A power current isolation acquisition circuit
A collection circuit, galvanic isolation technology, applied in voltage/current isolation, measurement using digital measurement technology, etc., can solve the problems of increased signal processing complexity, loss of acquisition accuracy, mutual interference, etc., to avoid A/D conversion accuracy loss, increase the anti-interference strength, and eliminate the effect of coupling interference
Active Publication Date: 2021-08-03
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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Problems solved by technology
[0002] The aircraft electromechanical system contains a large number of needs to detect the power and current of the interface. The traditional method is to connect the sampling resistor in series before the power current of the interface is connected to the ground wire, and calculate the power and current of the interface by collecting the resistance voltage. When it is inside, it is necessary to set a separate power and current return line, which leads to a heavy cable design, and at the same time, due to the mutual interference and coupling of the ground plane, the accuracy of analog quantity acquisition is reduced and the complexity of signal processing is increased; another existing method The sampling resistor is connected in series before the power current flows into the interface, and the analog voltage is sent to the A / D conversion module after being transformed by the isolation op amp, but the isolation op amp will cause the A / D conversion module to lose 2 to 3 digits of acquisition accuracy. Reduced Accuracy of Power Current Acquisition
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0015] figure 1 It is a functional block diagram of a power current isolation acquisition circuit. refer to figure 1 As shown, the circuit includes an isolated power supply unit, a sampling resistor, a signal conditioning unit, an A / D conversion unit, and an isolated optocoupler unit. The sampling resistor is connected in series to the power circuit, and the voltage at both ends of the sampling resistor is conditioned by the signal conditioning unit and then sent to A / D conversion unit, the conversion result of A / D conversion unit is transmitted to the electromechanical management computer through the isolation optocoupler unit, so as to complete the calculation of the power current value.
[0016] figure 2 Shown is a schematic diagram of 28V bus current acquisition. The 5V digital power supply generates 3.3V power after passing through th...
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The invention belongs to the technical field of airborne analog quantity acquisition, in particular to a power and current isolation acquisition circuit based on floating ground power supply. The circuit includes an isolated power supply unit, a sampling resistor, a signal conditioning unit, an A / D conversion unit and an isolated optocoupler unit, the sampling resistor is connected in series on the power circuit, and the voltage at both ends of the sampling resistor is conditioned by the signal conditioning unit and then sent to the A / D D conversion unit, the conversion result of A / D conversion unit is transmitted to the electromechanical management computer through the isolated optocoupler unit; one end of the isolated optocoupler unit is powered by an isolated power supply unit, and the other end is powered by a digital power supply; A / D conversion unit and signal conditioning unit Both are powered by an isolated power supply unit; the positive end of the isolated power supply unit is connected to the current input end of the sampling resistor. A power current isolation acquisition circuit is provided to realize high-precision isolation acquisition of power current.
Description
technical field [0001] The invention belongs to the technical field of airborne analog quantity acquisition, in particular to a power and current isolation acquisition circuit based on floating ground power supply. Background technique [0002] The aircraft electromechanical system contains a large number of needs to detect the power and current of the interface. The traditional method is to connect the sampling resistor in series before the power current of the interface is connected to the ground wire, and calculate the power and current of the interface by collecting the resistance voltage. When it is inside, it is necessary to set a separate power and current return line, which leads to a heavy cable design, and at the same time, due to the mutual interference and coupling of the ground plane, the accuracy of analog quantity acquisition is reduced and the complexity of signal processing is increased; another existing method The sampling resistor is connected in series be...
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IPC IPC(8): G01R19/25G01R15/22
Inventor 呼明亮於二军王永国邓道杰王凌伟闫稳
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA