4‑20ma signal output circuit
A signal output and circuit technology, applied in logic circuits using optoelectronic devices, logic circuits using specific components, and adjusting electrical variables, etc., can solve problems such as inability to effectively suppress noise signals, poor anti-interference ability, and burning boards
Inactive Publication Date: 2017-04-05
赵庆松
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Problems solved by technology
[0002] In many industries, the current output signal of 4-20mA is often used. The traditional 4-20mA current circuit has no photoelectric isolation between the main board and the anti-interference ability is poor, and the noise signal cannot be effectively suppressed, and it is easy to burn the board. Phenomenon
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[0011] Examples such as figure 1 As shown, the 4-20mA signal output circuit includes photocoupler U2, six inverters U3, four op-amp integrated circuits U1, three-terminal voltage regulator D1, electrolytic capacitor C1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, adjustable resistor RX1 and adjustable resistor RX2, the model of the four operational amplifier integrated circuit U1 is LM324, The four-op-amp integrated circuit U1 includes operational amplifier U1A, operational amplifier U1B, and operational amplifier U1C. The type of optocoupler U2 is TLP521-1, and the type of six-inverter U3 is 4069. U3A, the second inverter U3B, the third inverter U3C, the fourth inverter U3D, the fifth inverter U3E and the sixth inverter U3F,
[0012] One input terminal of the photocoupler U2 is connected to the PWM signal output by the CPU, and the PWM signal is ph...
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The invention discloses a microampere-level current generation circuit. An adjustable resistor VR1 is connected with a voltage stabilization chip D1 in parallel. The positive electrode of the voltage stabilization chip D1 is grounded through a resistor R1. An adjusting wafer of the adjustable resistor VR1 is connected with the non-inverting input end of an operational amplifier A1. The negative electrode of the voltage stabilization chip D1 is connected with the positive electrode of a Zener diode D2, one end of a resistor R2 and one end of a capacitor C1. The negative electrode of the Zener diode D2 is connected with the positive power end of the operational amplifier A1 and a positive power supply. The other end of the capacitor C1 is grounded. The other end of the resistor R2 is connected with the inverting input end of the operational amplifier A1 and the source electrode S of a field-effect transistor Tr1. The drain electrode D of the field-effect transistor Tr1 is grounded. The grid electrode G of the field-effect transistor Tr1 is connected with the output end of the operational amplifier A1 through a resistor R3. The microampere-level current generation circuit can still provide a constant current even when load resistance is changed, is used for measuring a resistance value or an impedance value, and is suitable for circuits with weak currents and the microampere below a normal number. Due to the fact that the field-effect transistor is used as a current control element, the circuit structure is very simple, and a high-performance constant current source can be obtained.
Description
technical field [0001] The invention relates to a signal output circuit, in particular to a 4-20mA circuit belonging to the field of electronic technology. Background technique [0002] In many industries, the current output signal of 4-20mA is often used. The traditional 4-20mA current circuit has no photoelectric isolation between the main board and the anti-interference ability is poor, and the noise signal cannot be effectively suppressed, and it is easy to burn the board. Phenomenon. Contents of the invention [0003] The problem to be solved by the present invention is to provide a 4-20mA signal output circuit for the above deficiencies, to overcome the defects of the 4-20mA signal output circuit in the prior art, and to adopt the 4-20mA signal output circuit of the present invention, which has Noise interference, the advantages of signal stability. [0004] In order to solve the above problems, the technical solution adopted in the present invention is: 4-20mA sig...
Claims
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IPC IPC(8): H03K19/14G05F1/56
Inventor 赵庆松赵国平巨泽旺
Owner 赵庆松