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Automatic braking circuit and control method of electric wheelchair with brush motor

A technology of electric wheelchairs and brushed motors, which can be used in vehicle ambulance, patient chairs or special transportation tools, medical transportation, etc. It can solve the problems of many faults, high cost, and soft parking, and achieve low failure rate, low cost effect

Active Publication Date: 2020-04-24
SHANGHAI HUBANG INTELLIGENT REHABILITATION EQUIP CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing electric wheelchairs that cannot be parked on the braking slope, the faults are high, the cost is high, and the parking is not soft, the invention provides an automatic braking circuit and a control method for an electric wheelchair with a brush motor. The circuit and method can effectively Smooth and automatic braking, parking on slopes, low failure rate and low cost

Method used

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  • Automatic braking circuit and control method of electric wheelchair with brush motor

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Embodiment Construction

[0008] The implementation mode is based on a ready-made common controller without brakes, adding the following hardware and software to effectively brake the car automatically and stably, and park the car on a slope. It does not contain common controller practices.

[0009] There are two sampling resistors in each H-bridge driving circuit, which are respectively connected to the source terminals of the lower field effect transistors Q3 and Q4 on both sides. The two sampling resistors respectively output sampling signals A and B to the microcontroller; the sampling voltage is very low and absolutely safe, but The AD of the single-chip microcomputer requires 16 bits or more. If the AD of the single-chip microcomputer is below 12 bits, the sampling signals A and B must be amplified by one stage and then sent to the single-chip microcomputer respectively. Therefore, the general hardware only adds a sampling resistor, and the sampling resistor can be a 5-10 milliohm constantan wire...

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Abstract

Each H-bridge drive circuit of a brake circuit of a brush motor electric wheelchair is provided with two sampling resistors which are respectively connected to source terminals of two lower field effect transistors Q3 and Q4, and the two sampling resistors respectively output sampling signals A and B to a single-chip microcomputer; in a parking state, if the wheelchair does not move, the voltagesof the sampling signals A and B are nearly zero, if the wheelchair slightly moves, the voltage of the A or B rises, forward movement or backward movement is judged according to the A or B, and the single-chip microcomputer further issues a reverse motion instruction to prevent the forward movement or the backward movement so as to play an automatic brake function; and in a braking state, the sampling voltages are compared with current sampling voltages during corresponding PWM locked-rotor so as to determine the brake force, and to adjust the brake PWM. Therefore, the effective smooth and automatic braking and parking in a slope can be realized with low failure rate and low cost.

Description

technical field [0001] The invention relates to an automatic braking circuit and a control method, in particular to an automatic braking circuit and a control method of an electric wheelchair with a brush motor. Background technique [0002] Electric wheelchairs are supplies for the disabled and the elderly. With the increase of the elderly and the improvement of living standards, electric wheelchairs have become more and more popular. After the electric wheelchair stops, it must automatically brake the car and automatically stop on the slope. Live (park). However, 90% of the existing electric wheelchairs have brushed motors (because the starting torque of the brushed motors is strong), they are divided into three types, one is that there is no automatic brake, which is not safe; The brake composed of brake pads is bulky and expensive. Another kind is exactly to rely on the reverse braking brake of controller as open (announcement) number CN105496667A, CN105496667B, has ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61G5/10
CPCA61G5/1005A61G5/1051A61G2203/10
Inventor 韩雪
Owner SHANGHAI HUBANG INTELLIGENT REHABILITATION EQUIP CO LTD