CN204481575U - A kind of remote power feeding control system - Google Patents

Abstract

The utility model provides a remote power supply control system, which includes a power-off switch, a power supply switch, a relay, an AC-DC module, and a remote controlled device switch; the power-off switch, the power supply switch, the relay, and the AC-DC module are located at the local end, The switch of the remote controlled device is located at the remote end; the AC-DC module provides DC power, and the relay is a DC electromagnetic relay; when the power supply switch operates, the DC power is connected; when the power-off switch operates, the DC power is disconnected; In the "ON state", the DC power supply is connected; when the switch of the remote controlled device is in the "OFF" state, the DC power supply cannot be connected; the action of the relay contact is realized by the power supply of the control coil. The utility model can realize the method of using a small current switch to control a high-power power supply; when the remote controlled device switch arranged in the remote is in the "off" state, the power supply cannot be connected no matter what operation is performed, and the remote control terminal staff provides a safe way of working.

Description

A remote power supply control system

technical field

The utility model relates to the field of power transmission and transformation, in particular to an electrical system for controlling large currents with small currents, which is suitable for various application fields requiring remote control of strong currents.

Background technique

Commonly used power supply control systems generally adopt the following two methods. One is to use a high-power switch to directly connect to the power supply system. Arc breakdown is a hidden danger to equipment safety and personnel safety. Another way to provide remote power is to control relay coil energization by turning on or off a single external switch, but this method also has the following disadvantages:

1. There is only a single external switch in the relay control circuit. The on or off state of a single switch must be triggered by an external force. If there is no external force trigger, in some cases of power supply jumps, the device will suddenly lose power. When the power supply is restored, The device is automatically powered on again, and so repeatedly, it is impossible to reliably power off the device, which poses a safety hazard;

2. In some cases, the operator needs to work at the remote device, but the remote device cannot power off the device. In this mode of operation, if the device is still powered on, the device may cause the operator to manually Personal safety hazard.

Utility model content

Aiming at the shortcomings of the above remote power supply control system, the utility model designs a power supply control system composed of multiple sets of switches, relays and AC-DC modules. The equipment can be powered off reliably, and the operator of the remote equipment can power off the equipment as needed to ensure their own safety.

The technical solution provided by the utility model is: a remote power supply control system, which is used to control the power supply of remote controlled equipment at the local end, and is characterized in that the remote power supply control system includes a power-off switch, a power supply switch, a relay, AC-DC module, remote controlled equipment switch, the power-off switch is connected in series with the power supply switch and installed at the local end, the power supply switch is connected in parallel with the normally open contact A of the relay, and the remote controlled The controlled device switch is connected in series with the relay coil of the relay and the power supply switch, and the remote controlled device switch is installed at the remote controlled device, and the AC-DC module is used to provide direct current for the relay coil, The power input line for supplying power to the controlled equipment supplies power to the controlled equipment through the normally open contacts B and C of the relay.

Further, the power-off switch is a non-self-locking switch, and the default state is the on state. After the power-off switch is pressed, it is in an instant off state. Once the external force is lost, the power-off switch automatically returns to the on state. pass status.

Furthermore, the power supply switch is a non-self-locking switch, and the default state is the off state. After the power supply switch is pressed, it is in the instantaneous on state. Once the external force is lost, the power supply switch automatically returns to the off state.

Further, the relay is a DC electromagnetic relay, including multiple sets of contacts, and each set of contacts is in an open state by default.

Further, the AC-DC module is used to convert alternating current into direct current.

Further, the remote controlled device switch is a self-locking switch, which includes two states of on and off, and is in the on state by default.

Further, the remote controlled device and the local terminal use a common power supply input line for power supply.

It should be noted that the parallel connection between the power supply switch and the normally open contact A of the relay mentioned in the present invention means that the two terminals of the power supply switch are respectively connected to the two terminals of the normally open contact A.

The utility model can realize the use of local small current switch to control high-power power supply; when the remote controlled equipment switch distributed at the remote end is in the "off" state, the power supply cannot be connected no matter what operation is performed, which ensures the safety of the staff at the remote end .

The remarkable advantages of the utility model are:

1. Use relays to control large currents with small currents. After the relay coil is connected to a small current, the electromagnet core generates a strong attraction force, which drives the relay contact to move, and the relay contact can pass a large current, realizing the use of a small current to control a large current.

2. In some cases, the operator needs to work at the remote device end. In this mode of operation, if the whole device is still powered on, the electrification of the device may cause hidden dangers to the personal safety of the operator. After the utility model adopts the remote controlled device switch in the control circuit, the operator can cut off the power of the whole device at the remote device to ensure personal safety before starting work.

3. When using the remote control switch to realize remote power supply control, the self-locking switch on the remote control end must be in the default "on" state to power on normally to prevent misoperation.

4. The utility model cleverly sets three different types of switches in the control loop. Through the combination of these three switches, the control loop will not reset itself after a single shutdown locally, and the local and Power supply interruption can be realized remotely.

Description of drawings

Fig. 1 is a schematic block diagram of the composition of the utility model;

Fig. 2 is a logic diagram of the utility model.

The names of the reference signs in the figure are:

Power supply switch—1, power off switch—2, relay—3, AC-DC module—4, remote controlled device switch—5.

Detailed ways

In conjunction with the accompanying drawings and the utility model is further described as follows:

Fig. 1 is a structural block diagram of an embodiment of the utility model, and Fig. 2 is a logic diagram of the utility model. As shown in FIGS. 1 and 2 , in this embodiment, the remote power supply control system includes a power-off switch 1 , a power supply switch 2 , a relay 3 , an AC-DC module 4 , and a remote controlled device switch 5 .

The power-off switch 1, the power supply switch 2, the relay 3 and the AC-DC module 4 are located at the local end, and the remote controlled device switch 5 is located at the remote device. In this embodiment, EAO51.0262 is selected for the power-off switch, including one group, EAO51.0262 is selected for the power supply switch, JQ-70M/012-35 is selected for the relay, NES-15-12 is selected for the AC-DC module, and the remote controlled device The switch is EAO 14-507.025D2.

The AC-DC module converts 220V AC power into 12V DC voltage and supplies it to the relay. The relay 3 is a DC electromagnetic relay, the power-off switch 1 is a non-self-locking switch, and the default state is "ON", and the power switch 2 is a non-self-locking switch, and the default state is "OFF". A pair of normally open contacts of the relay 3 are connected in parallel with the power supply switch 2; after the power supply switch is pressed, the power supply switch 2 is in the instantaneous on state, and the DC voltage generated by the AC-DC module 4 passes through the power-off switch 1 and the power supply switch 2 , the remote controlled device switch 5 is supplied to the relay coil for power supply, and then sent to the relay coil for use. The switch of the control device forms a closed state together to ensure the continuous power supply of the relay coil. After the contacts of the BC group are closed, the input of the power supply line is provided to the remote controlled device through the relay, and the remote controlled device starts.

In the absence of other triggers, the three groups of ABC contacts remain closed, and the controlled device continues to supply power; after pressing the power-off switch 1 or disconnecting the remote controlled device switch, the circuit where the relay coil is located is disconnected, and the relay coil has no power supply. The three groups of normally open contacts of ABC are disconnected, and the power supply of the remote controlled equipment is disconnected.

In addition, when the remote device is working normally, that is, when the power supply of the relay coil is normal, if it is necessary to shut down the remote controlled device at the remote controlled device end, when the switch 5 of the remote controlled device is moved to the "off" state, the direct current When disconnected, the relay coil has no power supply, the three groups of ABC normally open contacts are disconnected, and the power supply of the remote controlled device is disconnected.

The DC voltage output by the AC-DC module needs to match the voltage of the relay coil. In this implementation, 12V DC voltage is used, and DC relays powered by other DC voltages can also be used. This change should be included in the protection scope of the present invention.

Although the above has been described in detail in conjunction with specific embodiments of the present invention, those skilled in the art should understand that the scope of the present invention is only limited by the claims, and these specific embodiments do not constitute the limitation of the protection scope of the present invention .

Claims (7)

1. A remote power supply control system, used to control the power supply of remote controlled equipment at the local end, characterized in that the remote power supply control system includes a power-off switch (1), a power supply switch (2), a relay (3 ), an AC-DC module (4), a remote controlled device switch (5), the power-off switch (1) is connected in series with the power supply switch and installed at the local end, and the power supply switch (2) is connected to the power supply switch The normally open contact A of the relay (3) is connected in parallel, the remote controlled device switch (5) is connected in series with the relay coil of the relay (3) and the power supply switch (2), and the remote controlled device The device switch (5) is installed at the remote controlled device, the AC-DC module (4) is used to provide direct current for the relay coil, and the power supply input line for the controlled device passes through the normal Open contacts B and C supply power to the controlled device. 2. The remote power supply control system according to claim 1, characterized in that, the power-off switch (1) is a non-self-locking switch, the default state is an on state, and the power-off switch (1) is pressed Afterwards, it is in an instantaneous off state, and once the external force is lost, the power-off switch (1) automatically returns to the on state. 3. The remote power supply control system according to claim 1, characterized in that, the power supply switch (2) is a non-self-locking switch, and the default state is an off state, and after the power supply switch (2) is pressed, It is in the instantaneous on state, once the external force is lost, the power supply switch (2) automatically returns to the off state. 4. The remote power supply control system according to claim 1, characterized in that, the relay (3) is a DC electromagnetic relay, comprising multiple sets of contacts, each set of contacts is in a disconnected state by default. 5. The remote power supply control system according to claim 1, characterized in that the AC-DC module (4) is used to convert alternating current into 12V direct current. 6. The remote power supply control system according to claim 1, characterized in that the remote controlled device switch (5) is a self-locking switch, including two states of on and off, and is in the on state by default. 7. The remote power supply control system according to claim 1, wherein the remote controlled device and the local terminal use a common power supply input line to supply power.