Direct current motor control circuit with heat protection function

A DC motor and control circuit technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as system failure to remind users to deal with, overheating, spontaneous combustion, etc., achieve low power consumption and voltage drop, simple implementation method, and prevent risk of accidents smoke effect

Inactive Publication Date: 2013-07-17
思与行科技(苏州)有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, practice has proved that in some applications, when the electronic control unit system is not running, the motor can still be powered on due to a short circuit between the gate and the drain. In this case, the main processor of the controller is not powered on. Naturally, the system cannot remind the user to take corresponding measures. If the current value of the motor at this time cannot cause the overcurrent fuse to blow, the motor will continue to run. When the heat accumulates to a certain level, it will still overheat and cause spontaneous combustion.

Method used

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  • Direct current motor control circuit with heat protection function
  • Direct current motor control circuit with heat protection function

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Embodiment 1

[0013] figure 1 The schematic diagram of the circuit structure of the general DC motor control circuit is shown. In the automotive electronic control unit, especially the drive circuit unit, for safety reasons, it is generally recommended to use a high-end drive structure, and in order to ensure the efficiency of power conversion, a high-end switch tube is required. The driving voltage is higher than the input power supply voltage, so a boost circuit is generally required to realize it, and the output of the boost circuit is generally designed to be twice the input voltage source. Normally, when MRG gets a drive signal, Q1 turns on and the motor runs. If there is an over-current situation, when the time exceeds the specified time, the fuse will blow to protect the control circuit. When MRG loses the drive signal, Q1 is cut off and the motor stops. However, in some specific cases, due to the infiltration of the conductive solution into the electronic control unit, the gate an...

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Abstract

The invention belongs to the field of direct current motor control and discloses a motor control circuit for preventing failure in a heat event in the working process of a direct current motor. In order to realize the function, the invention adopts the technical scheme that an intelligent voltage limiting module is additionally arranged on a gate and a drain of a metal oxide semiconductor field effect transistor (MOSFET) of a control loop; and if the gate and the drain are short-circuited, the intelligent voltage limiting module is started to limit voltage between the gate and a source to be smaller than starting voltage, so that an MOSFET is cut off even under the working condition, the phenomenon of spontaneous combustion caused by hot stack can be effectively avoided, and the reliability and safety of a direct current motor control circuit are ensured.

Description

technical field [0001] The invention belongs to the field of DC motor control, and in particular relates to a novel motor control circuit for avoiding thermal events during the working process of the DC motor. Background technique [0002] With the development of science and technology, motors are more and more widely used in people's lives, and more and more appear in people's vehicles, such as electric bicycles, electric wheelchairs, electric tricycles and even electric vehicles. Therefore, the control of the motor is becoming more and more important. On the one hand, the control effect of the motor directly determines the performance of the system, such as the comfort of people when riding this type of vehicle. More importantly, the control of the motor determines the System security. Because the control of the motor is often controlled by a large current, a lot of heat is generated, which further affects the safety of components and systems, which is especially promin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08
Inventor 毛靖姚成华
Owner 思与行科技(苏州)有限公司
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