CN214544158U

CN214544158U - Brushless controller of electric bicycle

Info

Publication number: CN214544158U
Application number: CN202120883790.8U
Authority: CN
Inventors: 邵正贤
Original assignee: Nanjing Talent Electronics Co ltd
Current assignee: Nanjing Talent Electronics Co ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2021-10-29
Anticipated expiration: 2031-04-27

Abstract

The utility model relates to an electric motor car field especially relates to an electric bicycle brushless controller: it includes a circuit system operatively connected between the brake crank and the brushless motor; a fet Q1 operatively connected to the main power supply and the circuitry, said fet Q1 also operatively connected to the main power supply and the electric door lock; the field effect transistor Q1 is used for controlling the on-off of the main power supply and the circuit system according to the switching signal of the electric door lock. The utility model discloses when the electric door lock breaks off, the electric door lock has closed main power source and circuit system's hookup through field effect transistor, has cut off the energy that arouses the conflagration, prevents to take place the conflagration.

Description

Brushless controller of electric bicycle

Technical Field

The utility model relates to an electric motor car field especially relates to an electric bicycle brushless controller.

Background

The frequent fire accidents of the electric bicycle cause serious property damage of people. Most of electric bicycles in the society at present adopt lead-acid storage batteries, and the lead-acid storage batteries do not generate explosion and combustion phenomena no matter the lead-acid storage batteries are used or singly charged, so that the lead-acid storage batteries are the safest and most widely applied chemical batteries in all storage battery types.

The frequent fire accident of product on electric bicycle is not that charger and lead acid battery cause, but electric bicycle's electrical system has serious defect, when closing electric door lock promptly, does not cut off the main circuit of battery, and the battery links together with circuitry all the time, can lead to like this: (1) when a user rides the electric bicycle, when the user finds that the electric bicycle is internally provided with abnormal short circuit (smoking, scorching smell and the like), the power supply of the circuit cannot be cut off, and only when the user sees that the electric bicycle is on fire and burns, the user moves slowly and even is injured; (2) when the electric bicycle is charged, the highest charging voltage of the battery is about 20% higher than the rated working voltage of the battery, electronic components in an electric system bear the voltage 20% higher than the rated voltage, the probability of early failure of the semiconductor components is increased, the semiconductor components are easy to break through, and accordingly a power supply is short-circuited to form a fire disaster, and the occurrence of the fire accident is often proved to be enough when the electric bicycle is charged.

Referring to fig. 2, in the electric bicycle in the present society, a brushless motor is used, in an electric bicycle controller, an electric door lock is connected to an operation circuit in the controller, a main power supply is always connected to a circuit in the controller, the electric door lock is a weak current circuit for closing an operation part, the main power supply and the circuit are not cut off, the whole electric bicycle is always in a charged state, and a fire disaster is easily caused.

Disclosure of Invention

The utility model aims at providing an electric bicycle brushless controller prevents that electric bicycle from taking place the conflagration.

For solving the above technical problem, the technical scheme of the utility model is that: a brushless controller of an electric bicycle is used for controlling a main power supply to drive a brushless motor according to a signal of a rotating brake handle, and is also connected with an electric door lock; the controller includes:

a circuit system operatively connected between the brake crank and the brushless motor;

a fet Q1 operatively connected to the main power supply and the circuitry, said fet Q1 also operatively connected to the main power supply and the electric door lock; the field effect transistor Q1 is used for controlling the on-off of the main power supply and the circuit system according to the switching signal of the electric door lock.

Furthermore, the grid of the field effect transistor Q1 is connected with the positive electrode of the main power supply after being connected with the electric door lock in series, and the source of the field effect transistor Q1 is connected with the negative electrode of the main power supply; the drain electrode of the field effect transistor Q1 is connected with the negative electrode of the output of the circuit system, and the positive electrode of the input of the circuit system is connected with the positive electrode of the main power supply; when the electric door lock of the utility model is disconnected, the grid electrode of the field effect transistor has no voltage, the source electrode and the drain electrode of the field effect transistor are cut off, the output negative electrode of the circuit system and the negative electrode of the main power supply are not conducted, the circuit system and the main power supply do not form a closed loop, the circuit system is not connected with the main power supply, and the circuit system does not work; when the electric door lock is closed, the grid electrode of the field effect tube generates high level, the source electrode and the drain electrode of the field effect tube are conducted, the output cathode of the circuit system is conducted with the cathode of the main power supply, and the circuit system works.

Further, the controller further comprises a pull-down resistor R1, wherein one end of the pull-down resistor R1 is connected to the gate of the fet Q1, and the other end is connected to the source of the fet Q1; the field effect transistor is a voltage control element, and the ideal field effect transistor basically has no current between a grid electrode and a source electrode as long as the voltage is controlled; the gate and the source are insulated, so that the resistance value between the gate and the source of the field effect transistor is very large, so that very high voltage can be generated at two ends of an equivalent capacitor between the gate and the source only by a small amount of static electricity, and if the small amount of static electricity is not discharged in time, the high voltage at two ends of the equivalent capacitor can cause the field effect transistor to generate misoperation and even break down the gate and the source; at this time, the pull-down resistor R1 added between the gate and the source can discharge the static electricity, prevent the field effect transistor from generating misoperation, ensure that the field effect transistor is in a cut-off state when no input signal (namely suspension) exists, and thus play a role in protecting the field effect transistor.

Further, the controller also comprises a current limiting resistor R2, wherein the current limiting resistor R2 is connected between the electric door lock and the grid electrode of the field effect transistor Q1 in series; the current limiting resistor R2 prevents the transient input voltage transitions from causing excessive gate current that could damage the fet.

Further, the field effect transistor is an N-channel junction field effect transistor.

Furthermore, the controller comprises a shell, a circuit board is arranged in the shell, and the circuit system and the field effect transistor are integrated on the circuit board.

The utility model discloses following beneficial effect has:

the utility model is provided with a field effect transistor which is connected with a main power supply and a circuit system, and the field effect transistor is also operatively connected with the main power supply and a switch lock; the grid of the field effect tube is connected with the electric door lock in series and then is connected with the positive electrode of the main power supply, and the source electrode of the field effect tube is connected with the negative electrode of the main power supply; the drain electrode of the field effect transistor is connected with the output cathode of the circuit system, and the input anode of the circuit system is connected with the anode of the main power supply; the field effect tube is used for controlling the on-off of the main power supply and the circuit system according to the switching signal of the electric door lock; when the electric door lock of the utility model is disconnected, the grid electrode of the field effect transistor has no voltage, the source electrode and the drain electrode of the field effect transistor are cut off, the output negative electrode of the circuit system and the negative electrode of the main power supply are not conducted, the circuit system and the main power supply do not form a closed loop, the circuit system is not connected with the main power supply, and the circuit system does not work; when the electric door lock is closed, the grid electrode of the field effect tube generates high level, the source electrode and the drain electrode of the field effect tube are conducted, the output cathode of the circuit system is conducted with the cathode of the main power supply, and the circuit system works; when the electric door lock of the utility model is disconnected, the energy source causing fire is cut off, and the fire is prevented;

two, the utility model discloses well field effect transistor is integrated on the current circuit board of circuit system and installs in the controller casing, and simple structure need not other device, breaks off the electric lock door and can break off main power supply and circuit system, the operation of being convenient for.

Thirdly, the utility model discloses a field effect transistor is as switching element, is a contactless switch when field effect transistor is as switching element, and contactless switch does not have movable contact part, and it accomplishes to switch on and damps in the PN junction inside, does not appear electric arc or spark when switching on and shutting off, has compensatied the contact switch and has had the not enough of spark when compounding, avoids appearing the spark or puncturing the air in the high voltage circuit because of the electric current is too big, causes the malfunction; the utility model provides a field effect transistor action is rapid, and the reliability is high, is fit for special environment such as fire prevention, explosion-proof, dampproofing and uses.

Drawings

Fig. 1 is a schematic view of the overall structure of an embodiment of the present invention;

fig. 2 is a schematic diagram of a conventional controller structure.

Reference numerals: 1. circuitry; 2. a field effect transistor switching circuit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the present invention relates to a brushless controller for an electric bicycle, which prevents fire of the electric bicycle, the controller is used for controlling a main power supply to drive a brushless motor according to a signal of a brake lever, and the controller is further connected with an electric door lock; the controller includes circuitry 1 and a fet Q1.

The circuit system 1 is operatively connected between the brake crank and the brushless motor; the circuit system 1 adopts a control circuit in the existing electric vehicle controller and a power driving circuit connected to the output end of the control circuit, the control circuit is electrically connected to the rotating brake handle to obtain a control signal, and the power driving circuit is electrically connected to the brushless motor for driving the brushless motor according to the control signal.

A fet Q1 is operatively connected to the mains power supply and the circuitry 1, the fet Q1 also being operatively connected to the mains power supply and the electric door lock; the field effect transistor Q1 is used for controlling the on-off of the main power supply and the circuit system 1 according to the switching signal of the electric door lock; a grid G of the field-effect tube Q1 is connected with the electric door lock in series and then is connected with the positive electrode of the main power supply, and a source S of the field-effect tube Q1 is connected with the negative electrode of the main power supply; the drain D of the field effect transistor Q1 is connected to the negative output terminal of the circuit system 1, and the positive input terminal of the circuit system 1 is connected to the positive main power supply terminal. When the electric door lock of the utility model is disconnected, the grid G of the field effect transistor has no voltage, the source S and the drain D of the field effect transistor are cut off, the output negative pole of the circuit system 1 and the negative pole of the main power supply are not conducted, the circuit system 1 and the main power supply do not form a closed loop, the circuit system 1 is not connected with the main power supply, and the circuit system 1 does not work; when the electric door lock is closed, the grid G of the field effect transistor Q1 generates a high level, the source S and the drain D of the field effect transistor Q1 are conducted, the output negative electrode of the circuit system 1 and the negative electrode of the main power supply are conducted, and the circuit system 1 works. The utility model discloses a when electric door lock disconnection, cut off the energy that arouses the conflagration, prevented to take place the conflagration.

In this embodiment, the controller further includes a pull-down resistor R1 and a current-limiting resistor R2, and the field-effect transistor Q1, the pull-down resistor R1 and the current-limiting resistor R2 constitute a field-effect transistor switching circuit 2; one end of the pull-down resistor R1 is connected with the grid G of the field-effect transistor Q1, and the other end of the pull-down resistor R1 is connected with the source S of the field-effect transistor Q1, so that the field-effect transistor Q1 is in a cut-off state when no input signal (namely, suspension) exists, and the effect of protecting the field-effect transistor Q1 is achieved; the current limiting resistor R2 prevents the gate G current from being excessive and damaging the fet Q1 at the instant of input voltage transition.

In this embodiment, the fet is an N-channel junction fet.

In the embodiment, the controller further comprises a shell, a circuit board is arranged in the shell, and the circuit system 1 and the field effect transistor switch circuit 2 are integrated on the circuit board; the field effect transistor switch circuit 2 is integrated on the original circuit board of the circuit system 1 and is arranged in the controller shell, the structure is simple, and no other device is needed.

The utility model discloses the part that does not relate to all is the same with prior art or adopts prior art to realize.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A brushless controller of an electric bicycle is used for controlling a main power supply to drive a brushless motor according to a signal of a rotating brake handle, and is also connected with an electric door lock; characterized in that the controller comprises:

2. The brushless controller for an electric bicycle of claim 1, wherein: the grid of the field effect transistor Q1 is connected with the electric door lock in series and then is connected with the positive electrode of the main power supply, and the source electrode of the field effect transistor Q1 is connected with the negative electrode of the main power supply; the drain of the field effect transistor Q1 is connected to the negative terminal of the circuitry output, and the positive terminal of the circuitry input is connected to the positive terminal of the main power supply.

3. The brushless controller for an electric bicycle of claim 1, wherein: the controller further comprises a pull-down resistor R1, wherein one end of the pull-down resistor R1 is connected to the grid of the field effect transistor Q1, and the other end of the pull-down resistor R1 is connected to the source of the field effect transistor Q1.

4. The brushless controller for electric bicycle according to claim 2 or 3, wherein: the controller also comprises a current limiting resistor R2, and the current limiting resistor R2 is connected between the electric door lock and the grid electrode of the field effect transistor Q1 in series.

5. The brushless controller for an electric bicycle of claim 1, wherein: the field effect transistor Q1 is an N-channel junction field effect transistor.

6. The brushless controller for an electric bicycle of claim 1, wherein: the controller comprises a shell, a circuit board is arranged in the shell, and the circuit system and the field effect transistor Q1 are integrated on the circuit board.