HTZ-3000W CNC constant current source

Constant current source, AC constant current source, DC constant current source, current generator, high current generatorAlso known as current source or steady current source, it is a wideband, high-precision AC steady current power supply with fast response speed, high constant current accuracy, long-term stable operation, suitable for various types of loads (resistive, inductive, capacitive), and other advantages. Mainly used for detecting thermal relaysPlastic case circuit breakers, small short circuit breakers, and production applications that require setting of rated current, operating current, short-circuit protection current, etc.

structure

A constant current source is a widely used component in circuits, and here are the structures and characteristics of common constant current sources. Constant current sources are divided into two forms: current source and current sink.

The simplest constant current source

The simplest constant current source is to use a constant current diode. In fact, the application of constant current diodes is relatively rare. Apart from the fact that the constant current characteristics of constant current diodes are not very good, the limited current specifications and high price are also important reasons.

The most commonly used simple constant current source

Using two identical transistors and the relatively stable BE voltage of the transistors as a reference, the current value is: I = Vbe/R1。

The advantage of this constant current source is that it is simple and easy to operate, and the value of the current can be freely controlled without using special components, which is conducive to reducing the cost of the product. The disadvantage is that the BE voltage of different types of pipes is not a fixed value, and even for the same model, there are some individual differences. At the same time, there will be some fluctuations in this voltage under different operating currents. Therefore, it is not suitable for precise constant current requirements.

In order to accurately output current, an operational amplifier is usually used as feedback, while a field-effect transistor is used to avoid errors caused by the BE current of the transistor. If the current does not need to be particularly precise, the field-effect transistor can also be replaced with a transistor.

HTZ-3000W CNC constant current sourceIt is a high-precision bipolar constant current power supply that adopts high-performance fully digital control, with a maximum power of 30A/100V, widely used for excitation of inductive loads such as electromagnets and Helmholtz coils. Continuous zero crossing of current, contactless commutation, can generate a smooth and stable controlled magnetic field.Continuous field scanning; The control of current or magnetic field modes can provide users with a simple and convenient form of use and control.