Direct-current motor speed regulating system with overload protection function

A technology for DC motors and overload protection circuits, which is applied in the direction of emergency protection circuit devices, electrical components, excitation or armature current control, etc. It can solve the problems of low output square wave duty ratio and easy damage, and achieve accurate control, The effect of strong practicality and ensuring reliability

Inactive Publication Date: 2018-04-20
四川新驱科为科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the pulse width modulator used by the existing DC motor not only has a low duty ratio of the output square wave, but also is easily damaged, and provides a DC motor speed control system with overload protection function

Method used

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  • Direct-current motor speed regulating system with overload protection function

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Embodiment

[0017] Such as figure 1 As shown, the present invention discloses a DC motor speed control system with overload protection function, including a control chip U, a pulse width modulation circuit connected to the UCC pin, DIS pin and T pin of the control chip U respectively, A three-manifold drive circuit connected to the R pin, F pin and GND pin of the control chip U respectively, and an overload protection circuit connected to the R pin of the control chip U and the three-manifold drive circuit; The GND pin of the control chip U is grounded.

[0018] The control chip U in this embodiment is preferably implemented by using the NE555 integrated chip with pulse generation function. The control chip U is combined with a pulse width modulation circuit to continuously adjust the duty ratio of the output pulse, that is, the pulse width It is fully adjusted without affecting the oscillation frequency of the control chip U, so that the duty cycle of the pulse reaches 99.99%.

[0019]...

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Abstract

The invention discloses a DC motor speed regulation system with an overload protection function, which is characterized in that it includes a control chip U, a pulse width modulation circuit connected to the UCC pin, the DIS pin and the T pin of the control chip U respectively , a three-manifold drive circuit connected to the R pin, F pin and GND pin of the control chip U, and an overload protection circuit connected to the R pin of the control chip U and the three-manifold drive circuit. The present invention has simple structure and strong practicability. The pulse width modulation circuit provided by the present invention can continuously adjust the duty cycle of the output pulse, that is, fully adjust the pulse width without affecting the oscillation frequency, so that the duty cycle of the pulse The duty ratio reaches 99.99%, thereby ensuring the duty ratio of the present invention to output high pulses, and well solving the problem that the pulse width modulator has a low duty ratio of outputting square waves.

Description

technical field [0001] The invention relates to a speed control system, in particular to a DC motor speed control system with overload protection function. Background technique [0002] A DC motor is a motor that converts DC electrical energy into mechanical energy, and is widely used in electric drive because of its good speed regulation performance. The DC motor achieves speed regulation through a pulse width modulator. The full name of the pulse width modulator is: Pulse Width Modulator, or PWM for short. The pulse width modulator changes the average current power on the load from 0-100% by changing the duty cycle of the output square wave, thereby changing the speed of the DC motor. [0003] However, the duty cycle of the output square wave of the pulse width modulator used in the existing DC motor is mostly about 50%, that is to say, the energy power output by the pulse width modulator is only about 50%. Therefore, the existing The pulse width modulator used in the DC...

Claims

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Application Information

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IPC IPC(8): H02P7/29H02H7/085
CPCH02P7/29H02H7/0833H02H7/0856
Inventor 王前明
Owner 四川新驱科为科技有限公司
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