A variable frequency constant current source output circuit
A technology of output circuit and constant current source, which is applied in the direction of converting AC power input to AC power output, output power conversion device, electrical components, etc., can solve the problems of increasing design cost, prone to error, expensive price, etc., and achieve reduction The manufacturing cost and the volume of the device, the requirement to reduce the working speed, and the effect of fast real-time response
Active Publication Date: 2019-11-22
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology
In this process, the PWM adjustment speed is slow, the real-time response to feedback is poor, and errors are prone to occur.
One solution is to use a dedicated PWM hardware circuit, such as a TL494 microcontroller, but it is expensive and increases the design cost
[0005] 2. The components are large in size and poor in portability
The frequency conversion constant current source based on PWM technology, its output filter unit needs to combine capacitance and inductance coil for filtering, especially the hollow inductance coil is bulky and heavy, which is not convenient to reduce the overall volume and weight of the device
Method used
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[0023] The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0024] Such as figure 1 with figure 2 As shown, a frequency conversion constant current source output circuit provided by the present invention includes a rectification filter unit, an optocoupler isolation inverter unit 5, an output filter unit 6, a current feedback adjustment unit 4, and an inverter control unit connected in sequence. The variable control unit is connected with the optocoupler isolation inverter unit 5; the inverter control unit includes an operating poin...
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The invention discloses a frequency conversion constant current source output circuit, relating to the technical field of power electronics. The frequency conversion constant current source output circuit includes a rectifier filter unit, an optocoupler isolation inverter unit, an output filter unit, a current feedback regulator unit and an inverter control unit which are sequentially connected, and the inverter control unit is connected with the optocoupler isolation inverter unit. Only an analog signal output circuit is adopted to reduce the requirement on the working speed of a control chip; meanwhile, for the current feedback regulator unit, a series of processes of digital sampling, analog-to-digital conversion, digital PID logic operation are not needed, the constant current control can be directly carried out by directly using the analog PID circuit, real-time response speed is fast, the stability is high , the accurate and stable signal output can be realized. The structure of a hardware circuit, particularly, the air-core inductance coil in the output filter unit, is simplified, and the manufacturing cost and the device size can be effectively reduced.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a variable frequency constant current source output circuit. Background technique [0002] The power supply is an indispensable and important part of various electronic instruments and equipment, and its performance is directly related to the performance index of the electronic equipment and whether it can work safely and reliably. The variable frequency constant current source is a very important power supply device, so designing a variable frequency constant current source with good performance has very important practical significance. [0003] With the continuous development of power electronics technology, the detection and control devices of various electric equipment and various high-power instruments all need a variable frequency constant current source with high power and high precision output as the injection signal source and power output source. ...
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IPC IPC(8): H02M5/458
CPCH02M5/458
Inventor 吕泽承
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD