DALI bus power supply circuit

A technology of power supply circuit and bus, which is applied in the field of DALI bus power supply circuit, can solve the problems of equipment reliability reduction, cost increase, lack of short-circuit protection function, etc., and achieve the effect of ensuring stability and reliability and reducing high voltage requirements

Pending Publication Date: 2019-03-08
珠海世讯科技有限公司
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  • Abstract
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Problems solved by technology

[0007] 3. When no bus device is pulled low, the output bus current of the existing DALI bus power supply circuit is greater than 130mA, and the output bus voltage is less than 6.5V, resulting in at least 0.8W higher power consumption of the triode Q1 than the high level. Q1 heats up, reducing equipment reliability
[0008] 4. When there is a short circuit on the bus, there is no short circuit protection function, the power consumption of the transistor Q1 is greater than 2W, it is easy to heat and damage, and the cost increases

Method used

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Embodiment Construction

[0023] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] refer to figure 1 , 3 , the DALI bus power supply circuit of this embodiment includes a voltage source 1, a current limiting circuit 2 and a port 3 connected in sequence, and also includes a voltage reference element 4, an amplifying circuit 5 and a feedback circuit 6, and the voltage reference element 4 and the feedback circuit 6 in parallel, the input end of the voltage reference element 4 and the inpu...

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Abstract

The invention relates to a DALI bus power supply circuit, which comprises a voltage source, a current limiting circuit, a port, a voltage reference element, an amplifier circuit and a feedback circuit; the voltage reference element and the feedback circuit are in parallel; the input end of the voltage reference element and the input end of the feedback circuit are connected with the port respectively; the output end of the voltage reference element and the output end of the feedback circuit are connected with the input end of the amplifier circuit; the output end of the amplifier circuit is connected with the current limiting circuit. According to the DALI bus power supply circuit, the voltage reference element determines the state of the bus device, and the circuit signal is adjusted according to the state of the bus device; the amplifier circuit ensures sufficient voltage drop for the long-distance transmission of the data, thereby reducing the high voltage requirement for the voltage source, and the feedback circuit ensures the stability and reliability of the product.

Description

technical field [0001] The invention relates to the technical field of power supply circuits, in particular to a DALI bus power supply circuit. Background technique [0002] The DALI communication interface protocol has simple coding and reliable communication. The high and low levels are identified by the voltage difference between the two lines. If it is greater than 9.5V, it is high level, and if it is less than 6.5V, it is low level. Common DALI device interface circuits such as Figure 4 As shown, a maximum of 64 bus devices can be connected. The existing DALI bus power supply circuit such as figure 2 As shown, it includes the voltage source, current limiting circuit and port connected in sequence. The voltage source adopts a voltage source of 18-22.5V. The current limiting circuit includes transistor Q1, resistor R1, resistor R15 and compound diode D6, and the interface circuit between the port and DALI equipment connect. [0003] The circuit characteristic of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 周炳权杨同彦郑茂吴元福尚雨秦支昊
Owner 珠海世讯科技有限公司
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