Low power consumption power supply circuit of meter bus slave computer

A technology of instrument bus and power supply circuit, applied in the field of power supply circuit, can solve the problems of inability to obtain stable power supply voltage, waste, etc., achieve good promotion value, reduce current consumption, and increase the effect of meter bus network nodes

Inactive Publication Date: 2010-07-14
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the current of the constant current source of the slave power supply circuit can only be in accordance with I active +I s The reason is: if the constant current source current is less than this value, the current provided by the power supply circuit will not be able to meet the

Method used

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  • Low power consumption power supply circuit of meter bus slave computer
  • Low power consumption power supply circuit of meter bus slave computer
  • Low power consumption power supply circuit of meter bus slave computer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 (community water meter meter reading system based on meter bus):

[0025] A community uses a photoelectric direct-reading remote water meter reading system to read the water consumption of more than 500 households in the community through the meter bus. In this instrument bus system, there is only one instrument bus master for reading data at the property management of the community, and only the photoelectric direct-reading meter as the instrument bus slave is installed in the water user's home. Among the slaves, the power consumption of the active slave selected by the master is about 6mA; the power consumption of other slaves that are not selected and in the dormant state is about 1mA. If a traditional slave power supply based on a constant current source is used, the slave in the dormant state must also absorb more than 6mA of current from the bus to ensure that the constant current source can provide enough power for the slave after it is activated by ...

Embodiment 2

[0028] Embodiment 2 (community gas meter, electric meter meter reading system based on meter bus)

[0029] The analysis of the overall current consumption of the meter bus in this example is the same as that in Embodiment 1, and will not be repeated here.

[0030] As for the specific implementation of the circuit, this example uses another low-power reference chip LM385-ADJ as the U REF To generate a voltage reference, unlike the LM4040-4.1 used in the previous example, the reference voltage generated by LM385-ADJ is adjustable, and the stable working current can be reduced to 10uA. Adjust the output voltage of LM385-ADJ to 6.2V, so that the output Vcc generated by the entire power system can be controlled at about 5V, and the 5V power supply can meet the needs of most common single-chip microcomputer systems.

[0031] Specifically, in this example, U REF For the LM385-ADJ the output is regulated to 6.2V. Current limiting resistor R 1 Take 100KΩ to meet the needs of LM385-...

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Abstract

The invention relates to a low power consumption power supply circuit of a meter bus slave computer, which belongs to the technical field of instruments and meters and comprises a constant voltage source circuit with high pressure resistance and low quiescent current and a low-pass filter circuit, wherein two triodes which are connected into a Darlington form are used as an emitter follower of the constant voltage source circuit, the base electrode of the emitter follower is connected with a standard voltage generated by a voltage reference, and a voltage with low output resistance is output from an emitter to form a constant voltage source; the low-pass filter circuit is formed by connecting a resistor with a low resistance value and a capacitor in series; and the emitter of the emitter follower is connected with the resistor of the low-pass filter circuit. Compared with the solution of the prior art, the current consumption of the slave computer in a dormant state is greatly reduced on the basis of not increasing the cost of the single slave computer, thus the overall energy consumption is reduced, and meanwhile, the number of the slave computers of a traditional meter bus network can be greatly increased, and the nodes of the meter bus network can be increased. The low power consumption power supply circuit of the meter bus slave computer is particularly suitable for low power consumption meter bus systems, such as water meters, gas meters and the like.

Description

technical field [0001] The invention relates to a power supply circuit of an instrument bus slave, belonging to the technical field of instruments and meters. technical background [0002] Meter-Bus (M-Bus for short) is a new type of serial bus standard, which is mainly used in the networking of consumption measuring instruments such as water meters, gas meters and thermal instruments. Because the instrument bus has the advantages of convenient networking, low cost and strong anti-interference ability, it has become the European standard for 2-wire bus. widely used. The main feature of the instrument bus is that only two non-polar wires are used as the power supply line and the data line for transmitting serial data at the same time. All terminal devices are connected in parallel on these two lines. Different nodes on the bus are distinguished by different address codes. . [0003] According to the different roles played in the instrument bus communication, the nodes of t...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 何乐生王威廉杨敏李世军
Owner YUNNAN UNIV
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