System and method for outputting of analog quantity current
An output system, analog technology, applied in the direction of control/regulation system, adjustment of electrical variables, instruments, etc., can solve the problems of reducing equipment reliability, power consumption, equipment temperature rise, etc., to avoid rapid temperature increase and improve lifespan. Effect
Active Publication Date: 2012-07-04
ZHEJIANG SUPCON TECH +1
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide an analog current output system and method to solve the problem in the prior art that the product of the input impedance and the output current of the driven and controlled actuator is small, resulting in a large amount of power consumption, and at the same time making the equipment Technical issues where increased internal temperatures reduce device reliability
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[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0036] The structural diagram of Embodiment 1 of an analog electric power output system provided by the present invention is as follows: figure 2 As shown, it includes a feedback voltage output module 201, an adjustable voltage output module 202 and a voltage-current conversion module 203, wherein:
[0037] The feedback voltage output module 201 is configured to obtain the current voltage at both ends of the voltage regulating tube of the voltage-current conv...
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The invention provides a system for outputting of analog quantity current, which is characterized in that the system comprises an adjustable voltage output module, a feedback voltage output module and a voltage / current conversion module. The feedback voltage output module is used for acquiring current voltage at two ends of a voltage adjusting tube of the voltage / current conversion module and generating feedback voltage according to the current voltage. The adjustable voltage output module is arranged between power supplying voltage and the voltage / current conversion module and used for receiving the feedback voltage transmitted by the feedback voltage output module and leading the current voltage of the voltage adjusting tube to be in a preset range by adjusting output voltage of the adjustable voltage output module according to the feedback voltage. The voltage / current conversion module is used for performing driving control on an execution mechanism by outputting current.
Description
technical field [0001] The invention relates to the fields of automation and instruments, in particular to an analog current output system and method. Background technique [0002] In the prior art, the analog current output module outputs 4-20mA current to realize the driving control of the actuators of the production site and public works, and the power supply voltage of the general analog current output module is 24V, including the voltage-current conversion module, like figure 1 Shown is a schematic structural diagram of the voltage-current conversion module in the prior art, where RL is the input impedance of the actuator, that is, the load impedance of the voltage-current conversion module, and the voltage-current conversion module includes an operational amplifier A, a conversion resistor Rf, and a voltage adjustment tube M , wherein, the current on the acquisition circuit of the switching resistor is negatively fed back to the operational amplifier, so that the outp...
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IPC IPC(8): G05F1/565
Inventor 金媛金建祥郭淳王文辉
Owner ZHEJIANG SUPCON TECH