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A pwm speed control module

A speed control module, PWM signal technology, applied in pulse technology, electronic switches, semiconductor devices, etc., can solve the problems of MOSFET field effect tube heating damage, etc., to avoid damage to MOSFET field effect tube and avoid distortion.

Active Publication Date: 2020-04-10
WUHAN AOZE ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a PWM speed regulation module, and solve the technical problem that the MOSFET field effect tube is easily damaged due to heat generation when the PWM control signal is distorted in the prior art

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  • A pwm speed control module
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Embodiment Construction

[0013] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0014] like figure 2 As shown, the present invention provides a PWM speed control module 10, including a speed control circuit 11, a Schmitt comparator 12, and an electronic switch 13. The speed control circuit 11 is used to adjust the motor speed according to the PWM signal; the Schmitt comparator 12 is used to shape the distorted PWM signal and make the MOSFET field effect tube of the speed control circuit 11 cut off or turned on; the electronic switch 13 is used to judge whether the input signal is a PWM signal, if it is, it will be turned on, otherwise it will be turned off and cut of...

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Abstract

The invention discloses a PWM (pulse width modulation) speed regulation module. The PWM speed regulation module comprises a speed regulation circuit, a Schmidt comparator and an electronic switch; thespeed regulation circuit is used for regulation the speed of a motor according to PWM signals; the Schmidt comparator is used for shaping the distorted PWM signals and enabling an MOSFET (metal-oxide-semiconductor field effect transistor) field-effect tube of a speed regulation circuit to be cut off or connected; the electronic switch is used for judging whether inputted signals are the PWM signals or not, and turning on the electrode switch if yes, or else turning off the electrode switch and cutting off a power supply of the Schmidt comparator. By the arrangement of the electronic switch, the power supply of the Schmidt comparator is controlled to be cut off or not according to the fact whether the inputted signals are the PWM signals or not, operation of the MOSFET field-effect tube isthereby controlled, and damage to the MOSFET due to non-PWM signals is avoided; the PWM signals are shaped through the arranged Schmidt comparator, and damage to the MOSFET due to distortion of the PWM signals is avoided.

Description

technical field [0001] The invention relates to a motor speed regulation technology, in particular to a PWM speed regulation module. Background technique [0002] like figure 1 As shown, it is the circuit schematic diagram of the PWM speed regulation module of traditional commercial vehicles. If the PWM control signal output from HVAC (Heating, Ventilation and Air Conditioning) is distorted due to EMC interference or other reasons, the MOSFET field effect transistor cannot be distorted. Q3 works in the switching state, which makes the MOSFET field effect transistor Q3 work in the amplifying state, which is easy to cause the MOSFET field effect transistor Q3 to be damaged due to excessive heat generation. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, and to propose a PWM speed regulation module to solve the technical problem that the MOSFET field effect transistor is easily damaged by heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P7/28H03K17/081
CPCH02P7/28H03K17/08104H03K2017/0806
Inventor 黄俊李鄂胜董楚卿黄浩
Owner WUHAN AOZE ELECTRONICS