Terminal resistor automatic match circuit in gas detector

A technology of gas detectors and terminal resistors, applied in the direction of impedance network, electrical components, multi-terminal pair network, etc., can solve the problems of lowering the communication quality of the system and unfavorable improvement of electromagnetic compatibility, etc., and achieve anti-interference and reliability improvement, Improve power usage time and reduce energy consumption

Inactive Publication Date: 2010-10-27
上海线友电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will generate current radiation instead of voltage radiation, so the use of diodes for terminal matching is not conducive to the improvement of electromagnetic compatibility, and will reduce the quality of system communication

Method used

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  • Terminal resistor automatic match circuit in gas detector
  • Terminal resistor automatic match circuit in gas detector
  • Terminal resistor automatic match circuit in gas detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 with figure 2 As shown, the terminal resistance automatic matching circuit in the gas detector of the present invention includes twelve resistors (R1 to R12) and twelve single-pole single-throw switches SW-SPST (S1 to S12), and each resistor is connected to a corresponding single-pole The single-throw switches are connected in parallel, the first resistor R1 to the sixth resistor R6 are connected in series, the seventh resistor R7 to the twelfth resistor R12 are connected in series, the first resistor R1 to the sixth resistor R6 are connected to the seventh resistor R7 to the twelfth resistor R12 is connected in parallel, and each end of the first resistor R1 to the twelfth resistor R12 forms a network node, which are network nodes a, b, c, d, e, f, g, h, i, J, K, L respectively. The terminal resistance automatic matching circuit uses the analog electronic switch M51326P for switch selection, and the analog electronic switch M51326P also has twelve ne...

Embodiment 2

[0023] This embodiment is basically the same as Embodiment 1, the difference is: as Figure 4 As shown, the multi-way selection switch CD4051 is used instead of the single-pole single-throw switch SW-SPST to adjust the resistance value incorporated into the circuit network. The rest of the control flow is the same as in Embodiment 1.

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PUM

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Abstract

The invention discloses a terminal resistor automatic match circuit in a gas detector, which is characterized by comprising 12 resistors and 12 single-pole single-throw switches, wherein each resistor is connected with a corresponding single-pole single-throw switch in parallel; the 1-6 resistors are connected in series; the 7-12 resistors are connected in series; and the 1-6 resistors are connected with the 7-12 resistors in parallel. In the circuit, two digitally adjustable resistors are added at the two ends of a CAN bus, play quite important roles in matching of bus impedance, greatly improve the anti-interference performance and reliability of data communication, simultaneously reduce energy consumption and lengthen the service time of power.

Description

technical field [0001] The invention relates to a gas detector technology, in particular to a terminal resistance automatic matching circuit in the gas detector. Background technique [0002] CAN (Controller Area Network, controller local area network) is a multi-master transmission, when the reflected voltage wave (bus differential voltage) is suppressed below the 0.9V dominant differential level at each CAN station, or increases the 0.5V recessive differential level , will lead to errors in CAN receiving data; at the same time, in order to eliminate the short circuit phenomenon, the nature of its CANH (high) and CANL (low) levels is different, such as the two logic states of CANH are high level and high resistance state, CANL The two logic states are low-level and high-impedance, and the level of the high-impedance state is actually inaccurate. Therefore, in the differentially transmitted CAN bus, in order to reduce the impedance in the CANH and CANL loops, the CANH and CA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/06
Inventor 霍剑飞
Owner 上海线友电子有限公司
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