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Multi-gear direct current control circuit

A DC control circuit, multi-speed technology, applied in the field of power electronics, can solve the problems of PWM signal duty cycle not meeting the requirements, unstable power supply voltage control, occupying CPU resources, etc., to avoid abnormal speed control and speed control. Accurate, simple circuit design effect

Pending Publication Date: 2022-07-08
成都市联洲国际技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the controller can directly output the PWM signal control to adjust the fan speed, using the CPU to output the PWM signal consumes a lot of CPU resources, and due to the scheduling of other high-priority tasks in the CPU, the duty cycle of the output PWM signal may not meet the requirements. Therefore, the control of the fan gear is too dependent on the performance of the CPU, and the control of the power supply voltage is unstable.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] see figure 1 , is a schematic structural diagram of a multi-gear DC control circuit provided by an embodiment of the present invention, and the circuit includes a voltage control module and a gear control module;

[0038] The voltage control module includes at least one input terminal, and each input terminal is connected to an external GPIO for inputting a level signal; the output terminal of the voltage control module is connected to the control terminal of the gear control module;

[0039] The input end of the gear control module is used to input the first power supply, and the output end of the gear control module is used to control the voltage signal to the positive pole of the fan interface.

[0040] The voltage control module detects the potential level of each level signal by identifying at least one input level signal, and outputs the corresponding potential signal to the control end of the gear control signal;

[0041] The gear control signal converts the vol...

Embodiment 2

[0044] In yet another embodiment provided by the present invention, the voltage control module of the circuit includes N+1 resistance units and N switch units;

[0045] The first end of the first resistance unit is used to connect the second power supply, the second end of the first resistance unit is connected to the input end of the i-th switch unit through the i+1-th resistance unit, and the i-th switch unit The output terminal of the ith switch unit is grounded; the control terminal of the ith switching unit is used as the ith input terminal of the voltage control module for the ith level signal;

[0046] The second section of the first resistance unit is used as the output terminal of the voltage control module for outputting the potential signal;

[0047] Among them, N≥1, i=1, 2, . . . , N.

[0048] see figure 2 , is a circuit schematic diagram of a multi-speed DC control circuit provided by another embodiment of the present invention; in this embodiment, N=3 is taken...

Embodiment 3

[0062] In yet another embodiment provided by the present invention, see figure 2 , the circuit further includes a first capacitor unit C1; the first end of the first capacitor unit C1 is connected to the input end of the gear control module, and the second end of the first capacitor unit C1 is grounded;

[0063] It should be noted that, in this embodiment, the first capacitor unit C1 is composed of a capacitor, and in other embodiments, the first capacitor unit may be a capacitive reactance device composed of several series-parallel capacitors.

[0064] By grounding the first capacitor unit at the input end of the gear control module, the change speed of the potential signal output by the voltage control module when switching between the starting voltage and the rotational speed is slowed down, and the stability of the circuit is improved.

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PUM

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Abstract

The invention discloses a multi-gear direct current control circuit. The circuit comprises a voltage control module and a gear control module, the voltage control module outputs a corresponding potential signal to the control end of the gear control module according to at least one path of level signal input by the input end of the voltage control module; the gear control module is used for converting a first power supply input by the input end into control voltage of a corresponding gear according to a potential signal input by the control end of the gear control module and outputting the control voltage to the positive electrode of the fan interface through the output end. The rotating speed of the fan can be stably adjusted, CPU resources are not occupied, rotating speed control abnormity caused when a CPU is overloaded is avoided, and finer fan rotating speed gear adjustment is achieved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multi-speed direct current control circuit. Background technique [0002] Fans are widely used in security products that require airflow to provide adequate cooling conditions for various components, such as NVRs, DVRs, and switches. Most of the fans commonly used in such products are brushless DC fans, including second-line fans, third-line fans, and fourth-line fans. Most of the current brushless DC fans use the controller to output a PWM signal to control the fan gear, and change the fan power supply voltage by changing the duty cycle of the PWM signal to control the fan speed. [0003] Although the fan speed can be adjusted by directly outputting the PWM signal from the controller, using the CPU to output the PWM signal takes up CPU resources very much, and due to the scheduling of other high-priority tasks in the CPU, the duty cycle of the output PWM signal may ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00
CPCF04D27/004F05D2270/52Y02B30/70
Inventor 陈金萍
Owner 成都市联洲国际技术有限公司