High-precision field power supply program control system
A high-precision, power supply technology, applied in the field of photoelectric detection, can solve the problems of high precision and great influence on accuracy, and achieve the effects of improving precision, reducing interference, and being easy to carry
Inactive Publication Date: 2019-05-14
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology
However, the required bias voltage needs to be continuously adjustable and requires high precision, and the quality of the bias voltage has a great influence on the accuracy of the detection results or test results.
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[0020] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0021] This embodiment provides a high-precision field power program control system, such as figure 1 As shown, it is a single circuit board structure. The circuit board is equipped with an FPGA as a control unit, more than two DACs for outputting control signals, a keyboard for inputting instructions, an LCD screen for status display, and a The control signal is the connector from which the DAC output voltage is drawn. The control object is an external DC / DC module.
[0022] The control ports of the keyboard, LCD screen and DAC chip are all connected to the FPGA, and the control of each device is realized by the FPGA. One DAC is one channel, and one channel corresponds to one DC / DC module, and the connector is connected to each piece of DAC.
[0023] The DAC adopts a serial DAC chip with a bit width of at least 12 bits, and the output voltage ranges fro...
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The invention provides a high-precision field power supply program control system. The program control system is a single circuit board structure. An FPGA as a control unit, more than two DACs for outputting control voltages, a keyboard for inputting a control instruction, a liquid crystal display for displaying a state, and a connector for outputting control signals are set on a circuit board. Control objects are external DCs / DC modules. The DACs, the keyboard and the liquid crystal display are connected with the FPGA. A DAC corresponds to a channel. A channel controls a DC / DC module. The connector is connected with output of each DAC. The FPGA analyzes the control instruction input from the keyboard, generates a corresponding DAC configuration time sequence and controls the output voltages of the DACs. The output voltage of each DAC is leaded out through utilization of the connector. The output voltage is the control signal of each DC / DC module. The system is simple and independent and is high in control precision and high in efficiency. Multiway adjustment can be realized.
Description
technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a high-precision field power program control system. Background technique [0002] In the fields of light detection, insulating material and semiconductor material testing, capacitance withstand voltage detection and other fields, it is necessary to use a field power supply to provide bias voltage for photomultiplier tubes, silicon photomultipliers, materials and devices under test. However, the required bias voltage needs to be continuously adjustable and requires high precision, and the quality of the bias voltage has a great influence on the accuracy of the detection results or test results. For example, the silicon photomultiplier, which has been widely used in the field of photodetection in recent years, has a gain that is very sensitive to changes in ambient temperature. It is necessary to adjust the bias voltage applied to it to compensate for the gain drif...
Claims
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IPC IPC(8): G05B19/042
Inventor 陶文泽胡向宇李存惠李斌
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH