External voltage stabilizing circuit of electronic speed regulator

Abstract

This application discloses an external voltage regulator circuit for an electronic speed controller, including a main battery, a secondary battery, a BEC chip, a buck chip, a display screen, an MCU, a temperature detection unit, an operational amplifier, a first overvoltage protection circuit, a second overvoltage protection circuit, a first diode circuit, a second diode circuit, switching transistors Q1-Q6, resistors R1-R6, capacitors C1-C4, and an inductor L. It offers the following advantages: the circuit structure forms a closed-loop control circuit, adjusting the output voltage in real time to ensure stable output voltage when voltage or load changes; the circuit incorporates overvoltage protection and diode circuits to provide overvoltage and reverse cutoff protection for the branch containing the switching transistors; the main battery and secondary battery achieve redundant power supply through the switching transistors and protection circuits, allowing the secondary battery to quickly switch over and operate when the main battery fails, ensuring uninterrupted power supply; and the display screen monitors the temperature, current, and voltage of the BEC chip in real time for convenient control.

Description

Technical Field

[0001] This invention relates to the field of electronic speed controller technology, and more specifically to an external voltage regulator circuit for an electronic speed controller. Background Technology

[0002] The Electronic Speed ​​Controller (ESC) is a key component for controlling motor speed, requiring a stable DC voltage to supply its own control circuitry and peripherals such as receivers and servos. Traditional ESCs often use a built-in Battery Elimination Circuit (BEC) for voltage regulation, but built-in BECs suffer from limitations such as limited output current, poor heat dissipation, and weak anti-interference capabilities. When peripheral power consumption is high or the main battery voltage fluctuates drastically, the built-in BEC is prone to voltage instability and overheating, affecting the normal operation of the ESC and peripherals.

[0003] Furthermore, most existing external voltage regulator circuits lack robust protection mechanisms. When encountering overvoltage, overcurrent, or abnormal temperature conditions, they struggle to respond quickly and take protective measures, potentially leading to circuit damage or equipment malfunction. Additionally, most external voltage regulator circuits cannot monitor output voltage, current, and temperature parameters in real time, making it difficult for users to understand the circuit's operating status and hindering debugging and maintenance.

[0004] Therefore, how to develop an external voltage regulator circuit for an electronic speed controller with stable output, a sound protection mechanism, and condition monitoring capabilities is a technical problem that needs to be solved. Utility Model Content

[0005] Based on this, it is necessary to provide an external voltage regulator circuit for an electronic speed controller to address the existing problems. The circuit includes a main battery, a secondary battery, a BEC chip, a step-down chip, a display screen, an MCU, a temperature detection unit, an operational amplifier, a first overvoltage protection circuit, a second overvoltage protection circuit, a first diode circuit, a second diode circuit, switching transistors Q1, Q2, Q3, Q4, Q5, and Q6, resistors R1, R2, R3, R4, R5, and R6, capacitors C1, C2, C3, and C4, and an inductor L.

[0006] The main battery is connected to the first terminal of the step-down chip and the first terminal of the switching transistor Q1. The second terminal of the switching transistor Q1 is connected to the first terminal of the BEC chip. The third terminal of the switching transistor Q1 is connected to the first terminal of the inductor L and the first terminal of the switching transistor Q2. The second terminal of the switching transistor Q2 is connected to the second terminal of the BEC chip. The third terminal of the switching transistor Q2 is connected to the second terminals of resistor R4, capacitor C1, capacitor C2, capacitor C3, and capacitor C4, and grounded. The second terminal of the step-down chip is connected to the first terminal of the MCU. The second and third terminals of the MCU are connected to the display screen. The fourth terminal of the MCU is connected to the second terminal of resistor R5 and the first terminal of resistor R6. The fifth terminal of the MCU is connected to the first terminal of the operational amplifier. The third terminal of the operational amplifier is connected to the second terminal of the inductor L and the first terminal of resistor R1. The fourth terminal of the operational amplifier is connected to the... The second terminal of resistor R1, the first terminal of resistor R2, and the first terminal of switch Q3 are connected together. The second terminal of switch Q3 is connected to the first terminal of switch Q4. The second terminal of switch Q4 is connected to the second terminal of resistor R6, the first terminals of capacitors C1, C2, C3, and C4, the first terminal of switch Q5, and the output voltage terminal of BEC. The second terminal of switch Q5 is connected to the first terminal of switch Q6. The second terminal of switch Q6 is connected to the auxiliary battery. The third terminal of switch Q3 is connected to the first overvoltage protection circuit. The third terminal of switch Q4 is connected to the first diode circuit. The third terminal of switch Q5 is connected to the second overvoltage protection circuit. The third terminal of switch Q6 is connected to the second diode circuit. The second terminal of resistor R2 is connected to the first terminals of resistors R3 and R4. The second terminal of resistor R3 is connected to the DAC.

[0007] Preferably, the second terminal of the operational amplifier is grounded, and the third terminal is connected to a 3.3V DC power supply.

[0008] Preferably, the display screen is used to display the temperature, current, and voltage of the BEC chip.

[0009] Preferably, the MCU is used to control the temperature, current and voltage of the BEC chip.

[0010] Compared with the prior art, the technical solution disclosed in this utility model has the following beneficial effects:

[0011] (1) Stable and reliable output voltage: The closed-loop control circuit composed of BEC chip, step-down chip, operational amplifier, etc. can adjust the output voltage in real time to ensure that the output voltage remains stable when the main battery voltage fluctuates or the load changes.

[0012] (2) Improved protection mechanism: The circuit is equipped with a first overvoltage protection circuit and a second overvoltage protection circuit, which can respectively provide overvoltage protection and reverse cut-off protection for the branches where the switching transistors Q3, Q4, Q5 and Q6 are located, effectively preventing overvoltage, reverse connection and other faults from damaging the circuit.

[0013] (3) Dual power supply redundancy design: The main battery and the auxiliary battery are redundantly powered through switching transistors Q5 and Q6 and related protection circuits. When the main battery experiences power failure, undervoltage, or other faults, the auxiliary battery can quickly switch to work, ensuring uninterrupted power supply to peripherals. This design greatly improves the reliability of the circuit and is particularly suitable for scenarios with high requirements for power supply continuity.

[0014] (4) Status monitoring and display function: Through the MCU, temperature detection unit and display screen, the temperature, output current and voltage of the BEC chip can be monitored in real time and displayed intuitively on the display screen. Users can use these parameters to keep track of the circuit's working status in a timely manner, which is convenient for debugging and troubleshooting.

[0015] (5) Strong load adaptability: The circuit adopts a high-efficiency DC-DC conversion structure composed of switching transistors, inductors, capacitors, etc., with a conversion efficiency of up to 92% or more (the efficiency of traditional linear voltage regulator circuits is only 60-70%). It can adapt to a wide range of load currents of 0.5-10A to meet the power supply requirements of different peripherals. Attached Figure Description

[0016] The exemplary embodiments of this utility model can be more fully understood by referring to the following accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain the utility model and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 This is a circuit diagram of an external voltage regulator circuit for a resistance speed controller according to an exemplary embodiment of this application. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Reference Figure 1 This application provides an external voltage regulator circuit for an electronic speed controller, including a main battery, a secondary battery, a BEC chip, a step-down chip, a display screen, an MCU, a temperature detection unit, an operational amplifier, a first overvoltage protection circuit, a second overvoltage protection circuit, a first diode circuit, a second diode circuit, switching transistors Q1, Q2, Q3, Q4, Q5, and Q6, resistors R1, R2, R3, R4, R5, and R6, capacitors C1, C2, C3, and C4, and an inductor L.

[0023] Specifically, Q1 and Q2 are external MOSFETs of the BEC chip, used for high-current output of the BEC chip; Q3 is used to shut down when the BEC chip burns out or the BEC circuit outputs an abnormal high voltage, protecting the downstream equipment from burnout due to high voltage; Q4 is used to prevent the BEC from burning out due to incorrect voltage insertion or reverse voltage from the downstream equipment; Q5 has the same function as Q4, and Q6 has the same function as Q3.

[0024] Specifically, the main battery is connected to the first terminal of the step-down chip and the first terminal of the switching transistor Q1. The second terminal of the switching transistor Q1 is connected to the first terminal of the BEC chip. The third terminal of the switching transistor Q1 is connected to the first terminal of the inductor L and the first terminal of the switching transistor Q2. The second terminal of the switching transistor Q2 is connected to the second terminal of the BEC chip. The third terminal of the switching transistor Q2 is connected to the second terminals of resistor R4, capacitor C1, capacitor C2, capacitor C3, and capacitor C4, and grounded. The second terminal of the step-down chip is connected to the first terminal of the MCU. The second and third terminals of the MCU are connected to the display screen. The fourth terminal of the MCU is connected to the second terminal of resistor R5 and the first terminal of resistor R6. The fifth terminal of the MCU is connected to the first terminal of the operational amplifier. The third terminal of the operational amplifier is connected to the second terminal of inductor L and the first terminal of resistor R1. The fourth terminal of the operational amplifier... The second terminal of resistor R1, the first terminal of resistor R2, and the first terminal of switch Q3 are connected. The second terminal of switch Q3 is connected to the first terminal of switch Q4. The second terminal of switch Q4 is connected to the second terminal of resistor R6, the first terminals of capacitors C1, C2, C3, and C4, the first terminal of switch Q5, and the output voltage terminal of the BEC. The second terminal of switch Q5 is connected to the first terminal of switch Q6. The second terminal of switch Q6 is connected to the auxiliary battery. The third terminal of switch Q3 is connected to the first overvoltage protection circuit. The third terminal of switch Q4 is connected to the first diode circuit. The third terminal of switch Q5 is connected to the second overvoltage protection circuit. The third terminal of switch Q6 is connected to the second diode circuit. The second terminal of resistor R2 is connected to the first terminals of resistors R3 and R4. The second terminal of resistor R3 is connected to the DAC. The second terminal of the operational amplifier is grounded, and the third terminal is connected to a 3.3V DC power supply. The display screen shows the temperature, current, and voltage of the BEC chip. The MCU controls the temperature, current, and voltage of the BEC chip.

[0025] Specifically, the BEC chip is simultaneously inserted into the main battery (9-80V) and the auxiliary battery (6-8.4V), and the BEC output supports adjustable voltage from 5-24V; the specific working principle of the circuit is as follows:

[0026] (1) When the power is on, the MCU starts to detect voltage, current and temperature. When these parameters are within the normal range, the MCU outputs a low level on IO-1, Q5 and Q6 are turned off, and the auxiliary battery is not engaged; IO-2 outputs a high level, Q3 and Q4 are turned on, and BEC outputs normally at this time.

[0027] (2) When the op-amp detects that the current exceeds the set value, the MCU's IO-2 goes low and turns off Q3 and Q4; at this time, the MCU's IO-1 goes high, Q5 and Q6 are turned on, the auxiliary battery is connected, and the BEC outputs the auxiliary battery voltage to ensure that the circuit continues to operate.

[0028] (3) The circuit also includes multiple protections such as temperature detection circuit and voltage detection circuit. Once the parameter value set by the MCU is triggered, the MCU's IO-2 outputs a low level, turning off Q3 and Q4; IO-1 outputs a high level, turning on Q5 and Q6, connecting the auxiliary battery, and the BEC outputs the backup battery voltage, so that the back-end load can operate normally.

[0029] (4) An LCD display screen has been added to the circuit, which can display the current temperature, current and voltage of the BEC chip; the BEC voltage supports 5-24V adjustable, and different output voltages can be adjusted by buttons.

[0030] Compared with the prior art, the technical solution disclosed in this utility model has the following beneficial effects:

[0031] (1) Stable and reliable output voltage: The closed-loop control circuit composed of BEC chip, step-down chip, operational amplifier, etc. can adjust the output voltage in real time to ensure that the output voltage remains stable when the main battery voltage fluctuates or the load changes.

[0032] (2) The protection mechanism is complete: the circuit is equipped with a first overvoltage protection circuit, a second overvoltage protection circuit, a first diode circuit and a second diode circuit, which can respectively provide overvoltage protection and reverse cut-off protection for the branches where the switching transistors Q3, Q4, Q5 and Q6 are located, effectively preventing overvoltage, reverse connection and other faults from damaging the circuit.

[0033] (3) Dual power supply redundancy design: The main battery and the auxiliary battery are redundantly powered through switching transistors Q5 and Q6 and related protection circuits. When the main battery experiences power failure, undervoltage, or other faults, the auxiliary battery can quickly switch to work, ensuring uninterrupted power supply to peripherals. This design greatly improves the reliability of the circuit and is particularly suitable for scenarios with high requirements for power supply continuity.

[0034] (4) Status monitoring and display function: Through the MCU, temperature detection unit and display screen, the temperature, output current and voltage of the BEC chip can be monitored in real time and displayed intuitively on the display screen. Users can use these parameters to keep track of the circuit's working status in a timely manner, which is convenient for debugging and troubleshooting.

[0035] (5) Strong load adaptability: The circuit adopts a high-efficiency DC-DC conversion structure composed of switching transistors, inductors, capacitors, etc., with a conversion efficiency of up to 92% or more (the efficiency of traditional linear voltage regulator circuits is only 60-70%). It can adapt to a wide range of load currents of 0.5-10A to meet the power supply requirements of different peripherals.

[0036] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0037] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An external voltage stabilizing circuit for an electronic speed regulator, characterized by comprising: Includes main battery, auxiliary battery, BEC chip, step-down chip, display screen, MCU, temperature detection unit, operational amplifier, first overvoltage protection circuit, second overvoltage protection circuit, first diode circuit, second diode circuit, switching transistors Q1, Q2, Q3, Q4, Q5, Q6, resistors R1, R2, R3, R4, R5, R6, capacitors C1, C2, C3, C4, and inductor L; The main battery is connected to the first terminal of the step-down chip and the first terminal of the switching transistor Q1. The second terminal of the switching transistor Q1 is connected to the first terminal of the BEC chip. The third terminal of the switching transistor Q1 is connected to the first terminal of the inductor L and the first terminal of the switching transistor Q2. The second terminal of the switching transistor Q2 is connected to the second terminal of the BEC chip. The third terminal of the switching transistor Q2 is connected to the second terminals of resistor R4, capacitor C1, capacitor C2, capacitor C3, and capacitor C4, and grounded. The second terminal of the step-down chip is connected to the first terminal of the MCU. The second and third terminals of the MCU are connected to the display screen. The fourth terminal of the MCU is connected to the second terminal of resistor R5 and the first terminal of resistor R6. The fifth terminal of the MCU is connected to the first terminal of the operational amplifier. The third terminal of the operational amplifier is connected to the second terminal of the inductor L and the first terminal of resistor R1. The fourth terminal of the operational amplifier is connected to the... The second terminal of resistor R1, the first terminal of resistor R2, and the first terminal of switch Q3 are connected together. The second terminal of switch Q3 is connected to the first terminal of switch Q4. The second terminal of switch Q4 is connected to the second terminal of resistor R6, the first terminals of capacitors C1, C2, C3, and C4, the first terminal of switch Q5, and the output voltage terminal of BEC. The second terminal of switch Q5 is connected to the first terminal of switch Q6. The second terminal of switch Q6 is connected to the auxiliary battery. The third terminal of switch Q3 is connected to the first overvoltage protection circuit. The third terminal of switch Q4 is connected to the first diode circuit. The third terminal of switch Q5 is connected to the second overvoltage protection circuit. The third terminal of switch Q6 is connected to the second diode circuit. The second terminal of resistor R2 is connected to the first terminals of resistors R3 and R4. The second terminal of resistor R3 is connected to the DAC.

2. The external voltage regulator circuit for an electronic speed controller according to claim 1, characterized in that, The second terminal of the operational amplifier is grounded, and the third terminal is connected to a 3.3V DC power supply.

3. The external voltage stabilizing circuit of an electronic speed regulator according to claim 1, wherein The display screen is used to show the temperature, current, and voltage of the BEC chip.

4. The external voltage stabilizing circuit of an electronic speed regulator according to claim 1, wherein The MCU is used to control the temperature, current, and voltage of the BEC chip.

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