A high-precision current source is a device that provides an accurate and stable current output. It is widely used in industrial automation, scientific research, and instrumentation to detect, calibrate, and drive other equipment.
The principle of a high-precision current source is based on feedback control and precision circuit design. Below, Xi'an Antai Electronics will introduce the principle of high-precision current source in detail.
A high-precision current source contains a reference current source. A reference current source is a very stable current source that provides a known, accurate current value as a reference. This can be achieved by using stable resistors and precision current amplifiers.
The high-precision current source uses a feedback control loop. The loop compares the output current to the reference current and adjusts the output current to be as close to the reference current as possible through feedback control. This feedback control can be achieved by comparing current values, using operational amplifiers, and feedback networks.
In order to improve the accuracy and stability of the current source, a series of calibration and compensation techniques are used. For example, the stability of the power supply can be calibrated to eliminate the effect of power supply noise on the output. At the same time, a temperature sensor and compensation circuit can be used to compensate for the drift caused by temperature and ensure the stability of the output current.
Figure: ATS-2000C series high-precision current source.
High-precision current sources can also be digitized for greater accuracy and flexibility. The digitized current source can be frequency controlled and phase controlled by a digital phase-locked loop for more accurate current output.
The principle of a high-precision current source is based on a reference current source, a feedback control loop, and calibration compensation techniques. Through precise circuit design and stable current source, as well as the application of various calibration and compensation techniques, the high-precision current source can provide accurate and stable current output to meet various high-precision measurement and control needs. To learn about high-precision current sources, pay attention to: