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Constant current source

A constant current source, voltage technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of low power utilization efficiency, increase the complexity of system thermal design, poor use flexibility, etc., to reduce thermal design. Complexity, flexibility and power efficiency

Active Publication Date: 2012-03-14
HANS LASER TECH IND GRP CO LTD
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Problems solved by technology

Although the constant current source can meet the requirement of constant load current, for different loads, different constant current sources need to be customized, and the flexibility of use is poor.
In order to be able to adapt to the change of the load, a large driving voltage is usually given when designing the constant current source, but its power utilization efficiency is often relatively low. When the load carried by the constant current source is small, most of the electric energy will be converted into heat energy. This will increase the complexity of the thermal design of the system

Method used

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Embodiment Construction

[0019] Such as figure 1 , 2 As shown, the constant current source of the present invention is composed of a voltage stabilizer 1 , a driving element 2 , a constant current feedback unit 3 and a load adaptive feedback unit 4 . The voltage stabilizer 1 is a DC conversion module or a DC conversion chip with an output voltage adjustable function, and the driving element 2 is a bipolar transistor or a MOSFET. The voltage stabilizer 1 provides the driving voltage Vdd to the series circuit 6 composed of the driving element 2 and the load 5, the constant current feedback unit 3 detects the load current, and provides a driving signal to the driving element 2 according to the detection result, and adjusts the output signal of the driving element 2, The adaptive feedback unit 4 detects the load voltage, and provides an adjustment signal to the voltage stabilizer 1 according to the detection result to adjust the output signal of the voltage stabilizer 1 .

[0020] Such as figure 1 As s...

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Abstract

The present invention discloses a constant current source which consists of a voltage stabilizer, a drive element, a constant feedback unit and a load adaptive feedback unit. The constant feedback unit controls the constant current source to provide constant current for the load, the load adaptive feedback unit controls the output voltage of constant current source to change as the change of load, and thereby realizing the adaptivity of load, enhancing the flexibility of the constant current source and the electricity utilizing efficiency, and reducing the complexity of the thermal design forthe system.

Description

technical field [0001] The invention belongs to the technical field of power supplies, in particular to the technical field of constant current sources. Background technique [0002] Solid-state lasers usually use laser diodes as their pumping light source. The stability of the pumping light source directly affects the performance of the laser. Therefore, the power supply for the laser diode must be a constant current source. The traditional constant current source uses a voltage stabilizer to provide the driving voltage, and connects the load through the driving element, that is, the laser diode. At the same time, a feedback loop is added to compare the load current with the external set current, and adjust the feedback loop to the driving element according to the comparison result. The driving signal realizes constant current through the mediation of the driving element. Although the constant current source can meet the requirement of constant load current, for different ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 高云峰赵恒
Owner HANS LASER TECH IND GRP CO LTD
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