阅读说明：本技术 一种dali总线传输距离扩展控制系统 (DALI bus transmission distance extension control system ) 是由 田劲 邴艳蓉 张勇 于 2021-01-14 设计创作，主要内容包括：一种DALI总线传输距离扩展控制系统,其特征在于：包括DALI传输扩展装置、DALI传输扩展总线供电电源、DALI子系统、DALI传输扩展总线,所述DALI传输扩展装置通过DALI传输扩展总线连接DALI传输扩展总线供电电源,DALI传输扩展装置连接DALI子系统。本发明实现和使用简单,不影响DALI现有标准的传输控制层、网络层和应用层的定义。在不改变现有DALI标准接口和总线拓扑的前提下突破单一总线布线距离的限制,使得DALI照明系统可以应用在照明系统远距直线分布的场景中。(A DALI bus transmission distance extension control system is characterized in that: the DALI transmission expansion device is connected with the DALI transmission expansion bus power supply through the DALI transmission expansion bus, and the DALI transmission expansion device is connected with the DALI subsystem. The invention is simple to realize and use, and does not influence the definition of a transmission control layer, a network layer and an application layer of the existing DALI standard. The DALI lighting system breaks through the limitation of the wiring distance of a single bus on the premise of not changing the conventional DALI standard interface and bus topology, so that the DALI lighting system can be applied to the scene where the lighting system is distributed linearly at a long distance.)

1. A DALI bus transmission distance extension control system is characterized in that: the DALI transmission expansion device is connected with the DALI transmission expansion bus power supply through the DALI transmission expansion bus, and the DALI transmission expansion device is connected with the DALI subsystem.

2. The DALI bus transmission distance expansion control system as claimed in claim 1, wherein the DALI transmission expansion device comprises a DALI bus signal transceiving isolation circuit, a DALI expansion bus signal transceiving isolation circuit, an internal power supply DC/DC isolation conversion circuit, and an MCU control circuit, and the MCU control circuit is connected to the DALI bus signal transceiving isolation circuit, the DALI expansion bus signal transceiving isolation circuit, and the internal power supply DC/DC isolation conversion circuit, respectively.

3. The DALI bus transmission distance expansion control system as claimed in claim 1, wherein the DALI transmission expansion bus power supply comprises an AC/DC constant voltage conversion circuit, a DC/DC current limiting circuit, an AC input protection circuit, an EMC filter circuit and an output state indicating circuit, wherein the input end of the AC input protection circuit and the EMC filter circuit is connected with an external AC power supply input; the input end of the AC/DC constant voltage conversion circuit is connected with the output of the AC input protection and EMC filter circuit, and the output end of the AC/DC constant voltage conversion circuit is connected with the DC/DC current limiting circuit; the output end of the DC/DC current limiting circuit is connected with a DALI transmission expansion bus, and the output state indicating circuit is connected with the DC/DC current limiting circuit.

4. The DALI bus transmission distance expansion control system as claimed in claim 1, wherein the DALI subsystem is a lighting control system of the DALI protocol.

5. The DALI bus transmission distance expansion control system as claimed in claim 4, wherein a DALI bus power supply, a DALI lamp, a DALI switch, a DALI sensor and a DALI application controller are provided in the DALI subsystem.

6. The DALI bus transmission distance expansion control system as claimed in claim 5, wherein the number of DALI subsystems is N, wherein N is more than or equal to 1.

7. The DALI bus transmission distance expansion control system as claimed in claim 6, wherein the number of DALI transmission expansion buses is M, M ≧ 1.

Technical Field

The invention relates to the technical field of intelligent lighting control, in particular to a DALI bus transmission distance expansion control system.

Background

DALI (Digital Addressable Lighting Interface) is a Lighting standard defined by IEC62386, and one DALI bus can access up to 64 controlled Lighting devices (e.g., LED lamps, relays, etc.) and 64 control devices (e.g., switches, sensors, etc.). DALI is widely used in large venues, commercial lighting, and office lighting control systems as the mainstream intelligent lighting technology.

The DALI bus can provide power to devices on the bus (bus power supply current is 250mA maximum) as well as for the transmission of communication signals. Since the rated voltage of the DALI bus power supply is only 16VDC, in order to effectively distinguish between high and low logic levels received by DALI communication, two devices located at the farthest positions on the bus are required to transmit high level, and the voltage drop cannot exceed 2V when the DALI system is in practical application, so that the wiring distance of the farthest devices on the same DALI bus is limited to not exceed 300 meters according to the commonly used wiring wire (1.5mm2 copper wire).

However, with the continuous expansion of the application field of DALI technology, the existing wiring distance of 300 meters makes it difficult to apply to the scenario where the lamps are arranged in a long distance straight line, such as a high-speed rail platform, a production line, and road lighting inside a factory, and under the wiring constraint of 300 meters, if the distance between the lamps is 25 meters, at most 12 lamps can be accessed (the capacity of at most 64 lamps can be accessed in a single system is not reached), and the system utilization efficiency is extremely low.

Disclosure of Invention

The technical scheme adopted by the invention is as follows: a DALI bus transmission distance extension control system is characterized in that: the DALI transmission expansion device is connected with the DALI transmission expansion bus power supply through the DALI transmission expansion bus, and the DALI transmission expansion device is connected with the DALI subsystem.

Furthermore, the DALI transmission expansion device comprises a DALI bus signal transceiving isolation circuit, a DALI expansion bus signal transceiving isolation circuit, an internal power supply DC/DC isolation conversion circuit and an MCU control circuit, wherein the MCU control circuit is respectively connected with the DALI bus signal transceiving isolation circuit, the DALI expansion bus signal transceiving isolation circuit and the internal power supply DC/DC isolation conversion circuit.

Furthermore, the DALI transmission expansion bus power supply comprises an AC/DC constant voltage conversion circuit, a DC/DC current limiting circuit, an AC input protection circuit, an EMC filter circuit and an output state indicating circuit, wherein the input end of the AC input protection circuit and the EMC filter circuit is connected with an AC power supply input; the input end of the AC/DC constant voltage conversion circuit is connected with the output of the AC input protection and EMC filter circuit, and the output end of the AC/DC constant voltage conversion circuit is connected with the DC/DC current limiting circuit; the output end of the DC/DC current limiting circuit is connected with an external DALI transmission expansion bus, and the output state indicating circuit is connected with the DC/DC current limiting circuit.

Further, the DALI subsystem is a lighting control system of the DALI protocol.

Furthermore, a DALI bus power supply, a DALI lamp, a DALI switch, a DALI sensor and a DALI application controller are arranged in the DALI subsystem.

Furthermore, the number of the DALI subsystems is N, and N is more than or equal to 1.

Furthermore, the number of the DALI transmission expansion buses is M, and M is more than or equal to 1.

Has the advantages that: compared with the prior art, the method is simple to implement and use, and does not influence the definitions of a transmission control layer, a network layer and an application layer of the existing DALI standard. The DALI lighting system breaks through the limitation of the wiring distance of a single bus on the premise of not changing the conventional DALI standard interface and bus topology, so that the DALI lighting system can be applied to the scene where the lighting system is distributed linearly at a long distance.

Drawings

FIG. 1 is a schematic diagram of a DALI bus transmission distance expansion control system according to the present invention;

FIG. 2 is a schematic diagram of a DALI transmission extension apparatus according to the present invention;

FIG. 3 is a schematic diagram of a DALI transport expansion bus power supply of the present invention;

fig. 4 is a schematic diagram of an application of the DALI transmission expansion bus system according to the present invention.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the accompanying drawings. The invention may be embodied in different forms and is not limited to the embodiments described herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete.

Example 1

As shown in fig. 1, a DALI bus transmission distance expansion control system includes a DALI transmission expansion device, a DALI transmission expansion bus power supply, a DALI subsystem, and a DALI transmission expansion bus, where the DALI transmission expansion device is connected to the DALI transmission expansion bus power supply through the DALI transmission expansion bus, and the DALI transmission expansion device is connected to the DALI subsystem.

As shown in fig. 2, the DALI transmission extension device includes a DALI bus signal transceiving isolation circuit, a DALI extension bus signal transceiving isolation circuit, an internal power supply DC/DC isolation conversion circuit, and an MCU control circuit, where the MCU control circuit is connected to the DALI bus signal transceiving isolation circuit, the DALI extension bus signal transceiving isolation circuit, and the internal power supply DC/DC isolation conversion circuit, respectively. When the DALI transmission expansion device detects that the bus level on one side of the DALI bus or one side of the DALI transmission expansion bus becomes low, the bus level on the other side is pulled down in real time until the level on the other side returns to normal, and because only the change of the physical transmission level is processed, the processing speed of the MCU is high, and the transmission time sequence of the DALI standard bus is hardly influenced.

The DALI transmission expansion bus power supply source as shown in FIG. 3 comprises an AC/DC constant voltage conversion circuit, a DC/DC current limiting circuit, an AC input protection circuit, an EMC filter circuit and an output state indicating circuit, wherein the input end of the AC input protection and EMC filter circuit is connected with an AC power supply input, the input end of the AC/DC constant voltage conversion circuit is connected with the output end of the AC input protection and EMC filter circuit, the output end of the AC/DC constant voltage conversion circuit is connected with the DC/DC current limiting circuit, the output end of the DC/DC current limiting circuit is connected with an external DALI transmission expansion bus, and the output state indicating circuit is connected with the DC.

The logic levels of the DALI bus signal defined in the DALI standard (IEC62386-101ed2.0) are:

DALI bus signal receiving: the lower limit of the high level is 9.5V, and the upper limit of the low level is 6.5V;

DALI bus signal sender: the lower limit of the high level is 10.0V, and the upper limit of the low level is 4.5V.

When the DALI bus signal sending end tries to pull down the bus voltage to a low level, in an extreme case, the low level of the sending end is measured to be 4.5V, and at this time, it is ensured that the levels measured at the receiving ends of all other devices on the bus are not higher than 6.5V, and all the devices can correctly identify that the bus is the low level. Therefore, the bus voltage drop is 6.5V-4.5V-2V at most.

After the nominal voltage of the DALI transmission expansion bus power supply is raised to 48V, in order to provide a larger expansion bus voltage drop (e.g. 16V), the range of the DALI transmission expansion bus power supply and the range of the high and low level thresholds of the sending end and the receiving end of the DALI expansion bus signal may be redefined, for example, as follows:

DALI transmission extension bus supply voltage range: minimum 40.0V, rated 48.0V, maximum 56.0V;

signal range on transmission expansion bus: minimum 0V, maximum 56.0V;

absolute range of signal on transmission expansion bus: minimum-6.5V, maximum 60.0V;

DALI transmission extension bus signal receiving end: the high level is 23.5-54V, and the low level is-6.5-20.5V;

the DALI transmission expansion bus signal sending end: the high level is 24.0-54V, and the low level is 0-4.5V.

If the low level measured by pulling down the transmission expansion bus by the DALI transmission expansion bus signal sending end is 4.5V, the level measured by the DALI transmission expansion bus signal receiving end only needs to meet the requirement that the level does not exceed the upper limit of the low level by 20.5V, and the allowed transmission expansion bus voltage drop is 16.0V-20.5V.

The allowable high level when the DALI transmission expansion bus signal sending end releases the bus is 24.0V, and the minimum value of the DALI transmission expansion bus power supply voltage is 40.0V, so that the allowable transmission expansion bus voltage drop is 40.0V-24.0V-16.0V.

The maximum expansion bus voltage drop of 16.0V is 8 times greater than 2.0V originally specified by DALI standard, so the transmission distance is also increased by 8 times under the same wire conditions.

Example 2

As shown in fig. 4, the DALI subsystem is a lighting control system of the DALI protocol, and is provided with a DALI bus power supply, a DALI lamp, a DALI switch, a DALI sensor, a DALI application controller, and the like. The number of DALI subsystems can be 1 or more; the number of expansion buses may also increase as the number of DALI subsystems increases. When the existing DALI system bus is wired, the DALI subsystems can be divided into a plurality of DALI subsystems according to the wiring area and the wiring distance, the transmission distance between different DALI subsystems is extended by adding a DALI transmission extension device, and particularly, the wiring distance can be greatly increased by providing a DALI transmission extension bus power supply for an extension bus connected between two or more DALI transmission extension devices to increase the bus power supply level value.

In the above embodiments, all functions may be implemented, or a part of the functions may be implemented as necessary.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.