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Digital-control constant-current source control loop

A technology of control loop and constant current source, applied in control/regulation systems, instruments, regulating electrical variables, etc., can solve the problem of difficulty in connecting microcontrollers to different types of switching power supply control chips, and achieve low cost, easy migration, Easy to integrate effects

Pending Publication Date: 2019-04-30
SICHUAN AGRI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to simplify the hardware transformation process brought by the application of the switching power supply controller to the numerical control constant current source, solve the problem that the existing numerical control constant current source control loop is not easy to connect with the microcontroller, and the control loop is difficult to migrate between different types of switching power supply control chips Problem, the present invention proposes a control loop of a numerically controlled constant current source mainly composed of an operational amplifier, a current detection resistor, and a DA converter

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Embodiment Construction

[0012] exist figure 2 In the shown embodiment, the maximum output voltage and current of the constant current source are related to the selected switching power supply control chip (12). When the resolution of the DA converter (1) (2) is constant, the selection of the maximum power and resistance value of the current detection resistor (11) is related to the expected maximum output current and the set current resolution of the complete constant current source circuit. The microcontroller is connected with the DA converter, and changes the output voltage of the DA converter by sending instructions to complete the setting of the feedback pin voltage and the constant current control voltage. The output of the second operational amplifier is connected to the feedback pin of the switching power supply control chip, the output of the switching power supply is connected to the hot end of the load through the output inductor, and the cold end of the load is connected to the hot end o...

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Abstract

Provided in the invention is a digital-control constant-current source control loop comprising an adder and a subtractor that are formed by DA converters and operational amplifiers and a current detection resistor. The control loop has a simple structure and is easy to use. The output value of the DA converter is set only based on an own feedback voltage of a switch power controller and the valueof the current detection resistor, so that an objective of controlling the output current by using software is achieved. The complete digital-control constant-current source is formed by combining thedigital-control constant-current source control loop with the necessary direct-current power, the switch power controller, the inductor, a peripheral capacitive resistor, and a micro controller.

Description

technical field [0001] The invention relates to a constant current source control loop, in particular to a numerical control constant current source control loop applied to a switching power supply. Background technique [0002] The constant current source can be used to drive devices that are mainly controlled by current, such as driving semiconductor cooling chips, driving LED light bars, and DC motor speed regulation, while the numerical control constant current source can receive control signals from the microprocessor to change its output current. Size, so it is more suitable for the above applications, especially for the control of peltier coolers. At present, most numerical control constant current sources are constant current sources based on MOSFETs. The voltage on the power supply side remains constant. Combined with the current feedback signal, the voltage drop on the MOSFET is adjusted to complete the constant current output. At this time, the MOSFET is different...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 康志亮张紫东黄鹏
Owner SICHUAN AGRI UNIV