A portable bidirectional constant current source module

Abstract

A portable bi-directional constant current source module provided by the invention belongs to the technical field of electronic techniques. The portable bi-directional constant current source module structurally comprises a current setting circuit (1), an output control circuit (5), a final output circuit (6) and a first feedback circuit (7), and is characterized by also structurally comprising a subtracter circuit (2), a PID circuit (3), a current-limiting setting circuit (4), a second feedback circuit (8), a display drive circuit (9) and a front panel (10). The portable design is adopted, a 9-pin D-shaped interface is used as an input / output interface, the structure is compact, system integration is easy, the circuit part adopts a double negative feedback structure, so that the characteristics of stable and high output current, high safety, wide usage occasions and the like, and output current two-way regulation also can be realized.

Description

technical field [0001] The present invention belongs to the technical field of electronic technology. It particularly relates to a portable high-stability bidirectional constant current source module. Background technique [0002] The constant current source has important applications in many occasions such as optical fiber communication, LED lighting, and laser drive. In some occasions, such as laser drive, the output current stability of the constant current source is very important, and the instability of the output current will cause Affect the life of the laser and the output optical power. Commonly used measures to improve current stability are: 1. Using the nonlinear magnetization principle of magnetic saturation reactor to improve stability; 2. Connecting a large resistance in series in the load circuit (relative to the load resistance); 3. Realizing the current through the negative feedback network Automatic stabilization. Among these schemes, the first scheme is...

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Problems solved by technology

Among these schemes, the first scheme is greatly affected by the device itself and has limited improvement in stability; the second scheme can effectively reduce the impact of changes in load resistance due to a large resistor connected in series in the load circuit. The influence of the output current, but due to the existence of the large resistance of the load circuit, the output current is very small, generally only in the milliampere level, and most of the power is dropped on the large resistance, which also makes the efficiency extremely low; the third scheme Due to the automatic adjustment function of the negative feedback network itself, the output current can be automatically stabilized without being affected by load changes, so it is currently the most effective way to improve current stability. However, in the currently disclosed technologies, generally Adopting a single linear feedback network, the biggest disadvantage of this scheme is that once the feedback network fails, the system will be in an open-loop working state, the output current will increase sharply, and it is easy to damage the load and the circuit itself. Another disadvantage is the use of The occasion is limited, and it can only be applied to the occasion where the load responds linearly to the current. In some specific occasions, if the load responds to the current with a delay or lead, this constant current source based on a single linear feedback network will lose automatic stabilization capability

In addition, the current common constant current source devices are all desktop instruments, which are bulky, heavy, and not easy for system integration.

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