module 111 are connected, so that the direction of current flowing through the coil of the contactor is 48V + → B → a → COM, the contactor is controlled to be powered on, and the load 200 is controlled to be powered on;

if the control signal DO1 is a high level signal, the transistor QR1 is turned on, the coil of the relay module 111 is connected to the first dc power supply, the coil is powered on, the contact of the relay module 111 acts, the pin 3 and the pin 4 of the relay module 111 are connected, and the pin 5 and the pin 6 of the relay module 111 are connected, so that the current flowing through the coil of the contactor is in a direction of 48V + → a → B → COM, the contactor is controlled to be powered off, and the load 200 is controlled to be powered off.

Therefore, the current direction control circuit 11 controls the on/off of the transistor QR by the control signal, and further controls whether the contact of the relay module 111 is operated, thereby controlling the direction of the current flowing through the coil of the contactor to control the power-on/power-off of the contactor.

Referring to fig. 4, the through-current time control circuit 12 includes an isolation module 121 and a second switch module 122, a first end of the isolation module 121 is connected to a positive electrode of the first dc power supply, a second end of the isolation module 121 is configured to receive a corresponding control signal, a third end of the isolation module 121 is connected to a control end of the second switch module 122, a fourth end of the isolation module 121 is connected to a positive electrode of the second dc power supply, and the isolation module 121 is configured to isolate a connection state of the second dc power supply and the control end of the second switch module 122, so as to control a working state of the second switch module 122.

The input end of the second switch module 122 is connected to the positive pole of the third dc power supply, the output end of the second switch module 122 is connected to the negative pole of the third dc power supply, the input end of the second switch module 122 and the output end of the second switch module 122 are connected in series to the working circuit of the contactor coil, and the second switch module 122 is used for controlling the current time flowing through the contactor coil.

As shown in fig. 4, in the embodiment of the present invention, the voltage of the first dc power supply is VCC, the voltage of the second dc power supply is +48V, and the voltage of the third dc power supply is-48V. The isolation module 121 includes isolation optocoupler U1, and the first end of isolation optocoupler U1 is connected with the anodal VCC of first DC power supply, and the second end of isolation optocoupler U1 is used for receiving the control signal who corresponds, and the third end of isolation optocoupler U1 is connected with the control end of second switch module 122, and the fourth end of isolation optocoupler U1 is connected with anodal 48V + of second DC power supply.

The second switch module 122 includes a MOS transistor Q, the MOS transistor Q is an NMOS transistor Q, a gate of the MOS transistor Q is connected to the third end of the isolation module 121, a drain of the MOS transistor Q is connected to the positive pole COM of the third dc power supply, a source of the MOS transistor Q is connected to the negative pole 48V-of the third dc power supply, and the drain of the MOS transistor Q and the source of the MOS transistor Q are connected in series to the working loop of the contactor coil.

A control signal of the isolation optocoupler U1 is a pulse signal PLUS, when the pulse signal PLUS is a low level signal, a photodiode in the isolation optocoupler U1 is conducted, so that a phototriode in the isolation optocoupler U1 is conducted, a gate of an MOS (metal oxide semiconductor) tube Q is at a high level, the MOS tube Q is conducted, so that a working circuit of a contactor coil is in a closed circuit state, and the contactor coil flows in current; when the pulse signal PLUS is a high-level signal, the photodiode in the isolation optocoupler U1 is cut off, so that the phototransistor in the isolation optocoupler U1 is cut off, the 48V-of the third direct-current power supply is connected to the grid of the MOS transistor Q, the grid of the MOS transistor Q is at a low level, the MOS transistor Q is cut off, and then the working circuit of the contactor coil is in an open circuit state, and the contactor coil does not flow in current. Therefore, the current time control circuit 12 controls the conduction of the MOS transistor Q by controlling the pulse width of the pulse signal PLUS, thereby controlling the current time of the contactor coil.

Referring to fig. 5, fig. 5 is a schematic circuit structure diagram of the multi-path power-on/power-off control circuit 10, as shown in fig. 5, taking the nth power-on/power-off control circuit as An example, two ends of the coil of the contactor KM are An end and a Bn end, respectively, An anode 48V + of the second dc power source is connected to the An end or the Bn end of the coil of the contactor KM, and the other end of the coil of the contactor KM is connected to a cathode COM of the second dc power source, as follows: if the positive electrode 48V + of the second dc power supply is connected to the An end of the coil of the contactor KM, the Bn end of the coil of the contactor KM is connected to the negative electrode COM of the second dc power supply, and if the positive electrode 48V + of the second dc power supply is connected to the Bn end of the coil of the contactor KM, the An end of the coil of the contactor KM is connected to the negative electrode COM of the second dc power supply. The negative pole COM of the second dc power supply is also the positive pole of the third dc power supply, and therefore, COM is also connected to the drain of the MOS transistor Q, and the source of the MOS transistor Q is connected to the negative pole 48V-of the third dc power supply. In some embodiments, the second dc power supply and the third dc power supply may be implemented by one power supply with a positive electrode of 48V +, a negative electrode of 48V ", and a common terminal of COM.

The operation of the multi-path power-up/power-down control circuit 10 can be described as follows: firstly, the on/off of the transistor QRn is controlled by a control signal DOn, and then the direction of current flowing through the coil of the contactor KM is controlled, specifically, in a default state, the control signal DOn is a low level signal, the transistor QRn is turned off, the coil of the relay Kn is not electrified, the 2 pin and the 3 pin of the relay Kn are connected, the 6 pin and the 7 pin of the relay Kn are connected, if the isolation optocoupler U1 is controlled to be conducted by a pulse signal PLUS at the same time, and then the MOS transistor Q is conducted, then the working circuit of the coil of the contactor KM is in a closed state, and the direction of current flowing through the coil of the contactor KM is 48V + → Bn → An → COM, the contactor KM is controlled to be powered, and then the load 200 is controlled to be powered, and if the isolation optocoupler U1 is controlled to be disconnected by a pulse signal PLUS, and then the MOS transistor Q is turned off, then the working circuit of the coil of the contactor KM is in An open state, the through-flow time of the coil of the contactor KM is controlled;

if the control signal DOn is a high-level signal, the triode QRn is conducted, the coil of the relay Kn is connected with the first direct-current power supply, the coil is electrified, the contact of the relay Kn acts, the pin 3 and the pin 4 of the relay Kn are connected, the pin 5 and the pin 6 of the relay Kn are connected, if the isolation optocoupler U1 is controlled to be conducted through the pulse signal PLUS at the same time, the MOS transistor Q is further conducted, then the working loop of the coil of the contactor KM is in a closed state, then the current direction flowing through the coil of the contactor KM is 48V + → An → Bn → COM, the contactor KM is controlled to be powered off, and then the load 200 is controlled to be powered off.

In summary, compared with the conventional circuit in which each circuit of the contactor needs to pass through one circuit of the through-current time control circuit, the multi-circuit power-on/power-off control circuit only needs to control the multi-circuit contactor through one circuit of the through-current time control circuit, so that the circuit structure is simple, and the circuit cost is reduced.

It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention and to provide a more thorough understanding of the present disclosure. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.

Claims (9)

1. A multi-path power-up/power-down control circuit for use with a multi-path power-up/power-down electrical contactor, the multi-path power-up/power-down control circuit comprising: at least one path of current direction control circuit and current time control circuit;

each path of the through-flow direction control circuit is electrically connected with a coil of the contactor respectively, the through-flow direction control circuits correspond to the contactors one by one, and the through-flow direction control circuits are used for controlling the direction of current flowing through the coils of the contactors so as to control the power-on/power-off of the contactors;

the coils of all the contactors are electrically connected with the through-current time control circuit, and the through-current time control circuit is used for controlling the current time flowing through the coils of the contactors;

the current-flowing time control circuit comprises an isolation module and a second switch module, wherein a first end of the isolation module is connected with the anode of a first direct-current power supply, a second end of the isolation module is used for receiving a corresponding control signal, a third end of the isolation module is connected with the control end of the second switch module, a fourth end of the isolation module is connected with the anode of a second direct-current power supply, and the isolation module is used for isolating the connection state of the second direct-current power supply and the control end of the second switch module so as to control the working state of the second switch module;

the input of second switch module is connected with third DC power supply's positive pole, the output of second switch module with third DC power supply's negative pole is connected, just, the input of second switch module with the output of second switch module establish ties in the work circuit of contactor coil, the second switch module is used for control to flow through the current time of contactor coil.

2. The multi-path power-on/power-off control circuit according to claim 1, wherein each of the current direction control circuits comprises a relay module and a first switch module, a coil of the relay module is electrically connected to a positive electrode of a first dc power supply and an input terminal of the first switch module, respectively, a common contact of the relay module is electrically connected to a coil of the contactor, a normally open contact and a normally closed contact of the relay module are electrically connected to a positive electrode of a second dc power supply and a negative electrode of the second dc power supply, respectively, and the relay module is configured to control a current direction of the coil of the contactor;

the control end of the first switch module is used for receiving corresponding control signals, the output end of the first switch module is grounded, and the first switch module is used for controlling the contact action of the relay module.

3. The multi-path power-on/power-off control circuit according to claim 2, wherein the common contacts of the relay module include a first common contact and a second common contact, the normally open contacts of the relay module include a first normally open contact and a second normally open contact, the normally closed contacts of the relay module include a first normally closed contact and a second normally closed contact, the first common contact is connected to one end of the coil of the contactor, the second common contact is connected to the other end of the coil of the contactor, the first normally closed contact and the first normally open contact are connected to a negative electrode of the second dc power supply, and the second normally closed contact and the second normally open contact are connected to a positive electrode of the second dc power supply.

4. The multi-channel power-on/power-off control circuit of claim 2, wherein the first switching module comprises a transistor, a base of the transistor is configured to receive the corresponding control signal, a collector of the transistor is coupled to the coil of the relay module, and an emitter of the transistor is grounded.

5. The multi-path power-on/power-off control circuit according to claim 1, wherein the isolation module comprises an isolation optocoupler, a first end of the isolation optocoupler is connected to an anode of the first dc power supply, a second end of the isolation optocoupler is configured to receive a corresponding control signal, a third end of the isolation optocoupler is connected to a control end of the second switch module, and a fourth end of the isolation optocoupler is connected to an anode of the second dc power supply.

6. The multi-path power-on/power-off control circuit according to claim 1, wherein the second switch module comprises a MOS transistor, a gate of the MOS transistor is connected to the third end of the isolation module, a drain of the MOS transistor is connected to a positive electrode of the third dc power supply, a source of the MOS transistor is connected to a negative electrode of the third dc power supply, and the drain of the MOS transistor and the source of the MOS transistor are connected in series to a working loop of the contactor coil.

7. The multi-path power on/off control circuit according to any one of claims 1 or 5-6, wherein a negative pole of the first DC power source, a negative pole of the second DC power source, and a positive pole of the third DC power source are the same terminal.

8. The multi-path power-on/power-off control circuit according to any one of claims 1 to 6, further comprising a protection circuit, wherein the protection circuit is electrically connected to the through-current time control circuit and each of the through-current direction control circuits, respectively, and is configured to perform reliable on-off protection on the through-current time control circuit and perform follow-current protection on each of the through-current direction control circuits.

9. A communication power supply system, comprising: a multi-path power-on/power-off control circuit and power-on/power-off electrical contactor as claimed in any one of claims 1 to 8;

the multi-path power-on/power-off control circuit is electrically connected with the coil of the contactor and is used for controlling the current direction flowing through the coil of the contactor and the current time flowing through the coil of the contactor;

the contactor is used for controlling the power-on/power-off of the load.

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