Programmable power circuit of meter bus slave

A technology of instrument bus and power circuit, applied in the field of power circuit, can solve problems such as high or low reading accuracy, low power supply voltage, and decreased accuracy of infrared photoelectric readings

Inactive Publication Date: 2012-06-20
KUNMING GAOCHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the traditional technology cannot switch the power supply voltage of the instrument bus slave, the designer can only use a compromise method to determine the power supply voltage of the instrument bus slave—choose a power supply that can ensure the normal operation of the activated slave and keep the voltage as low a...

Method used

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  • Programmable power circuit of meter bus slave
  • Programmable power circuit of meter bus slave
  • Programmable power circuit of meter bus slave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 (District water 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 host used to read data at the property management of the community, and only the photoelectric direct-reading meter head as the instrument bus slave is installed in the water user's home.

[0026] The constant voltage reference UREF1 used by the slave power supply uses the bandgap reference chip LM4040-4.1 with low operating current, and the UREF2 uses LM4040-2.5, and their breakdown voltages are 4.1V and 2.5V, respectively. Because LM4040 only needs 60uA to work stably. The current-limiting resistance R1 is 75KΩ to ensure that the system can work stably during the instrument bus communication period. In order to reduce the quiescent current of the constant ...

Embodiment 2

[0030] Embodiment 2 (community gas meter and electric meter reading system based on meter bus):

[0031] The analysis of the overall current consumption of the meter bus in this example is the same as that of Embodiment 1, and will not be repeated here.

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PUM

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Abstract

The invention relates to a power circuit of a meter bus slave, belonging to the technical field of apparatus meters. The programmable power circuit of the meter bus slave consists of a program-controlled reference voltage generating circuit and an emitter follower, wherein the program-controlled reference voltage generating circuit consists of resistors, two voltage-stabilizing diodes, a reinforced NMOS (n-channel metal oxide semiconductor) tube and a singlechip MCU (micro control unit); a resistor R1 is serially connected with the two voltage-stabilizing diodes; the reinforced NMOS tube which is connected with one voltage-stabilizing diode in parallel is connected with a grid electrode of an NMOS tube VM through an I/O (input/output) port of the singlechip MCU; a resistor R2 is connected between the I/O port of the singlechip MCU and the grid electrode of the NMOS tube VM; a resistor R3 is connected between the I/O port of the singlechip MCU and a positive power supply; the emitter follower comprises two dynatrons V1 and V2 which are connected in a Darlington way; collector electrodes of the two dynatrons V1 and V2 are connected with a high voltage end of the meter bus; emitter electrodes of the dynatrons are connected on a slave load RL; and a substrate of the emitter follower formed by the two dynatrons is connected with the output of the program-controlled reference voltage generating circuit.

Description

Technical field [0001] The invention relates to a power circuit of an instrument bus slave, belonging to the technical field of instrumentation. Background technique [0002] Chinese Patent Application No. 200910218395.1 discloses a "low power consumption circuit of instrument bus slave", which consists of a constant voltage source circuit with high withstand voltage and low quiescent current and a low pass filter circuit. The constant voltage source The circuit consists of two transistors connected in Darlington form as emitter followers. The base of this emitter follower is connected to a standard voltage generated by a voltage reference, and a voltage with very low output resistance is output from the emitter. , Thereby forming a constant voltage source; the low-pass filter circuit is formed by a low-resistance resistor and a capacitor in series; the emitter of the emitter follower is connected with the resistor of the low-pass filter circuit. [0003] Meter-Bus (M-Bus for shor...

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
Owner KUNMING GAOCHI TECH
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