阅读说明：本技术 一种不带电磁刹车的无刷电机轮椅的断电刹车装置 (Power-off brake device of brushless motor wheelchair without electromagnetic brake ) 是由 曹义东 郭权 董超 王东东 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种不带电磁刹车的无刷电机轮椅的断电刹车装置,包括串联连接在轮椅控制器与轮椅电机之间的刹车控制板,刹车控制板包括与电源输入端口连接的继电器模块,继电器模块包括：继电器控制电路和继电器,继电器包括与继电器控制电路分别连接的左继电器、右继电器,左继电器分别连接有左输入端口、左输出端口,左输入端口与轮椅控制器的左输出口连接,左输出端口与左无刷电机连接,右继电器分别连接有右输入端口、右输出端口,右输入端口与轮椅控制器的右输出口连接,右输出端口与右无刷电机连接。(The invention discloses a power-off brake device of a brushless motor wheelchair without an electromagnetic brake, which comprises a brake control panel connected between a wheelchair controller and a wheelchair motor in series, wherein the brake control panel comprises a relay module connected with a power input port, and the relay module comprises: the left relay is connected with a left input port and a left output port respectively, the left input port is connected with a left output port of the wheelchair controller, the left output port is connected with the left brushless motor, the right relay is connected with a right input port and a right output port respectively, the right input port is connected with a right output port of the wheelchair controller, and the right output port is connected with the right brushless motor.)

1. A power-off brake apparatus for a brushless motor wheelchair without an electromagnetic brake, comprising a brake control panel connected in series between a wheelchair controller and a wheelchair motor, the wheelchair motor including a left brushless motor and a right brushless motor, the brake control panel comprising:

relay module (5), be connected with power input port (7), relay module (5) includes:

a relay control circuit (51);

the relay (52) comprises a left relay (521) and a right relay (522) which are respectively connected with the relay control circuit (51), wherein a left input port (8) and a left output port (9) are arranged on the left relay (521), the left input port (8) is connected with a left output port of the wheelchair controller, the left output port (9) is connected with the left brushless motor, a right input port (10) and a right output port (11) are arranged on the right relay (522), the right input port (10) is connected with a right output port of the wheelchair controller, and the right output port (11) is connected with the right brushless motor;

the standby power supply module (4) is connected with the relay control circuit (51) and the relay (52) and used for supplying power to the relay control circuit (51) and the relay (52) when the power input port (7) is powered off, and the standby power supply module (4) is connected with the relay control circuit (51) in series through a wire to form a state switching button (6) and used for switching the connection and disconnection states of the standby power supply module (4) and the relay control circuit (51).

2. The electric break brake device of the brushless motor wheelchair without electromagnetic brake as claimed in claim 1, wherein the relay module (5) is connected with the power input port (7) in sequence:

the overvoltage protection circuit (1) is used for performing power-off protection when the voltage of the power input port (7) is abnormal;

and the power supply conversion circuit (2) is used for reducing the voltage of the input power supply of the power supply input port (7).

3. The power-off brake device of the brushless motor wheelchair without the electromagnetic brake as claimed in claim 2, wherein the overvoltage protection circuit (1) is turned on for normal power supply when the voltage input from the power input port (7) is lower than 32V, and the overvoltage protection circuit (1) is turned off for power supply when the voltage input from the power input port (7) is higher than 32V, so as to protect the brake control board.

4. The power-off brake device of the brushless motor wheelchair without the electromagnetic brake as claimed in claim 2, wherein the voltage input of the power conversion circuit (2) has a wide voltage range of 5.5V-40V, 5V output and 3A output current.

5. The power-off brake device of the brushless motor wheelchair without electromagnetic brake as claimed in claim 2, wherein the power switching circuit (2) is further connected with the standby power module (4) through a lithium battery charging module (3) for charging the standby power module (4) through the overvoltage protection circuit (1) by using the power input port (7), and the lithium battery charging module (3) comprises a lithium battery charging management chip (31) and a charging and discharging protection circuit (32).

6. The power-off brake device of the brushless motor wheelchair without the electromagnetic brake as claimed in claim 5, wherein the backup power module (4) comprises a lithium battery (41) and a battery holder (42), the lithium battery (41) is connected and arranged in the battery holder (42), and the battery holder (42) is connected with the power conversion circuit (2) through the lithium battery charging module (3).

Technical Field

The invention belongs to the technical field of electromechanical control, and particularly relates to a power-off brake device of a brushless motor wheelchair without an electromagnetic brake.

Background

With the increasingly serious aging problems of the society in China, in recent years, the nation vigorously supports the development of industries such as endowment, health maintenance and the like, and wheelchairs, particularly electric wheelchairs, are widely concerned as an indispensable part of the industry. The electric wheelchair is generally used by disabled or sick people, so that the driving safety of the electric wheelchair becomes more important. If the brushless electric wheelchair without the electromagnetic brake is powered off accidentally during driving, the wheels do not have any braking force, and the accidental power off during high-speed or up-down-slope driving can cause damage to users, so that certain potential safety hazards exist. Therefore, the invention designs the power-off brake device of the brushless motor wheelchair without the electromagnetic brake.

Disclosure of Invention

In view of the above problems, the present invention provides a power-off brake device for a brushless motor wheelchair without an electromagnetic brake, which has a power-off automatic brake function and can release a brake state by one key.

The technical scheme of the invention is as follows: a power-off brake apparatus for a brushless motor wheelchair without an electromagnetic brake, comprising a brake control panel connected in series between a wheelchair controller and a wheelchair motor, the wheelchair motor including a left brushless motor and a right brushless motor, the brake control panel comprising:

the relay module is connected with power input port, and the relay module includes:

the relay control circuit comprises a first MOS tube, a first triode and a plurality of first resistors which are mutually connected;

the left relay is connected with a left input port and a left output port respectively, the left input port is connected with a left output port of the wheelchair controller, the left output port is connected with the left brushless motor, the right relay is connected with a right input port and a right output port respectively, the right input port is connected with a right output port of the wheelchair controller, and the right output port is connected with the right brushless motor;

the standby power supply module is connected with a relay control circuit of the relay module and used for supplying power to the relay module when the power input port is powered off, and the standby power supply module is connected with a state switching button in series through a wire between the relay modules and used for switching the connection and disconnection states of the standby power supply module and the relay modules.

Further, be connected with in proper order between relay module and the power input port:

the overvoltage protection circuit is used for performing power-off protection when the voltage of the power input port is abnormal, so that the device is prevented from being damaged due to abnormal input voltage;

and the power supply conversion circuit is used for reducing the voltage of the input power supply of the power supply input port.

Further, the overvoltage protection circuit comprises a voltage stabilizing diode, a second triode, a second MOS (metal oxide semiconductor) tube and a plurality of second resistors, wherein the model of the voltage stabilizing diode is SMBJ5363B, the model of the second triode is MMBT5401, the second MOS tube adopts NCE01P18K with a P channel, the conduction voltage of the voltage stabilizing diode is 32V, the second MOS tube conducts normal power supply when the voltage input by the power input port is lower than 32V, and the second MOS tube is turned off and powered off when the voltage input by the power input port is higher than 32V, so that the brake control panel is protected.

Further, the power conversion circuit comprises a DC-DC conversion chip, a diode, a plurality of capacitors and an inductor, wherein the model of the DC-DC conversion chip is LM2596S-5.0, the wide voltage range of voltage input is 5.5V-40V, 5V is output, and the current is 3A.

Further, power supply conversion circuit still with the stand-by power supply module passes through lithium battery charging module and connects, is used for utilizing power input port passes through overvoltage protection circuit charges for the stand-by power supply module, and lithium battery charging module includes lithium battery charging management chip and charge-discharge protection circuit, lithium battery charging management chip adopts the core to be TC4056 single section lithium battery charging management chip's nuclear core plate.

Further, the standby power module comprises a lithium battery and a battery holder, the lithium battery is connected and arranged in the battery holder, the battery holder is connected with the power conversion circuit through the lithium battery charging module, the lithium battery is a 14500 battery with 3.7V and 850mah, and the battery holder is a direct-insertion 14500 battery holder.

Furthermore, the type of the MOS transistor is AO3401, the type of the triode is MMBT4401, and the left relay and the right relay are both dual-channel normally-closed relays with the types of HF115F/005-2ZS4 AF.

The working principle of the invention is as follows:

and (3) normal operation state: the power input port supplies power to the relay module, the relay is electrified and opened, the left relay and the right relay are switched from the normally closed contact to the normally open contact, the UVW three-phase lines of the left brushless motor and the right brushless motor are switched from a mutual short circuit state to a mutual open circuit state, and at the moment, the wheelchair is withdrawn from a braking state and normally runs;

normal shutdown or unexpected power off state: the brake control board is powered off, the left relay and the right relay are in a normally closed state, the UVW three-phase lines of the left brushless motor and the right brushless motor are mutually short-circuited, and the motors are in a braking state; when the wheelchair needs to be pushed in a normal shutdown state, the state switching button on the brake control panel is only required to be pressed to switch to the standby power supply module for supplying power, the standby power supply turns on the left relay and the right relay, the wheelchair exits from a braking state, the UVW three-phase lines of the left brushless motor and the right brushless motor are switched to a mutual open-circuit state from a mutual short-circuit state, the two wheels of the wheelchair are in a free state at the moment, the wheelchair can be pushed easily, the wheelchair exits from a free pushing state, the wheelchair can enter the braking state only by pressing the state switching button again, and the purpose of switching the wheelchair from the braking state to the free state is achieved.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a power-off brake device of a brushless motor wheelchair without an electromagnetic brake, which solves the problem that wheels lose brake force when some existing brushless motor wheelchairs without the electromagnetic brake are shut down or are accidentally powered off, and the wheelchair can stall if the wheelchair runs on a downhill road section. In a word, the invention has the advantages of reasonable design, simple structure, high safety, adjustable braking state and the like, and can ensure the life and property safety of users.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic design of the overvoltage protection circuit of the present invention;

FIG. 3 is a schematic design of the power conversion circuit of the present invention;

FIG. 4 is a schematic circuit diagram of a lithium battery charging module according to the present invention;

fig. 5 is a schematic design of the relay module control circuit of the present invention.

The intelligent control circuit comprises a 1-overvoltage protection circuit, a 11-voltage stabilizing diode, a 12-triode II, a 13-MOS tube II, a 14-resistor II, a 2-power conversion circuit, a 21-DC-DC conversion chip, a 22-diode, a 23-capacitor, a 24-inductor, a 3-lithium battery charging module, a 31-lithium battery charging management chip, a 32-charging and discharging protection circuit, a 4-standby power module, a 41-lithium battery, a 42-battery holder, a 5-relay module, a 51-relay control circuit, a 511-MOS tube I, a 512-triode I, a 513-resistor I, a 52-relay, a 521-left relay, a 522-right relay, a 6-state switching button and a 7-power input port.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Example (b): as shown in fig. 1, a power-off brake device of a brushless motor wheelchair without an electromagnetic brake comprises a brake control panel connected in series between a wheelchair controller and a wheelchair motor, the wheelchair motor comprises a left brushless motor and a right brushless motor, and the brake control panel comprises:

relay module 5 is connected with power input port 7, and relay module 5 includes:

the relay control circuit 51 comprises a first MOS transistor 511, a first triode 512 and a plurality of first resistors 513 which are connected with one another, wherein the model of the first MOS transistor 511 is AO3401, and the model of the first triode 512 is MMBT 4401;

the relay 52 comprises a left relay 521 and a right relay 522 which are respectively connected with the relay control circuit 51, the left relay 521 and the right relay 522 both adopt a dual-channel normally-closed relay with the model of HF115F/005-2ZS4AF, the left relay 521 is respectively connected with a left input port 8 and a left output port 9, the left input port 8 is connected with a left output port of the wheelchair controller, the left output port 9 is connected with a left brushless motor, the right relay 522 is respectively connected with a right input port 10 and a right output port 11, the right input port 10 is connected with a right output port of the wheelchair controller, and the right output port 11 is connected with a right brushless motor;

be connected with in proper order between relay module 5 and the power input port 7:

the overvoltage protection circuit 1 is used for performing power-off protection when the voltage of the power input port 7 is abnormal, the overvoltage protection circuit 1 comprises a voltage-stabilizing diode 11, a second triode 12, a second MOS (metal oxide semiconductor) tube 13 and a plurality of second resistors 14, wherein the model of the voltage-stabilizing diode 11 is SMBJ5363B, the model of the second triode 12 is MMBT5401, the second MOS tube 13 adopts NCE01P18K of a P channel, the conduction voltage of the voltage-stabilizing diode 11 is 32V, the second MOS tube 13 is conducted to normally supply power when the voltage input by the power input port 7 is lower than 32V, and the second MOS tube 13 is turned off to cut off the power to protect a brake control board when the voltage input by the power input port 7 is higher than 32V, and the principle is shown in figure 2;

the power conversion circuit 2 is used for reducing the voltage of an input power supply of the power input port 7, the power conversion circuit 2 comprises a DC-DC conversion chip 21, a diode 22, a plurality of capacitors 23 and an inductor 24, the model of the DC-DC conversion chip 21 is LM2596S-5.0, the voltage input wide voltage range is 5.5V-40V, 5V is output, and the current is output by 3A, and the principle is shown in FIG. 3;

the standby power supply module 4 is connected with the relay control circuit 51 of the relay module 5 and used for supplying power to the relay module 5 when the power input port 7 is powered off, and a state switching button 6 is connected in series between the standby power supply module 4 and the relay module 5 through a lead and used for switching the connection and disconnection states of the standby power supply module 4 and the relay module 5;

the power conversion circuit 2 is further connected with the standby power module 4 through the lithium battery charging module 3, and is used for charging the standby power module 4 through the overvoltage protection circuit 1 by using the power input port 7, the lithium battery charging module 3 comprises a lithium battery charging management chip 31 and a charging and discharging protection circuit 32, the lithium battery charging management chip 31 adopts a core board with a core of a TC4056 single lithium battery charging management chip, the principle is as shown in fig. 4, the standby power module 4 comprises a lithium battery 41 and a battery holder 42, the lithium battery 41 is connected and arranged in the battery holder 42, the battery holder 42 is connected with the power conversion circuit 2 through the lithium battery charging module 3, the lithium battery 41 is a 1457V battery of 850mah, and the battery holder 42 is a 14500 battery holder of a direct-insert type.

The working principle of the above embodiment is as follows:

and (3) normal operation state: the power input port 7 supplies power to the relay module 5, the relay 52 is electrified and opened, the left relay 521 and the right relay 522 are switched from a normally closed contact to a normally open contact, the UVW three-phase lines of the left brushless motor and the right brushless motor are switched from a mutual short circuit state to a mutual open circuit state, and at the moment, the wheelchair is withdrawn from a braking state and normally runs;

normal shutdown or unexpected power off state: the brake control board is powered off, the electric shocks of the left relay 521 and the right relay 522 are in a normally closed state, the UVW three-phase lines of the left brushless motor and the right brushless motor are mutually short-circuited, and the motors are in a braking state at the moment; when the wheelchair needs to be pushed in a normal shutdown state, the state switching button 6 on the brake control board is only required to be pressed to switch to the standby power supply module 4 for supplying power, at the moment, the standby power supply opens the left relay 521 and the right relay 522, the wheelchair exits from a braking state, the UVW three-phase lines of the left brushless motor and the right brushless motor are switched to a mutual open-circuit state from a mutual short-circuit state, at the moment, the two wheels of the wheelchair are in a free state, the wheelchair can be pushed easily, the wheelchair exits from the free pushing state, the wheelchair can enter the braking state only by pressing the state switching button 6 again, and the purpose of switching the wheelchair from the braking state to the free state is achieved, and the principle is shown in fig. 5.

The specific models of the electronic components are not specially designated, and common products sold in the market can be selected as long as the use requirements of the electronic components can be met.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention are included in the protection scope of the present invention.