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Counter electromotive force detection circuit of brushless motor controller

A technology of brushless motor and back electromotive force, which is applied in the field of automobile cooling fan

Inactive Publication Date: 2020-10-20
上海胜华波汽车电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a brushless motor controller back EMF detection circuit for the deficiencies in the back EMF detection circuit of the existing brushless motor controller for automobile cooling fans, so as to solve the above-mentioned problems in the prior art. Insufficiency

Method used

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  • Counter electromotive force detection circuit of brushless motor controller
  • Counter electromotive force detection circuit of brushless motor controller

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] see figure 2 , a brushless motor controller back EMF detection circuit shown in the figure includes a controller chip 1 and two back EMF detection resistors R2 and R3, and it also includes a control element Q1, which is a MOSFET device or IGBT devices.

[0014] In this specific embodiment, the control element Q1 is a MOSFET device, and its gate S is connected to the control signal READY. The control signal READY of the control element Q1 comes from the signal output after the wake-up of the controller chip 1 is completed. The source S of the control element Q1 Connect one end of the back EMF detection resistor R2 and the analog input port UAD of the controller chip 1, the other end of the back EMF detection resistor R2 is grounded to GND, the drain D is connected to one end of the back EMF detection resistor R2, the other end of the ba...

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Abstract

The invention discloses a counter electromotive force detection circuit of a brushless motor controller, the circuit comprises a controller chip and two counter potential detection resistors, and is characterized by further comprising a control element, and the control element is connected in series between the two counter electromotive force detection resistors and is connected with an analog quantity input port of the controller chip; and a control signal of the control element comes from signal output after the controller chip is awakened. According to the invention, a control element (MOSFET or IGBT device and the like) is added to disconnect an analog quantity detection circuit in the dormant state, so that the reliability of the control chip in the dormant state is improved.

Description

technical field [0001] The invention relates to the technical field of automobile cooling fans, in particular to a back electromotive force detection circuit of a brushless motor controller. Background technique [0002] Most brushless motor controllers for automotive cooling fans require figure 1 The shown back EMF detection circuit is used to detect the back EMF value to control the operation of the brushless motor, but in the case of sleep, the controller chip 1 in the controller has no power supply. At this time, if the brushless motor is affected by external force If the rotation speed is lower, the analog input port of the controller chip 1 will generate voltage, which may increase the risk of damage to the analog input port UAD of the controller chip 1. figure 1 The back EMF sensing resistors R2 and R3 are connected in series. [0003] At present, most of the designs of automotive cooling fans have no means for this potential problem, mainly relying on the design of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/182G01R31/34
CPCG01R31/34H02P6/182
Inventor 徐辉杨秀贵金圣日吴维炜叶鑫
Owner 上海胜华波汽车电器有限公司
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