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CN-121979017-A - Control system, method and electric device for controlling forward and reverse power supply and communication of power supply

CN121979017ACN 121979017 ACN121979017 ACN 121979017ACN-121979017-A

Abstract

The application relates to a control system, a control method and an electric device for controlling positive and negative power supply and communication of a power supply, which comprises a main board and at least one driving board, wherein the main board and the driving board are connected through two-core buses comprising a positive power line and a negative power line, the main board comprises a relay switching circuit and a main controller, the power supply polarity of the two-core buses is switched through controlling the on-off state of the relay switching circuit to form a positive power supply state or a reverse power supply state, communication data are encoded and output through controlling the on duration of the relay switching circuit, the driving board comprises a rectifier bridge circuit, a signal detection circuit and a slave controller, direct current with constant polarity can be output to the electric device for supplying power to the driving board, communication signals from the main board in the two-core buses are collected, the level state of the communication signals output by the signal detection circuit is identified, corresponding signal receiving ends are selected according to the level state, and corresponding control operation is executed.

Inventors

  • HE SHAOLIN
  • HUANG QIANG

Assignees

  • 杭州通翎科技有限公司

Dates

Publication Date
20260505
Application Date
20251217

Claims (10)

  1. 1. A control system for controlling positive and negative power supply and communication of a power supply is characterized by comprising a main board and at least one driving board, wherein the main board is connected with the driving board through a two-core bus comprising a positive power line and a negative power line, The main board comprises: the input end of the relay switching circuit is connected with the main controller, and the output end of the relay switching circuit is connected to the driving board through the two-core bus; The main controller is used for switching the power supply polarity of the two-core buses by controlling the on-off state of the relay switching circuit so as to form a forward power supply state or a reverse power supply state, and encoding and outputting communication data by controlling the on duration of the relay switching circuit; the driving plate includes: The input end of the rectifier bridge circuit is connected with the two-core bus, the output end of the rectifier bridge circuit is connected with a driven motor, and the rectifier bridge circuit is used for outputting direct current with constant polarity to the motor; the signal detection circuit is characterized in that a first input end of the signal detection circuit is connected with the positive power line, a first output end of the signal detection circuit is connected with a first signal received from the controller, a second input end of the signal detection circuit is connected with the negative power line, a second output end of the signal detection circuit is connected with a second signal received from the controller, and the signal detection circuit is used for collecting level signals of the two-core buses; The slave controller is used for identifying the power supply state of the two-core bus according to the level signal, selecting a first signal receiving end or a second signal receiving end according to the power supply state to receive the communication data, and executing corresponding control operation.
  2. 2. The system of claim 1, wherein the relay switching circuit comprises a first relay control circuit and a second relay control circuit, wherein an input of the first relay control circuit is connected to a first signal output terminal and an output of the main controller is connected to a first terminal of the positive power line, an input of the second relay control circuit is connected to a second signal output terminal and an output of the second relay control circuit is connected to a first terminal of the negative power line, The main controller is configured to generate a first power supply waveform on the positive power supply line and a second power supply waveform on the negative power supply line by controlling on-off time sequences of the first relay control circuit and the second relay control circuit, and pulse widths of the first power supply waveform and the second power supply waveform are different and high-level periods are not overlapped; The high level period of the first power supply waveform is in a forward power supply state for providing power, and the high level period of the second power supply waveform is in a reverse power supply state and is modulated in duration to represent a communication data bit.
  3. 3. The system of claim 2, wherein the communication data bits are encoded in the following manner: The pulse width of the second power supply waveform is a binary 0 when the pulse width is a first duration, and the pulse width of the second power supply waveform is a binary 1 when the pulse width is a second duration, wherein the duration of the first duration is different from the duration of the second duration.
  4. 4. The system of claim 2, wherein a frame header signal consisting of a forward power state and a reverse power state of a specific duration is transmitted for communication synchronization prior to transmitting the communication data bits.
  5. 5. The system of claim 2, wherein the first relay control circuit comprises a first switch module and a first relay module, and the second relay control circuit comprises a second switch module and a second relay module, wherein, The input end of the first switch module is connected with a first signal output end of the main controller, the output end of the first switch module is connected with a coil contact of the first relay module, a normally closed contact of the first relay module is connected with a negative input voltage, a normally open contact of the first relay module is connected with a positive input voltage, and the output end of the first relay module is connected with the positive power line; The input end of the second switch module is connected with the second signal output end of the main controller, the output end of the second switch module is connected with the coil contact of the second relay module, the normally closed contact of the second relay module is connected with negative input voltage, the normally open contact of the second relay module is connected with positive input voltage, and the output end of the second relay module is connected with the negative power line.
  6. 6. The system of claim 5, wherein the relay switching circuit further comprises a first freewheeling diode, a second freewheeling diode, a first transient suppression diode, and a second transient suppression diode, wherein, The first freewheeling diode is connected in parallel with the coil of the first relay module, the second freewheeling diode is connected in parallel with the coil of the second relay module, and the first freewheeling diode and the second freewheeling diode are used for providing a release path for current in the coil and clamping the voltage of the release path on a preset voltage; the positive pole of the first transient suppression diode is connected with the normally closed contacts of the two relay modules, the negative pole of the first transient suppression diode is connected with the normally open contacts of the two relay modules, and the positive pole of the second transient suppression diode is connected with the output end of the second relay module, and the negative pole of the second transient suppression diode is connected with the output end of the first relay module.
  7. 7. The system of claim 2, wherein the signal detection circuit comprises a first divided sampling branch and a second divided sampling branch, wherein, The input end of the second voltage division sampling circuit is connected with the second end of the positive power line, and the output end of the second voltage division sampling circuit is connected with the second signal receiving end of the slave controller; The slave controller is used for carrying out level state identification on the communication signals output by the two signal receiving ends, and the signal receiving end with the low level state is selected to receive the communication data from the main board.
  8. 8. The system of claim 7, wherein the signal detection circuit further comprises a filtering circuit, wherein, The input end of the filter circuit is connected with the output end of the rectifier bridge circuit, and the output end of the filter circuit is connected with the motor and used for noise filtering of the electric signals output by the rectifier bridge circuit.
  9. 9. A control method for controlling power supply positive and negative power supply and communication, which is applied to a control system for controlling power supply positive and negative power supply and communication according to any one of claims 1-8, and is characterized in that the method comprises the following steps: At the main board end, the power supply polarity of the two-core buses is switched by controlling the on-off of a relay through a main controller so as to form a forward power supply state or a reverse power supply state, and communication data are encoded and output by controlling the duration of the on-state of the relay; And at the drive board end, the nonpolar power supply is realized through the rectifier bridge circuit, the level signals of the two-core buses are collected through the signal detection circuit, the power supply state of the two-core buses is identified according to the level signals from the controller, the corresponding signal receiving end is selected according to the power supply state to receive the communication data, and corresponding control operation is executed.
  10. 10. An electric device is characterized by comprising an upper computer, a driving motor and the control system for controlling the positive and negative power supply and communication of the power supply according to any one of claims 1-8, The upper computer is connected with a main controller in the main board, and the driving motor is connected with a slave controller of the driving board; The master controller is configured to receive a control instruction issued by the upper computer and issue communication data to the slave controller according to the control instruction; the slave controller is configured to control the forward rotation, the reverse rotation or the stop of the corresponding driving motor according to the received communication data.

Description

Control system, method and electric device for controlling forward and reverse power supply and communication of power supply Technical Field The application relates to the technical field of control of electric devices, in particular to a control system, a control method and an electric device for controlling positive and negative power supply and communication of a power supply. Background In the control system of an electric device (such as a fire-fighting electric window opener) in the fields of fire protection, intelligent home and the like, in order to reduce wiring cost and complexity, two-core buses are widely adopted for power supply and control, one is positive in power supply, the other is negative in power supply, and reference is made to fig. 1. Therefore, in the conventional control manner, the main controller switches the voltage polarities on the buses (bus+ and BUS-) by controlling the relays, so as to realize the power supply control of the terminal driving board. The driving board controls the forward rotation and the reverse rotation of the motor by recognizing the power supply direction (forward direction or reverse direction), thereby performing basic actions such as opening and closing the window. However, the control mode which only depends on the polarity of the power supply has single function, can only realize that all devices accessing the bus synchronously execute the full-on or full-off operation, cannot control specific devices on the bus singly or in groups, and greatly limits the flexibility and the intelligent degree of the system. To further enhance system functionality, attempts to superimpose communication signals on a power line, such as power line carrier communication techniques, are currently in existence. However, such schemes are generally complicated in circuit and high in cost, and communication reliability is difficult to guarantee under the interference caused by start-stop of high-power equipment such as motors. In addition, the existing system requires strict distinction of the positive and negative poles of the bus during wiring, if the bus is reversely connected during construction by workers, equipment cannot work normally, and difficulty and error rate of installation and debugging are increased. Therefore, a low-cost two-wire control system capable of realizing flexible addressing communication and requiring no polarity of wiring without increasing cables and ensuring reliable power supply is needed. Disclosure of Invention The application provides a control system, a control method and an electric device for controlling positive and negative power supply and communication of a power supply, and aims to at least solve the problem that the power supply and communication control cost of the existing electric device control system in the related art is high. In a first aspect, the application provides a control system for controlling positive and negative power supply and communication of a power supply, which comprises a main board and at least one driving board, wherein the main board is connected with the driving board through a two-core bus comprising a positive power line and a negative power line, The main board comprises: the input end of the relay switching circuit is connected with the main controller, and the output end of the relay switching circuit is connected to the driving board through the two-core bus; The main controller is used for switching the power supply polarity of the two-core buses by controlling the on-off state of the relay switching circuit so as to form a forward power supply state or a reverse power supply state, and encoding and outputting communication data by controlling the on duration of the relay switching circuit; the driving plate includes: The input end of the rectifier bridge circuit is connected with the two-core bus, the output end of the rectifier bridge circuit is connected with a driven motor, and the rectifier bridge circuit is used for outputting direct current with constant polarity to the motor; the signal detection circuit is characterized in that a first input end of the signal detection circuit is connected with the positive power line, a first output end of the signal detection circuit is connected with a first signal received from the controller, a second input end of the signal detection circuit is connected with the negative power line, a second output end of the signal detection circuit is connected with a second signal received from the controller, and the signal detection circuit is used for collecting level signals of the two-core buses; The slave controller is used for identifying the power supply state of the two-core bus according to the level signal, selecting a first signal receiving end or a second signal receiving end according to the power supply state to receive the communication data, and executing corresponding control operation. Preferably, the relay switching circuit comprises a first