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Voltage adjustable direct-current motor speed regulating system

A technology for DC motors and speed control systems, which is applied in the field of excitation or armature current control, electrical components, emergency protection circuit devices, etc. It can solve the problems of low output square wave duty cycle and poor output voltage stability, and achieve accurate control , to ensure stability and practical effect

Inactive Publication Date: 2018-05-18
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 in the existing DC motor not only has a low duty ratio of the output square wave, but also has poor output voltage stability, and provides a voltage adjustable DC motor speed control system

Method used

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  • Voltage adjustable direct-current motor speed regulating system

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Embodiment

[0019] Such as figure 1 As shown, the present invention discloses a voltage-adjustable DC motor speed control system, which includes a control chip U, a pulse width modulation circuit connected to the UCC pin, DIS pin and T pin of the control chip U, and a control chip U. The buffer protection circuit connected to the UCC pin of the chip U, the three-manifold drive circuit connected to the R pin, the F pin and the GND pin of the control chip U, and the regulator connected to the three-manifold drive circuit voltage circuit; the GND pin of the control chip U is grounded.

[0020] 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 pu...

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PUM

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Abstract

The invention discloses a voltage adjustable direct-current motor speed regulating system. The system is characterized by comprising a control chip U, a pulse width modulation circuit, a cushion protection circuit, a transistor driving circuit connected with a pin R, a pin F and a pin GND of the control chip U, and a voltage regulating circuit connected with the transistor driving circuit. The system is simple in structure and high in practicability; the duty ratio of output pulse can be continuously regulated through the arranged pulse width modulation circuit, the pulse width is sufficientlyregulated, the oscillation frequency is not affected, and the pulse duty ratio reaches 99.99%, so that it is ensured that the high pulse duty ratio can be output, and the problem that a pulse width modulator has the low output square wave duty ratio is well solved.

Description

technical field [0001] The invention relates to a speed regulating system, in particular to a voltage adjustable DC motor speed regulating system. 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: PuL1se WidthModuL1ator, 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 motor n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P7/29H02H7/085H02H7/08
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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