Improved boots boost circuit structure

Abstract

The utility model belongs to voltage control circuit technical field especially relates to an improved boots boost circuit structure. Singlechip U1 produces PWM signal output and gives MOS pipe Q1 in MOS pipe drive circuit and carries out current increase, and MOS pipe Q1 and the cooperation of inductance L1 carry out voltage increase, and the current size and direction adjustment output voltage regulation and feedback circuit, voltage regulation and feedback circuit will receive voltage and carry out voltage division and then access the positive and negative input of operational amplifier U2, finally through the comparison of operational amplifier U2, output feedback signal to the pin of singlechip U1, and singlechip U1 further adjusts the PWM signal to make the output voltage stable. It does not need special boost chip, and voltage is stable, temperature rise is low, efficiency is as high as 90%, convenient to use, low in cost, and can be matched with wider application.

Description

Technical Field

[0001] This utility model belongs to the field of voltage control circuit technology, and in particular relates to an improved boots boost circuit structure. Background Technology

[0002] In the field of portable electronic devices (such as power banks, drones, and wearable devices), boost circuits need to efficiently convert the low battery voltage into a stable high voltage. Traditional solutions generally rely on dedicated boost control chips (such as TI's TPS series and ADI's LT chips), which have significant drawbacks:

[0003] 1. Poor flexibility: Dedicated chip pin functions are fixed, making it difficult to adapt to voltage / current requirements in various scenarios;

[0004] 2. High cost: Integrated chips account for more than 30% of the total circuit cost, putting pressure on the cost-effectiveness of consumer products;

[0005] 3. Complex peripheral circuitry: Requires complex compensation networks and protection circuits, increasing PCB area;

[0006] 4. Response delay: The feedback loop of the dedicated chip is fixed, which is insufficient to adjust the speed when the load changes suddenly.

[0007] While synchronous rectification technology can improve efficiency, its reliance on dedicated controllers further increases costs. Therefore, there is an urgent need for a highly flexible, low-cost, and easily scalable boost converter solution. Utility Model Content

[0008] To address the shortcomings and deficiencies of existing technologies, the purpose of this utility model is to provide a simple, rationally designed, and easy-to-use boots boost circuit structure. It does not require a dedicated boost chip, and features stable voltage, low temperature rise, and efficiency up to 90%. It is easy to use, low in cost, and can be applied to a wider range of applications.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a microcontroller circuit, a MOSFET driver circuit, and a voltage regulation and feedback circuit; the microcontroller U1 in the microcontroller circuit generates a PWM signal and outputs it through pin 13 to the MOSFET Q1 in the MOSFET driver circuit to increase the current; the MOSFET Q1 and inductor L1 work together to boost the voltage and output it to a two-way current control module composed of diode D1, resistor R2, diode D2, and resistor R3. After adjusting the magnitude and direction of the current, the module outputs it to the voltage regulation and feedback circuit. The voltage regulation and feedback circuit divides the received voltage through resistors R13 and R16 and then connects it to the positive input terminal of operational amplifier U2. It then divides the voltage through resistors R12, variable resistor RP1, and R18 and connects it to the inverting input terminal of operational amplifier U2. Finally, after comparison by operational amplifier U2, a feedback signal is output to pin 15 of microcontroller U1. Microcontroller U1 further adjusts the PWM signal to stabilize the output voltage.

[0010] Preferably, the microcontroller circuit is composed of a microcontroller U1, and the microcontroller U1 model is XC8M6601.

[0011] Preferably, the MOSFET Q1 in the MOSFET driving circuit is an N-channel field-effect transistor of model 50N06.

[0012] Preferably, the operational amplifier U2 in the voltage regulation and feedback circuit is an LM321.

[0013] Preferably, the microcontroller circuit, MOSFET drive circuit, voltage regulation and feedback circuit constitute a closed-loop regulation system to achieve stable voltage control.

[0014] The beneficial effects of this utility model after adopting the above structure are as follows:

[0015] 1. Significantly reduces cost and circuit complexity; it replaces dedicated chips, directly driving MOSFETs through PWM signals output by a microcontroller, and constructs dynamic feedback by combining general-purpose operational amplifiers, eliminating the need for a dedicated Boost controller; it simplifies peripheral circuits: the feedback network only requires voltage divider resistors and compensation capacitors, reducing the number of components by 40% compared to the multi-stage RC network required by dedicated chips.

[0016] 2. Fast dynamic response and high voltage accuracy:

[0017] It adopts dual closed-loop control: voltage loop: the output voltage is input to the non-inverting input of the operational amplifier through a voltage divider and compared with the reference voltage at the inverting input in real time, and the error signal is directly fed to the microcontroller; current loop: the sampling resistor detects the MOS current, and the microcontroller dynamically limits the PWM duty cycle.

[0018] 3. Strong scalability and flexibility:

[0019] Multi-scenario adaptation: The microcontroller program can dynamically adjust the PWM frequency / duty cycle, supporting a wide output range of 3V-30V;

[0020] Open interface: The reserved I²C interface supports peripheral communication, which facilitates the integration of intelligent control systems. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, this utility model will be described in detail below with reference to the specific implementation and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the microcontroller circuit 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the MOS transistor driving circuit 2 of this utility model;

[0024] Figure 3 This is a schematic diagram of the voltage regulation and feedback circuit 3 of this utility model;

[0025] Figure labeling: 1. Microcontroller circuit; 2. MOSFET drive circuit; 3. Voltage regulation and feedback circuit. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0027] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0028] See Figures 1-3As shown, this specific embodiment adopts the following technical solution: It includes a microcontroller circuit 1, a MOSFET driver circuit 2, and a voltage regulation and feedback circuit 3; the microcontroller U1 of the microcontroller circuit 1 generates a PWM signal and outputs it through pin 13 to the MOSFET Q1 in the MOSFET driver circuit 2 to increase the current; the MOSFET Q1 and the inductor L1 work together to boost the voltage and output it to a two-way current control module composed of diode D1, resistor R2, diode D2, and resistor R3. After adjusting the magnitude and direction of the current, the module outputs it to the voltage regulation and feedback circuit 3. The voltage regulation and feedback circuit 3 divides the received voltage through resistors R13 and R16 and then connects it to the positive input terminal of operational amplifier U2. It divides the voltage through resistors R12, variable resistor RP1, and R18 and then connects it to the inverting input terminal of operational amplifier U2. Finally, after comparison by operational amplifier U2, a feedback signal is output to pin 15 of microcontroller U1. Microcontroller U1 further adjusts the PWM signal to stabilize the output voltage.

[0029] The microcontroller circuit 1 is composed of a microcontroller U1, model XC8M6601; the MOSFET Q1 in the MOSFET driver circuit 2 is an N-channel field-effect transistor of model 50N06; the operational amplifier U2 in the voltage regulation and feedback circuit 3 is model LM321; the microcontroller circuit 1, the MOSFET driver circuit 2, and the voltage regulation and feedback circuit 3 form a closed-loop regulation system to complete voltage stabilization control.

[0030] The working principle of this specific implementation is as follows: The microcontroller U1 generates a PWM signal to drive the MOSFET Q1, which increases the current through the inductor. At this time, the potential of the inductor L1 is positive at the top and negative at the bottom. When the MOSFET Q1 is turned off by the PWM low-level signal, the induced electromotive force on the inductor L1 is superimposed with the input power supply voltage, which is boosted. This boosted voltage is then fed to the electrolytic capacitor CE1 through diodes D1 and D2, resistors R3 and R2, and provides energy to the load. The output voltage is divided by resistors R13 and R16 and then connected to the positive input of the comparator. It is also divided by resistors R12, RP1, and R18 and then connected to the inverting input. When the output voltage reaches the preset value, the operational amplifier U2 outputs a high-level feedback signal to the microcontroller U1. The microcontroller U1 calculates and processes the PWM signal to stabilize the output voltage. The microcontroller U1 adjusts the maximum current of the MOSFET through the current sampling resistors R11 and R10, making the entire system circuit more stable and efficient.

[0031] The specific implementation method of this invention has the following advantages: it solves the three major pain points of dedicated boost chips: high cost, poor flexibility, and slow response. It is particularly suitable for the consumer electronics field, which is sensitive to cost and requires rapid iteration. The actual measured comprehensive cost is reduced by 30% and the efficiency reaches 90-92%, which has significant industrialization value.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An improved boots boost circuit structure, characterized in that: It includes a microcontroller circuit, a MOSFET driver circuit, and a voltage regulation and feedback circuit. The microcontroller U1 generates a PWM signal, which is output through pin 13 to the MOSFET Q1 in the MOSFET driver circuit to increase the current. The MOSFET Q1, in conjunction with inductor L1, boosts the voltage and outputs it to a two-channel current control module composed of diode D1, resistor R2, diode D2, and resistor R3. This module adjusts the current magnitude and direction before outputting it to the voltage regulation and feedback circuit. The voltage regulation and feedback circuit divides the received voltage through resistors R13 and R16 and then connects it to the positive input of operational amplifier U2. It then divides the voltage through resistors R12, RP1, and R18 and connects it to the inverting input of operational amplifier U2. Finally, the operational amplifier U2 compares the voltage and outputs a feedback signal to pin 15 of microcontroller U1. Microcontroller U1 further adjusts the PWM signal to stabilize the output voltage.

2. The improved boots boost circuit structure according to claim 1, characterized in that: The aforementioned microcontroller circuit consists of microcontroller U1. The microcontroller U1 is model XC8M6601.

3. The improved boots boost circuit structure according to claim 1, characterized in that: The MOSFET Q1 in the MOSFET driving circuit is an N-channel field-effect transistor of model 50N06.

4. The improved boots boost circuit structure according to claim 1, characterized in that: The operational amplifier U2 in the voltage regulation and feedback circuit is an LM321.

5. The improved boots boost circuit structure according to claim 1, characterized in that: The aforementioned microcontroller circuit, MOSFET drive circuit, voltage regulation and feedback circuit constitute a closed-loop regulation system that completes voltage stabilization control.

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