Power supply method for converter load and two-wire system 4-20 mA transmitter circuit

Abstract

The invention discloses a power supply method for a converter load and a two-wire system 4-20 mA transmitter circuit. According to the method, a current-limiting energy storage circuit is additionallyarranged at the front end of the load power supply of a two-wire system 4-20 mA transmitter, and the current limiting energy storage circuit acquires and stores electric energy from the current loopunder the allowable current level, and instantaneous large current is provided for the transmitter circuit or a load when needed. Loop current outputting burrs caused by a transmitter circuit or a load directly taking electricity from a 4 -20 mA loop can be prevented.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to a transmitter circuit, in particular to a transmitter load power supply method and a two-wire 4-20mA transmitter circuit. Background technique [0002] In the prior art, 4-20 mA current is widely used to transmit analog quantities, and the principle of the two-wire transmitter is to use the 4-20 mA signal to provide electric energy for itself. If the power consumption of the transmitter itself is greater than 4mA, it will be impossible to output the lower limit of 4mA. Therefore, it is generally required that the power consumption of the two-wire transmitter (all circuits including the sensor) should not exceed 3.5mA, which is a two-wire system. One of the fundamental principles of transmitter design, so the low power consumption of the circuit has become the main design difficulty. [0003] However, the low power consumption requirement of the two-wire 4-20mA transmit...

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Problems solved by technology

[0003] However, the low power consumption requirement of the two-wire 4-20mA transmitter circuit has brought many restrictions to the design, especially when the transmitter uses digital interface sensors or functional modules, and these sensors or functional modules work periodically, resulting in variable The instantaneous power consumption of the transmitter exceeds the output lower limit by 4mA, and a current glitch is formed on the output loop of the transmitter, which directly leads to an error in the output result

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