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Low-power-consumption direct-current motor locked-rotor protection circuit

A DC motor stalling and protection circuit technology, applied to emergency protection circuit devices, electrical components, etc., can solve the problems of easy arc generation, large conduction loss of mechanical switches, and poor life of mechanical switches, so as to reduce power consumption, The conduction loss is small and the effect of reducing the resistance value

Pending Publication Date: 2020-12-29
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above solution, due to the use of mechanical switches such as relays as protection means, the switch life of the mechanical switch is poor, and arcs are prone to occur, and when the motor is working, the mechanical switch brings relatively large conduction loss

Method used

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  • Low-power-consumption direct-current motor locked-rotor protection circuit

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Embodiment Construction

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention , but not to limit the scope of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "inner" and "outer" indicate the orientation or position The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientat...

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PUM

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Abstract

The invention discloses a low power consumption direct current motor locked-rotor protection circuit which comprises a power supply, a switch circuit, a sampling circuit, a motor coil and a voltage comparison circuit. The switch circuit comprises an MOS; the positive electrode of the power supply returns to the negative electrode of the power supply sequentially through the MOS of the switch circuit, the motor coil and the sampling circuit to form a series direct-current path; reference voltage is input into the non-inverting input end of the voltage comparison circuit, the inverting input endof the voltage comparison circuit is connected with the sampling circuit, sampling voltage is inputted, and the output end of the voltage comparison circuit is connected with the MOS to control the conduction state of the MOS so as to control the power supply state of the series direct-current path to the motor coil. According to the locked-rotor protection circuit for the low-power-consumption direct-current motor, the MOS is used for building the switch circuit, the conduction impedance of the MOS is small, the conduction loss of the MOS is small when the motor works, and the power consumption can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a low-power consumption DC motor stall protection circuit. Background technique [0002] When the DC motor is running, once the motor is blocked, the power factor of the motor at this time is extremely low, and the current when the motor is blocked will increase abnormally. If the motor is blocked for a long time, it will burn out the motor and cause irreversible damage to the motor. [0003] The existing DC motor stall protection circuit samples the power supply current of the motor, and when the current exceeds a preset value, trips quickly to cut off the power supply of the motor. [0004] The Chinese patent with application number CN201920266301.7 discloses a DC motor protection circuit and a DC motor protection device. The DC motor protection circuit is connected between the DC power supply and the DC motor, and includes: a start switch, connected between the DC ...

Claims

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Application Information

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IPC IPC(8): H02H7/085H02H7/08
CPCH02H7/085H02H7/0811H02H7/0844
Inventor 石国德李涪帆孙福庆郭小玉于龙
Owner CRRC QINGDAO SIFANG CO LTD