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Pulse width modulation closed loop control circuit for speed regulation module

A technology of pulse width modulation and closed-loop control circuit, which is applied in the direction of pump control, non-variable pump, machine/engine, etc. It can solve the problem of unstable wind speed and achieve the effect of stable control of wind speed

Active Publication Date: 2016-12-14
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit of this prior art controls the speed of the fan by adjusting the duty cycle of the pulse width modulation PWM. When the power supply voltage changes, the wind speed of the fan will also change accordingly, and the phenomenon of unstable wind speed will appear.

Method used

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  • Pulse width modulation closed loop control circuit for speed regulation module
  • Pulse width modulation closed loop control circuit for speed regulation module

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Embodiment Construction

[0024] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments. In the following description, specific details, such as specific configurations and components, are provided only to assist in a comprehensive understanding of the embodiments of the present invention. Accordingly, those of ordinary skill in the art should recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0025] It should be understood that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of t...

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Abstract

The invention provides a pulse width modulation closed loop control circuit for a speed regulation module. The pulse width modulation closed loop control circuit for the speed regulation module comprises a load, a control circuit, a low-pass filter circuit, a difference amplifier, a comparison circuit, an oscillator and a speed regulation circuit, wherein the first end of the load is connected to a power supply VBAT; the second end of the load is grounded through the speed regulation circuit; the control circuit outputs a PWM (pulse width modulation) signal; the low-pass filter circuit is connected with the output end of the control circuit and is used for converting the PWM (pulse width modulation) signal to a direct-current signal and outputting the direct-current signal; the difference amplifier carries out sampling and amplifying on voltages at the two ends of the load and outputs an amplifying signal; the comparison circuit compares the amplifying signal to the direct-current signal and outputs a difference signal; the duty ratio of the PWM signal output by the output end of the oscillator is regulated according to the difference signal; and the output end of the speed regulation circuit is connected with the second end of the load. According to the pulse width modulation closed loop control circuit for the speed regulation module, pulse width modulation control is carried out on the speed regulation module, so that the voltages at the two ends of a fan are still stable when the voltage of the power supply varies, and the wind speed is stably controlled.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a pulse width modulation closed-loop control circuit of a speed regulating module. Background technique [0002] The fan of the existing automobile air-conditioning system adopts the speed regulating module to regulate the fan speed. The speed control module generally uses a pulse width modulation (PWM, Pulse Width Modulation) signal for open-loop control. [0003] For the circuit diagram of the existing speed control module control circuit, see figure 1 , where Q is the speed regulation module, which controls the load fan. The control circuit outputs a pulse width modulation PWM signal to control the on-off of the triode U, and then control the switch of the speed regulating module. The control circuit controls the voltage at both ends of the fan by adjusting the duty ratio of the pulse width modulation PWM signal, thereby achieving the purpose of controlling the wind ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00
CPCF04D27/004
Inventor 贾春冬
Owner BEIJING ELECTRIC VEHICLE
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