Novel brake control circuit for improved range

Abstract

The utility model discloses a novel brake control circuit that improves the driving range, a battery power input and a large current voltage reduction chip 3 foot electricity are connected, the coil type brake is connected with the large current voltage reduction chip 5 foot electricity after the series 1 inductance, the second end of coil type brake and field effect tube drain electrode electricity are connected, the large current voltage reduction chip 1 foot and triode collector electricity are connected, triode base series 4th resistance and brake failure lamp power supply positive electrode electricity are connected after that, field effect tube gate and triode collector electricity are connected, triode base series 7th resistance and brake lamp terminal electricity are connected after that, triode emitter and N channel field effect tube source and brake failure lamp power supply negative electrode electricity are connected. Brake is full voltage attraction before brake ware starts 10S, and after absorbing more than 10S, the voltage is reduced to 15V. Brake voltage effective sustainable operation can improve battery endurance capacity, improve user experience and improve the driving range.

Description

Technical Field

[0001] This utility model relates to an electric mobility scooter or electric wheelchair, and more particularly to a novel brake control circuit for use in an electric mobility scooter or electric wheelchair to increase driving range. Background Technology

[0002] With the continuous technological advancements in electric mobility scooters and wheelchairs, these vehicles have gained widespread acceptance and use. However, current electric mobility scooters and wheelchairs utilize portable battery power solutions. By equipping these vehicles with rechargeable portable batteries, users can not only directly charge the entire vehicle when it is low on power, but also remove the portable battery for charging at home or work. Once fully charged, the portable battery can be reinstalled, ensuring power for the next leg of the journey. However, the energy storage capacity of these portable batteries is limited. Therefore, improving the reliable and efficient utilization of this limited energy not only enhances the user experience but also reduces development costs and lowers overall vehicle power consumption. Utility Model Content

[0003] This invention addresses the limitations of existing electric mobility scooters or electric wheelchairs, which suffer from limited battery power and hinder user experience. It provides a novel brake control circuit that increases battery capacity and improves driving range by enhancing the user experience of existing electric mobility scooters or electric wheelchairs' mobile batteries.

[0004] The specific technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a novel brake control circuit for improving driving range, including a coil brake and a battery power input port, characterized in that: a high-current step-down chip of model MP9486A is used; the battery power input port is electrically connected to the third function VIN pin of the high-current step-down chip; the first end of the coil brake is connected in series with the first end of the first inductor and then electrically connected to the fifth function SW pin of the high-current step-down chip; the second end of the coil brake is electrically connected to the drain of an N-channel MOSFET; simultaneously, a first Zener diode and an RC series circuit are connected in parallel between the second end of the first inductor and the power ground; the anode of the first Zener diode is connected to the power ground. Electrical connections: The 7th function EN pin of the high-current step-down chip is connected in series with the 7th resistor and then electrically connected to the Brake_VDD_EN function pin of the microcontroller's I / O serial port. The 1st function pin of the high-current step-down chip is electrically connected to the collector of the 9th NPN transistor. The base of the 9th NPN transistor is connected in series with the 4th resistor and then electrically connected to the positive power supply terminal of the Brake-15V function pin of the microcontroller's I / O serial port. The emitter of the 9th NPN transistor is connected in series with the 3rd resistor and then, together with the emitter, is electrically connected to the negative power supply terminal of the brake malfunction lamp. The gate of the N-channel MOSFET is electrically connected to the collector of the 1st NPN transistor. The base of the 1st NPN transistor is connected in series with the 7th resistor and then electrically connected to the C_Break EN function pin terminal of the microcontroller's I / O serial port. The emitter of the 1st NPN transistor and the source of the N-channel MOSFET are both electrically connected to the negative power supply terminal of the brake malfunction lamp. The collector of the 1st NPN transistor is connected in series with the 8th resistor and then electrically connected to the +15V power supply. It can increase battery capacity and improve user experience by extending the driving range based on the mobile batteries of existing electric mobility scooters or electric wheelchairs.

[0005] Preferably, the N-channel MOSFET is an N-channel enhancement-type MOSFET of model NCE0110K. This improves the simplicity, stability, reliability, and effectiveness of the N-channel MOSFET's operation.

[0006] Preferably, the C_Break EN function pin of the microcontroller I / O serial port is connected to a +3.3V power supply after being connected in series with a sixth resistor. This improves the stability, reliability, and effectiveness of the brake light operation.

[0007] Preferably, the first functional pin of the high-current buck chip is connected in series with an RC parallel circuit and then electrically connected to the first terminal of the coil brake. The RC parallel circuit is composed of a first resistor and a first capacitor connected in parallel. A capacitor (115) and a capacitor (116) are connected in parallel between the first terminal of the coil brake and the negative terminal of the power supply. The fourth functional pin (BST) of the high-current buck chip is connected in series with a second capacitor and then electrically connected to the second terminal of the first inductor. The seventh functional pin (EN) of the high-current buck chip is connected in series with a sixth resistor and then electrically connected to the power supply ground. The ninth functional pin (EP) of the high-current buck chip is electrically connected to the power supply ground. This improves the simplicity, stability, reliability, and effectiveness of the high-current buck chip in this solution.

[0008] Preferably, when the electric wheelchair is in standby mode, the brake control circuit of the coil brake is in a stopped state; during the first 10 seconds of riding, the brake control circuit is in an active state, and the brake control voltage is the power battery voltage; after 10 seconds of riding, the brake control circuit is active again, and the brake control voltage switches to 15V. This improves the simplicity, reliability, and effectiveness of controlling battery energy consumption in different states of the electric wheelchair using the coil brake.

[0009] The beneficial effects of this invention are: the brake engages at full voltage for 10 seconds before activation, and after absorbing voltage for more than 10 seconds, the voltage drops to 15V. This effective voltage maintenance allows for continuous operation of the brake, increasing battery capacity and improving user experience by extending the driving range of existing electric mobility scooters or wheelchairs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the circuit structure of a novel brake control circuit for improving driving range.

[0011] Figure 2 This is a schematic diagram summarizing the results of comparing the braking power consumption of the novel brake control circuit for improving driving range in different working modes of an electric wheelchair. Detailed Implementation

[0012] Figure 1 , Figure 2In the illustrated embodiment, a novel brake control circuit for improving driving range includes a coil brake and a battery power input port BI. It employs a high-current step-down chip U16 (MP9486A). The battery power input port BI is electrically connected to the third function pin (VIN) of the high-current step-down chip U16. The first terminal of the coil brake BC is connected in series with the first terminal of the first inductor L1 and then electrically connected to the fifth function pin (SW) of the high-current step-down chip U16. The second terminal of the coil brake BC is electrically connected to the drain of the N-channel MOSFET TR3. Simultaneously, the first inductor L1... The second terminal is connected in parallel with the power supply ground, consisting of a first Zener diode D1 and an RC series circuit. The RC series circuit is formed by a third capacitor and a fifth resistor connected in series. One end of the third capacitor is electrically connected to the cathode of the first Zener diode D1, and the other end is connected in series with the fifth resistor. The anode of the first Zener diode D1 is electrically connected to the power supply ground. The 7th function EN pin of the high-current step-down chip U16 is connected in series with the 7th resistor R7 and then connected to the Brake_VDD_EN function pin of the microcontroller's I / O serial port via Brake_VDD_EN, Brake_15V, and C_Break. The three function pins EN are defined as the high and low level output interfaces of the microcontroller's I / O pins. Different high and low levels control the brake power supply and activate the brake switch. The microcontroller model used must have the aforementioned I / O function pins, such as the CKS32F103RCT6LQFP-64. The first function pin of the high-current step-down chip U16 is electrically connected to the collector of the 9th NPN transistor Q9. The base of the 9th NPN transistor Q9, connected in series with the 4th resistor R4, is electrically connected to the Brake-15V function pin of the microcontroller's I / O serial port. The emitter of the 9th NPN transistor Q9, connected in series with the 3rd resistor R3, is also electrically connected to the negative terminal of the brake malfunction indicator lamp's power supply. The gate of the N-channel MOSFET TR3 is electrically connected to the collector of the 1st NPN transistor Q1. The base of the 1st NPN transistor Q1, connected in series with the 7th resistor R7, is connected to the C_Break pin of the microcontroller's I / O serial port. The EN function pin is electrically connected. The emitter of the first NPN transistor Q1 and the source of the N-channel MOSFET TR3 are both electrically connected to the negative terminal of the power supply for the brake malfunction indicator lamp. The collector of the first NPN transistor Q1 is connected in series with resistor R8 (model 8) and then electrically connected to the +15V power supply. This 15V power supply is a linearly regulated power supply used to drive the MOSFET, ensuring that the MOSFET operates in switching mode. The N-channel MOSFET TR3 is an N-channel enhancement-type MOSFET, model NCE0110K. The microcontroller I / O serial port C_Break EN function pin is connected in series with resistor R6 (model 6) and then electrically connected to the +3.3V power supply.The first functional pin of the high-current step-down chip U16 is connected in series with an RC parallel circuit and then electrically connected to the first terminal of the coil brake. The RC parallel circuit is composed of the first resistor R1 and the first capacitor C1 connected in parallel. The first terminal of the coil brake BC is connected in parallel with the 115 capacitor C115 and the 116 capacitor C116. The 115 and 116 capacitors are output filter capacitors, which play a role in stabilizing the output voltage. The fourth functional pin of the high-current step-down chip U16 is connected in series with the second capacitor and then electrically connected to the second terminal of the first inductor. The seventh functional pin of the high-current step-down chip EN is connected in series with the sixth resistor and then electrically connected to the power supply ground. The ninth functional pin of the high-current step-down chip EP is connected to the power supply ground. When the electric wheelchair is in standby mode, the brake control circuit of the coil brake BC is in a stopped state. During the first 10 seconds of riding, the brake control circuit is in a working state, and the brake control voltage is the power supply battery voltage. After 10 seconds of riding, the brake control circuit is in a working state, and the brake control voltage switches to 15V. It is set to L level through the microcontroller IO port (Brake_15V). Resistor R2 is not shorted, and FB provides the corresponding voltage feedback. The MP9486A outputs SW-L1 as 15V.

[0013] Energy-saving design scheme for coil brakes in electric mobility scooters and electric wheelchairs: The control system ensures the brake is fully engaged within 10 seconds of activation, and after 10 seconds, the voltage is maintained at 15V. Because the brake's voltage maintenance is effective, continuous operation is possible.

[0014] In the description of the positional relationship in this utility model, terms such as "inner", "outer", "upper", "lower", "left", and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] The above content and structure describe the basic principles, main features, and advantages of this utility model, which should be understood by those skilled in the art. The examples and descriptions above are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel brake control circuit for improving driving range, comprising a coil brake and a battery power input port, characterized in that: A high-current step-down chip, model MP9486A, is used. The battery power input port is electrically connected to the third function pin (VIN) of the high-current step-down chip. The first end of the coil brake is connected in series with the first end of the first inductor and then electrically connected to the fifth function pin (SW) of the high-current step-down chip. The second end of the coil brake is electrically connected to the drain of an N-channel MOSFET. Simultaneously, a first Zener diode and an RC series circuit are connected in parallel between the second end of the first inductor (connected in series) and the power ground. The anode of the first Zener diode is electrically connected to the power ground. The seventh function pin (EN) of the high-current step-down chip is connected in series with a seventh resistor and then connected to the microcontroller I / O pin. The Brake_VDD_EN function pin of the serial port is electrically connected. The first function pin of the high-current step-down chip is electrically connected to the collector of the 9th NPN transistor. The base of the 9th NPN transistor, connected in series with the 4th resistor, is electrically connected to the positive power supply of the Brake-15V function pin of the microcontroller's I / O serial port. The emitter of the 9th NPN transistor, connected in series with the 3rd resistor, is connected to the negative power supply of the brake malfunction lamp. The gate of the N-channel MOSFET is electrically connected to the collector of the 1st NPN transistor. The base of the 1st NPN transistor, connected in series with the 7th resistor, is electrically connected to the C_Break EN function pin of the microcontroller's I / O serial port. The emitter of the 1st NPN transistor and the source of the N-channel MOSFET are both electrically connected to the negative power supply of the brake malfunction lamp. The collector of the 1st NPN transistor, connected in series with the 8th resistor, is electrically connected to the +15V power supply.

2. The novel brake control circuit for improving driving range according to claim 1, characterized in that: The N-channel field-effect transistor is an N-channel enhancement-type MOSFET of model NCE0110K.

3. The novel brake control circuit for improving driving range according to claim 1, characterized in that: The microcontroller's I / O serial port C_Break EN function pin is connected to a +3.3V power supply via a 6th resistor connected in series.

4. The novel brake control circuit for improving driving range according to claim 1, characterized in that: The first functional pin of the high-current step-down chip is connected in series with an RC parallel circuit and then electrically connected to the first terminal of the coil brake. The RC parallel circuit is composed of a first resistor and a first capacitor connected in parallel. The first terminal of the coil brake is connected in parallel with capacitors 115 and 116. The fourth functional pin of the high-current step-down chip is connected in series with a second capacitor and then electrically connected to the second terminal of the first inductor. The seventh functional pin of the high-current step-down chip is connected in series with a sixth resistor and then electrically connected to the power supply ground. The ninth functional pin of the high-current step-down chip is connected to the power supply ground.

5. The novel brake control circuit for improving driving range according to claim 1, characterized in that: When the electric wheelchair is in standby mode, the brake control circuit of the coil brake is in a stopped state; when the electric wheelchair is in motion for 10 seconds, the brake control circuit is in a working state, and the brake control voltage is the power supply battery voltage; after the electric wheelchair is in motion for 10 seconds, the brake control circuit is in a working state, and the brake control voltage switches to 15V.

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