CN210776649U

CN210776649U - Audio system remote control panel and audio control system based on CAN

Info

Publication number: CN210776649U
Application number: CN201921959097.3U
Authority: CN
Inventors: 曾桓平
Original assignee: Shenzhen Ezpro Electro Optic Technology Co ltd
Current assignee: Shenzhen Ezpro Electro Optic Technology Co ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-06-16
Anticipated expiration: 2029-11-13

Abstract

The utility model relates to an audio system remote control panel and audio control system based on CAN, include: the main controller is connected with the main controller, the display unit is used for displaying the operation interface, and the key unit is connected with the main controller and is used for triggering the editing state of the operation interface; the knob unit is connected with the main controller and used for selecting the editing parameters of the operation interface; the CAN interface circuit is connected with the main controller and used for connecting with external equipment. Implement the utility model has the characteristics of the response is fast and the reliability is high.

Description

Audio system remote control panel and audio control system based on CAN

Technical Field

The utility model relates to an audio control technical field, more specifically say, relate to an audio system remote control panel and audio control system based on CAN.

Background

Under the normal condition, the host equipment of the audio and video system is installed on a special frame in a machine room and is far away from the use place, and the system control is generally set in a special central control room, so that a field user cannot quickly adjust and control the working state of the host equipment, and people need a remote control panel which can be quickly operated and is convenient to install, is connected with the controlled audio and video equipment through various communication modes and is directly installed at the use place to be controlled by an AV system user.

In the traditional scheme, GPIO (General Purpose input/output) connection or RS485 bus connection is adopted between a control panel and a controlled device, but the GPIO connection is insufficient, the control function is limited, the control panel cannot obtain and display state information of the controlled device, the RS485 bus connection is adopted, because the RS485 bus connection is a half-duplex communication mode of a master-slave mode, a controlled host machine needs to communicate with a plurality of control panels In a time-sharing mode, and the reliability of data transmission and the real-time performance of control are poor.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned prior art defect of prior art, provide an audio system remote control panel and audio control system based on CAN.

The utility model provides a technical scheme that its technical problem adopted is: constructing a CAN-based audio system remote control panel comprising: a main controller, a power supply and a power supply,

a display unit connected with the main controller and used for displaying an operation interface,

the key unit is connected with the main controller and used for triggering the editing state of the operation interface;

the knob unit is connected with the main controller and is used for selecting the editing parameters of the operation interface;

the CAN interface circuit is connected with the main controller and used for connecting with external equipment.

Preferably, the CAN interface circuit includes a first connector, a second connector, a CAN transceiver connected to the main controller, a first protection circuit connected to the first connector and the CAN transceiver, and a second protection circuit connected to the second connector and the CAN transceiver.

Preferably, the first protection circuit comprises a first TVS tube D2, a second TVS tube D3, a first common-mode inductor L2, a first capacitor C12 and a second capacitor C13;

the first TVS transistor D2 is connected in parallel with the first capacitor C12, and then has one end connected to the first end of the first common mode inductor L2 and the other end grounded;

the second TVS transistor D3 and the second capacitor C13 are connected in parallel, and then one end of the second TVS transistor D3 is connected to the second end of the first common mode inductor L2, and the other end is grounded,

the third end and the fourth end of the first common-mode inductor L2 are respectively connected with the CAN transceiver; and/or

The second protection circuit comprises a third TVS tube D5, a fourth TVS tube D6, a second common-mode inductor L4, a third capacitor C21 and a fourth capacitor C22;

after the third TVS tube D5 and the third capacitor C21 are connected in parallel, one end of the third TVS tube D5 is connected to the first end of the second common-mode inductor L4, and the other end of the third TVS tube D21 is grounded;

after the fourth TVS transistor D6 and the fourth capacitor C22 are connected in parallel, one end of the fourth TVS transistor D6 is connected to the second end of the second common-mode inductor L4, and the other end of the fourth TVS transistor D22 is grounded;

and the third end and the fourth end of the second common-mode inductor L4 are respectively connected with the CAN transmitter.

Preferably, the first connector and the second connector are RJ45 interfaces respectively, and the control panel further includes an isolation circuit connected to the first connector and the second connector respectively, and a power conversion circuit connected to the isolation circuit.

Preferably, the isolation circuit comprises an isolation diode D1, the anodes of the isolation diode D1 are respectively connected to the first connector and the second connector, and the cathode of the isolation diode D1 is connected to the power conversion circuit; and/or

The power conversion circuit comprises a power conversion chip U3.

Preferably, the knob unit includes a knob without upper and lower limit rotation restrictions.

Preferably, the knob unit and the key unit are designed into a whole, and the integrally designed knob comprises a knob body with a key function and a rotary encoder connected with the knob body.

Preferably, the display unit includes an OLED display screen.

Preferably, the decoding unit includes a decoder S1, and the first pin, the third pin, the fourth pin and the sixth pin of the decoder S1 are respectively connected to the main controller.

The utility model discloses still construct an audio control system, including host computer equipment, and with host computer equipment passes through CAN bus connection's at least one control panel, control panel is above arbitrary one audio system remote control panel based on CAN.

Implement the utility model discloses an audio system remote control panel and audio control system based on CAN has following beneficial effect: the method has the characteristics of quick response and high reliability.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a logic block diagram of a remote control panel of a CAN-based audio system of the present invention;

FIGS. 2-7 are circuit schematic diagrams of an embodiment of a CAN based audio system remote control panel of the present invention; wherein

FIG. 2 is a circuit schematic of a master controller of an embodiment;

FIG. 3 is a circuit schematic of a CAN interface circuit of an embodiment;

FIG. 4 is a circuit schematic of a power conversion circuit of an embodiment;

FIG. 5 is a schematic circuit diagram of a key unit and a knob unit according to an embodiment;

FIG. 6 is a circuit schematic of a display unit of an embodiment;

FIG. 7 is a circuit schematic of a decode unit of an embodiment;

fig. 8 is a schematic structural diagram of an embodiment of an audio control system according to the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in a first embodiment of a CAN-based audio system remote control panel 100 of the present invention, the present invention includes: the main controller 110 is connected with the main controller 110, the display unit 150 for displaying an operation interface, and the key unit 170 connected with the main controller 110 for triggering the editing state of the operation interface; a knob unit 160 connected to the main controller 110 for selecting an edit parameter of the operation interface; a decoding unit 140 connected to the main controller 110 for setting the coded ID of the control panel 100, and a CAN interface circuit 130 connected to the main controller 110 for connecting to an external device. Specifically, the remote control panel 100 includes a CAN interface circuit 130, which is connected to an upper or lower device through the CAN interface circuit 130. When the superior device is the host device, the connection CAN be performed based on the CAN bus, and the CAN data transmitted by the bus in a fixed format is adopted. The remote control panel 100 is provided with a decoding unit 140, the decoding unit 140 is the hardware code ID of the remote control panel 100, when the remote control panel 100 accesses the CAN BUS, the remote control panel 100 first sends a registration request to the host device and obtains the current operating parameter information of the host device, and the hardware code ID is carried by the parameter instruction when sending the registration request and obtaining the current operating parameter of the device. After receiving the request of the remote control panel 100, the host device adds the information of the remote control panel 100 to the queue of registered devices, and then sends the real-time runtime parameters, which can be adjusted by the remote control panel 100, of the host device to the corresponding remote control panel 100 according to the hardware code ID. The host device will periodically query whether the registered remote control panel 100 devices are offline. After the data acquisition process is completed, the remote control panel 100 may begin sending control commands to the host device and receiving feedback command information from the host device, and other parameter information for changing the host device may be broadcast by the host device via the CAN BUS to each remote control panel 100. Since the factory default menu control entry of the remote control panel 100 is empty, only the menu control entry is downloaded to send a control command to the control host device. The menu control item is edited and made by PC upper computer software, and is downloaded to the remote control panel 100 of the appointed hardware code ID by the host device sending the control item setting instruction, and then the remote control panel 100 saves the menu control item parameter on the local memory. The menu control items of the remote control panel 100 can be edited and made on site through the software of the PC upper computer according to actual needs and downloaded to the control panel 100 on line to complete the setting process. Wherein the display unit 150 of the remote control panel 100 displays a main interface in a non-operation condition, and the interface only has the name and hardware code ID number of the current control panel 100 and can also display the most commonly used control item information. In still other embodiments, the display unit 150 may display a name of a currently operated menu and parameters corresponding to the menu. The operation control function of the remote control panel 100 starts from the knob, the knob rotates left or right, leaves the main interface, and is converted into a menu control browsing interface, 32 menu items can circularly switch browsing pages by clockwise or counterclockwise rotating the knob, the display unit 150 displays the currently switched menu control interface in real time, the current control menu parameter editing state can be entered by pressing a key, the parameter variable is changed by clockwise or counterclockwise rotating the knob, and the change condition of the parameter is displayed by the display unit 150 in real time. Some parameters will take effect in real time, such as volume control adjustment, and others will take effect only after the knob is pressed again for confirmation, such as scene switching. And if the key is pressed again, the parameter editing state is exited, the control menu is returned for browsing, and the parameter change is determined to be effective when the key is pressed again corresponding to the parameter control which is not effective in real time. The main controller 110 will send the corresponding control command to the host device end through the CAN BUS when the parameter change is determined to be effective in the process of knob or key operation.

As shown in fig. 2 and 3, in one embodiment, the CAN interface circuit 130 includes a first connector 1311, a second connector 1312, a CAN transceiver 133 coupled to the host controller 110, a first guard circuit 1321 coupled to the first connector 1311 and the CAN transceiver 133, and a second guard circuit 1322 coupled to the second connector 1312 and the CAN transceiver 133. Specifically, the CAN interface circuit 130 may be connected to an upper level or a lower level device through the first connector 1311 or the second connector 1312, respectively, for example, the host device may be connected to the first connector 1311, and the control panel 100 of the lower level may be connected to the second connector 1312. The first protection circuit 1321 and the second protection circuit 1322 respectively protect signals of the first connector 1311 and the second connector 1312 to prevent electromagnetic interference or damage to a subsequent circuit, and the signals processed by the protection circuit may enter the CAN transceiver 133 for signal processing to output a signal level meeting a requirement and enter the main controller 110 for signal interpretation. The signals are understood here to be CAN data signals. The main controller 110 may be based on a widely used base

The STM32F103 series microcontroller of the M332-bit RISC core has the advantages of wide working temperature range, low power consumption, high reliability, more peripheral serial interfaces, no need of additional expansion and higher cost performance. The CAN BUS communication interface of the microcontroller CAN conveniently realize the connection of a plurality of control panels 100 with the controlled host equipment. The CAN transceiver 133 may employ the SN65HVD230 series.

In one embodiment, the first protection circuit 1321 includes a first TVS transistor D2, a second TVS transistor D3, a first common mode inductor L2, a first capacitor C12, and a second capacitor C13; the first TVS transistor D2 is connected in parallel with the first capacitor C12, and then has one end connected to the first end of the first common mode inductor L2 and the other end grounded; after the second TVS tube D3 and the second capacitor C13 are connected in parallel, one end of the second TVS tube D3 is connected to the second end of the first common-mode inductor L2, the other end of the second TVS tube D13 is grounded, and the third end and the fourth end of the first common-mode inductor L2 are respectively connected to the CAN transceiver 133; specifically, in the protection circuit, surge voltage entering from the line interface is suppressed through the TVS tube D1 and the TVS tube D3 to protect the CAN transceiver 133, and the common-mode inductor L2 realizes EMI electromagnetic filtering of CAN data signals.

In another embodiment, the second protection circuit 1322 includes a third TVS transistor D5, a fourth TVS transistor D6, a second common mode inductor L4, a third capacitor C21 and a fourth capacitor C22; the third TVS tube D5 and the third capacitor C21 are connected in parallel, and then one end of the third TVS tube D5 is connected to the first end of the second common-mode inductor L4, and the other end of the third TVS tube D21 is grounded; the fourth TVS tube D6D6 and the fourth capacitor C22 are connected in parallel, and then one end of the fourth TVS tube is connected to the second end of the second common-mode inductor L4, and the other end of the fourth TVS tube is grounded; and the third end and the fourth end of the second common-mode inductor L4 are respectively connected with a CAN transmitter. Specifically, in the protection circuit, surge voltage entering from the line interface is suppressed through the TVS tube D5 and the TVS tube D6 to protect the CAN transceiver 133, and the common-mode inductor L4 realizes EMI electromagnetic filtering of CAN data signals.

In one embodiment, the first connector 1311 and the second connector 1312 are RJ45 interfaces, respectively, and the control panel 100 further includes an isolation circuit connected to the first connector 1311 and the second connector 1312, respectively, and a power conversion circuit connected to the isolation circuit. Specifically, the first connector 1311 and the second connector 1312 used for connecting the upper and lower-level devices may adopt RJ45 interfaces, such as RJ45 interface J1 and RJ45 interface J2, through which power transmission may be performed when transmitting CAN data signals, and an isolation circuit may be provided to prevent reverse connection of power polarity and power backflow, and the power conversion circuit is turned on to convert power input to obtain the operating voltage and current required by the control panel 100.

In one embodiment, the isolation circuit includes an isolation diode D1, the anode of the isolation diode D1 is connected to the first connector 1311 and the second connector 1312, respectively, and the cathode of the isolation diode D1 is connected to the power conversion circuit; specifically, reverse isolation of the power input may be achieved by the isolation diode D1 to prevent the power input from flowing backward.

As shown in fig. 4, in one embodiment, the power conversion circuit includes a power conversion chip U3. The power conversion circuit uses the power conversion chip U3 to realize the conversion from 12V power input to 3.3V power output, so as to provide voltage and current for the internal operation of the control panel 100 such as the main controller 110.

In one embodiment, the knob unit 160 includes a knob without upper and lower limit rotation restrictions. The knob is a knob without upper and lower limit rotation limitation, and can trigger corresponding operation through a rotation direction and a rotation position.

As shown in fig. 5, in one embodiment, the knob unit 160 and the key unit 170 are an integrally designed knob including a knob body with a key function and a rotary encoder connected to the knob body. Specifically, an integrated design knob with functions of a waiting knob and a key can be adopted, the rotary encoder connected with the knob body can be triggered through the knob body, corresponding signal triggering is achieved, the knob encoder is an incremental rotary encoder SW1, the process of the knob triggering adopts the existing common means, and the details are not repeated here.

As shown in fig. 6, in one embodiment, the display unit 150 includes an OLED display screen. Specifically, an OLED display screen may be used to display related information, and in other embodiments, other display screens may also be used, for example, an LCD display screen, an LED display screen, and the like.

As shown in FIG. 7, in one embodiment, the decoding unit 140 includes a decoder S1, and a first pin, a third pin, a fourth pin and a sixth pin of the decoder S1 are respectively connected to the main controller 110. Specifically, the decoding unit 140 for setting the hardware code ID may be an 8421BCD 4-bit decoder S1, and 4 pins (1, 3, 4, 6 pins) on the decoder S1 correspond to 4 digits (1, 4, 2, 8 pins at high level and 0, 0, 0, 0 pins at low level) to add up to obtain an ID value (the value of the 4-bit encoder is 0 to 15).

In addition, as shown in fig. 8, the utility model discloses an audio control system, including host computer equipment 200 to and pass through at least one control panel 100 of CAN bus connection with host computer equipment 200, control panel 100 is the audio system remote control panel 100 based on CAN of any one above. Specifically, the remote control panel 100 connects the host device to be controlled through the CAN BUS interface, and the CAN transceiver module transmits data such as device control commands and status information to control the host device. A host device may connect multiple remote control panels 100 and the remote control panels 100 may be cascaded in multiple daisy-chain fashion.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A CAN-based audio system remote control panel, comprising: a main controller, a power supply and a power supply,

2. The CAN-based audio system remote control panel of claim 1 wherein the CAN interface circuitry comprises a first connector, a second connector, a CAN transceiver connected to the host controller, a first protection circuit connecting the first connector and the CAN transceiver, and a second protection circuit connecting the second connector and the CAN transceiver.

3. The CAN-based audio system remote control panel of claim 2, wherein the first protection circuit comprises a first TVS transistor D2, a second TVS transistor D3, a first common mode inductor L2, a first capacitor C12, and a second capacitor C13;

4. The CAN-based audio system remote control panel of claim 2, wherein the first connector and the second connector are RJ45 interfaces, respectively, the control panel further comprising an isolation circuit connected to the first connector and the second connector, respectively, and a power conversion circuit connected to the isolation circuit.

5. The CAN-based audio system remote control panel of claim 4, wherein the isolation circuit comprises an isolation diode D1, the anode of the isolation diode D1 is connected to the first connector and the second connector, respectively, and the cathode of the isolation diode D1 is connected to the power conversion circuit; and/or

The power conversion circuit comprises a power conversion chip U3.

6. The CAN-based audio system remote control panel of claim 1, wherein the knob unit comprises a knob without upper and lower limit rotation limits.

7. The CAN-based audio system remote control panel of claim 6, wherein the knob unit and the key unit are an integrally designed knob including a knob body with a key function and a rotary encoder connected to the knob body.

8. The CAN-based audio system remote control panel of claim 1, wherein the display unit comprises an OLED display screen.

9. The CAN-based audio system remote control panel of claim 1, wherein the decoding unit comprises a decoder S1, and the first pin, the third pin, the fourth pin and the sixth pin of the decoder S1 are respectively connected to the main controller.

10. An audio control system comprising a host device and at least one control panel connected to the host device via a CAN bus, the control panel being a CAN-based audio system remote control panel according to any one of claims 1 to 9.