Small cell boost control and isolation circuit
Patent Information
- Application Number
- CN202522508612.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-26
AI Technical Summary
The existing small battery boost circuit has poor control reliability. The boost enable pin is kept on for a long time, which causes the small battery to drain too quickly. The microcontroller fails to activate the boost control in time after detecting that the battery is de-energized.
A small battery boost control and isolation circuit was designed, including a boost circuit, a boost control chip, a second MOSFET, and a power converter. The boost control chip directly detects the low voltage of the battery and controls the boost circuit to enable it, ensuring that the boost can still be effectively controlled when the microcontroller cannot output a control signal.
The control reliability of the small battery boost circuit is improved, avoiding the problem of the small battery consuming too much power over a long period of time, and providing timely voltage support when the battery fails, thereby improving the power supply reliability of the microcontroller.
Smart Images
Figure CN224935389U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of control circuits, and in particular to a small battery boost control and isolation circuit. Background Technology
[0002] Vehicles typically have a battery that powers a microcontroller, enabling smooth data transmission between the microcontroller and other devices (such as uploading vehicle data). To ensure the microcontroller continues to function even in the event of a battery failure, a smaller battery (with a smaller capacity) can be used to power the microcontroller. This requires a corresponding boost circuit to boost the voltage of the smaller battery. In existing technologies, the control pins of the boost circuit are connected to the microcontroller, and the microcontroller outputs control signals to the control pins of the boost circuit to achieve boost enable control. However, this method has two drawbacks: 1. If the microcontroller keeps the boost enable pin constantly active, the smaller battery will be constantly consuming power, significantly shortening its lifespan; 2. If the microcontroller detects a battery power failure before enabling the boost, the microcontroller may have already lost power but has not yet activated the boost control. Therefore, the current technology for enabling the boost circuit of the smaller battery suffers from poor reliability. Utility Model Content
[0003] This utility model provides a small battery boost control and isolation circuit, which aims to solve the problem of poor control reliability in the enable control of small battery boost circuits in the prior art.
[0004] This utility model discloses a small battery boost control and isolation circuit, wherein the small battery boost control and isolation circuit includes a boost circuit, a boost control chip, a second MOSFET, and a power converter; The positive terminal of the boost circuit is connected to the positive terminal of the small battery, and the negative terminal of the boost circuit is connected to the negative terminal of the small battery. The enable control terminal of the boost control chip is connected to the enable signal terminal of the boost circuit. The output terminal of the boost circuit is connected to the drain of the second MOSFET. The control output terminal of the boost control chip is connected to the gate of the second MOSFET. The source of the second MOSFET and the power supply terminal of the battery are both connected to the input terminal of the power converter. The output terminal of the power converter is connected to the input terminal of the microcontroller. The power supply terminal of the battery is connected to the detection terminal of the microcontroller. The control terminal of the microcontroller and the power supply terminal of the battery are respectively connected to the two signal input terminals of the boost control chip.
[0005] The small battery boost control and isolation circuit mentioned above, wherein the second MOS transistor is a P-MOS transistor.
[0006] The small battery boost control and isolation circuit includes a first inductor, a first MOSFET, a first diode, a first capacitor, and a first resistor. One end of the first inductor serves as the positive terminal of the boost circuit, and the other end of the first inductor is connected to the drain of the first MOSFET and the positive terminal of the first diode; the negative terminal of the first diode is connected to one end of the first capacitor and one end of the first resistor, and the connection point serves as the output terminal of the boost circuit. The source of the first MOS transistor is connected to the other end of the first resistor and the other end of the first capacitor, and the connection point serves as the negative terminal of the boost circuit and is grounded; the gate of the first MOS transistor serves as the enable signal terminal of the boost circuit.
[0007] In the small battery boost control and isolation circuit, the first MOS transistor is a P-MOS transistor.
[0008] The small battery boost control and isolation circuit further includes a second diode; The positive terminal of the second diode is connected to the source of the second MOSFET, and the negative terminal of the second diode is connected to the input terminal of the power converter.
[0009] The small battery boost control and isolation circuit further includes a third diode; The positive terminal of the third diode is connected to the power supply terminal of the battery, and the negative terminal of the third diode is connected to the input terminal of the power converter.
[0010] In the small battery boost control and isolation circuit, the connection point between the power supply terminal of the battery and the detection terminal of the microcontroller is connected to the positive terminal of the third diode.
[0011] The small battery boost control and isolation circuit wherein the power supply input terminal of the boost control chip is connected to the positive terminal of the small battery.
[0012] The small battery boost control and isolation circuit, wherein the boost control chip includes NAND gates and a drive controller; The two input terminals of the NAND gate serve as the two signal input terminals of the boost control chip; the signal output terminal of the NAND gate is connected to the signal input terminal of the drive controller. The first signal output terminal of the drive controller serves as the enable control terminal, and the second signal output terminal of the drive controller serves as the control output terminal.
[0013] In the small battery boost control and isolation circuit, the power supply terminal of the NAND gate is connected to the power supply terminal of the drive controller, and the connection point serves as the power supply input terminal of the boost control chip.
[0014] This application discloses a small battery boost control and isolation circuit. The circuit includes a boost circuit, a boost control chip, a second MOSFET, and a power converter. The positive terminal of the boost circuit is connected to the positive terminal of the small battery, and the negative terminal is connected to the negative terminal. The enable control terminal of the boost control chip is connected to the enable signal terminal of the boost circuit. The output terminal of the boost circuit is connected to the drain of the second MOSFET, and the control output terminal of the boost control chip is connected to the gate of the second MOSFET. The source of the second MOSFET and the power supply terminal of the battery are both connected to the input terminal of the power converter. The output terminal of the power converter is connected to the input terminal of a microcontroller. The power supply terminal of the battery is connected to the detection terminal of the microcontroller. The control terminal of the microcontroller and the power supply terminal of the battery are respectively connected to the two signal input terminals of the boost control chip. In this circuit, the boost control chip can directly detect low voltage in the battery and enable control the boost circuit. Even if the microcontroller cannot output a control signal, it can still ensure effective enable control of the boost circuit, significantly improving the reliability of the circuit control. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 The circuit structure diagram of the small battery boost control and isolation circuit provided in the embodiment of this utility model.
[0017] Reference numerals: U1, boost circuit; Q2, second MOSFET; S1, power converter; B1, storage battery; B2, small battery; L1, first inductor; Q1, first MOSFET; D1, first diode; C1, first capacitor; R1, first resistor; D2, second diode; D3, third diode; U4, NOT gate; U5, drive controller; U2, microcontroller. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0019] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0020] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0021] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0022] This utility model discloses a small battery boost control and isolation circuit, wherein the small battery B2 boost control and isolation circuit includes a boost circuit U1, a boost control chip, a second MOSFET Q2, and a power converter S1; the positive terminal of the boost circuit U1 is connected to the positive terminal of the small battery B2, and the negative terminal of the boost circuit U1 is connected to the negative terminal of the small battery B2; the enable control terminal of the boost control chip is connected to the enable signal terminal of the boost circuit U1; the output terminal of the boost circuit U1 is connected to the drain of the second MOSFET Q2, the control output terminal of the boost control chip is connected to the gate of the second MOSFET Q2, and the source of the second MOSFET Q2 and the power supply terminal of the battery B1 are both connected to the input terminal of the power converter S1; the output terminal of the power converter S1 is connected to the input terminal of the microcontroller U2; the power supply terminal of the battery B1 is connected to the detection terminal of the microcontroller U2; the control terminal of the microcontroller U2 and the power supply terminal of the battery B1 are respectively connected to the two signal input terminals of the boost control chip. Among them, the second MOS transistor Q2 is a P-MOS transistor.
[0023] The boost control chip outputs an enable control signal through the enable control terminal to enable the boost circuit U1. When the boost circuit U1 is enabled, the voltage of the small battery B2 can be boosted to obtain a higher voltage output to the power converter S1. When the battery B1 is not working properly, the boost control chip sends an enable control signal. When the battery B1 is working properly, the boost control chip stops sending the enable control signal.
[0024] The boost circuit U1's output is controlled by a second MOSFET Q2. When battery B1 fails and cannot supply power, the boost control chip sends a turn-on control signal to the second MOSFET Q2 to turn it on. When battery B1 is working normally, the microprocessor does not need power from the small battery B2, and the boost control chip sends a turn-off control signal to the second MOSFET Q2 to turn it off. The microcontroller U2 can be an MCU chip. The boost circuit U1 is isolated from the power converter S1, thus improving the reliability of power supply to the microcontroller U2.
[0025] One signal input terminal of the boost control chip is used to input the low-voltage detection signal of battery B1, and the other signal input terminal is used to input the control signal from microcontroller U2. When battery B1 suddenly loses power, if microcontroller U2 detects the power failure of battery B1 through its detection terminal and promptly outputs a control signal to the boost control chip through its control terminal, the boost control chip can enable the boost circuit U1 and control the second MOSFET Q2 to conduct based on the control signal. If battery B1 suddenly loses power, and microcontroller U2 fails to detect the power failure of battery B1 through its detection terminal or fails to promptly output a control signal to the boost control chip through its control terminal, the boost control chip can obtain the low-voltage detection signal of battery B1 and autonomously determine whether to start the small battery B2 to supply power based on the low-voltage detection signal. If the boost control chip determines that the small battery B2 needs to be started to supply power, it controls the boost circuit U1 to enable and controls the second MOSFET Q2 to conduct. Similarly, when the battery B1 resumes normal power supply, the boost control chip can control the boost circuit U1 to terminate the enable and control the second MOSFET Q2 to turn off based on the input signal.
[0026] In a more specific embodiment, the boost circuit U1 includes a first inductor L1, a first MOSFET Q1, a first diode D1, a first capacitor C1, and a first resistor R1. One end of the first inductor L1 serves as the positive terminal of the boost circuit U1, and the other end of the first inductor L1 is connected to the drain of the first MOSFET Q1 and the anode of the first diode D1. The cathode of the first diode D1 is connected to one end of the first capacitor C1 and one end of the first resistor R1, and the connection point serves as the output terminal of the boost circuit U1. The source of the first MOSFET Q1 is connected to the other end of the first resistor R1 and the other end of the first capacitor C1, and the connection point serves as the negative terminal of the boost circuit U1 and is grounded. The gate of the first MOSFET Q1 serves as the enable signal terminal of the boost circuit U1. Specifically, the first MOSFET Q1 is a P-MOSFET.
[0027] The boost circuit U1 consists of a first inductor L1, a first MOSFET Q1, a first diode D1, a first capacitor C1, and a first resistor R1. The boost circuit U1 boosts the low voltage of the small battery B2 and outputs a high voltage through its output terminal. The gate of the first MOSFET Q1 serves as the enable signal terminal, receiving an enable control signal, which is a PWM control signal. The PWM control signal regulates the on / off state of the first MOSFET Q1, ensuring the timing of energy storage and release in the first inductor L1, thereby stabilizing the output voltage.
[0028] In a more specific embodiment, a second diode D2 is also included; the anode of the second diode D2 is connected to the source of the second MOSFET Q2, and the cathode of the second diode D2 is connected to the input terminal of the power converter S1. A third diode D3 is also included; the anode of the third diode D3 is connected to the power supply terminal of the battery B1, and the cathode of the third diode D3 is connected to the input terminal of the power converter S1. Furthermore, the connection point between the power supply terminal of the battery B1 and the detection terminal of the microcontroller U2 is connected to the anode of the third diode D3.
[0029] To improve the stability of power supply to the boost circuit U1, a second diode D2 can be provided, which unidirectionally conducts the current output from the boost circuit U1. Similarly, to improve the stability of power supply to the battery B1, a third diode D3 can be provided, which unidirectionally conducts the current output from the power supply terminal of the battery B1.
[0030] In a more specific embodiment, the power supply input terminal of the boost control chip is connected to the positive terminal of the small battery B2. Specifically, the boost control chip includes a NAND gate U4 and a drive controller U5; the two input terminals of the NAND gate U4 serve as the two signal input terminals of the boost control chip; the signal output terminal of the NAND gate U4 is connected to the signal input terminal of the drive controller U5; the first signal output terminal of the drive controller U5 serves as the enable control terminal, and the second signal output terminal of the drive controller U5 serves as the control output terminal. The power supply terminal of the NAND gate U4 is connected to the power supply terminal of the drive controller U5, and the connection point serves as the power supply input terminal of the boost control chip.
[0031] To improve the reliability of the boost control chip, its power supply input can be connected to the positive terminal of a small battery B2. This allows the small battery B2 to reliably power the boost control chip, ensuring its continuous operation. Furthermore, the boost control chip can be configured to consist of a NAND gate U4 and a drive controller U5. The two inputs of the NAND gate U4 are used to input a low-voltage detection signal and a control signal from the microprocessor, respectively. The NAND gate U4 compares the two input signals and outputs a comparison signal. If the low-voltage detection signal is "low" or the control signal from the microprocessor is "low," the NAND gate U4 outputs a "high" level; if both the low-voltage detection signal and the control signal from the microprocessor are "high," the NAND gate U4 outputs a "low" level. When drive controller U5 receives a "high-level" signal from NAND gate U4, it enables boost circuit U1 and turns on the second MOSFET Q2. When drive controller U5 receives a "low-level" signal from NAND gate U4, it de-enables boost circuit U1 and turns off the second MOSFET Q2. To ensure a stable power supply for NAND gate U4 and drive controller U5, the power supply terminal of NAND gate U4 can be connected to the power supply terminal of drive controller U5, and further connected to the positive terminal of small battery B2.
[0032] This utility model discloses a boost control and isolation circuit for a small battery. The circuit includes a boost circuit, a boost control chip, a second MOSFET, and a power converter. The positive terminal of the boost circuit is connected to the positive terminal of the small battery, and the negative terminal is connected to the negative terminal. The enable control terminal of the boost control chip is connected to the enable signal terminal of the boost circuit. The output terminal of the boost circuit is connected to the drain of the second MOSFET, and the control output terminal of the boost control chip is connected to the gate of the second MOSFET. The source of the second MOSFET and the power supply terminal of the battery are both connected to the input terminal of the power converter. The output terminal of the power converter is connected to the input terminal of a microcontroller. The power supply terminal of the battery is connected to the detection terminal of the microcontroller. The control terminal of the microcontroller and the power supply terminal of the battery are respectively connected to the two signal input terminals of the boost control chip. In this circuit, the boost control chip can directly detect low voltage in the battery and enable control the boost circuit. Even if the microcontroller cannot output a control signal, it can still ensure effective enable control of the boost circuit, significantly improving the reliability of the circuit control.
[0033] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A small battery boost control and isolation circuit, characterized in that, The small battery boost control and isolation circuit includes a boost circuit, a boost control chip, a second MOSFET, and a power converter; The positive terminal of the boost circuit is connected to the positive terminal of the small battery, and the negative terminal of the boost circuit is connected to the negative terminal of the small battery. The enable control terminal of the boost control chip is connected to the enable signal terminal of the boost circuit. The output terminal of the boost circuit is connected to the drain of the second MOSFET. The control output terminal of the boost control chip is connected to the gate of the second MOSFET. The source of the second MOSFET and the power supply terminal of the battery are both connected to the input terminal of the power converter. The output terminal of the power converter is connected to the input terminal of the microcontroller. The power supply terminal of the battery is connected to the detection terminal of the microcontroller. The control terminal of the microcontroller and the power supply terminal of the battery are respectively connected to the two signal input terminals of the boost control chip.
2. The small battery boost control and isolation circuit according to claim 1, characterized in that, The second MOS transistor is a P-MOS transistor.
3. The small battery boost control and isolation circuit according to claim 2, characterized in that, The boost circuit includes a first inductor, a first MOSFET, a first diode, a first capacitor, and a first resistor; One end of the first inductor serves as the positive terminal of the boost circuit, and the other end of the first inductor is connected to the drain of the first MOSFET and the positive terminal of the first diode; the negative terminal of the first diode is connected to one end of the first capacitor and one end of the first resistor, and the connection point serves as the output terminal of the boost circuit. The source of the first MOS transistor is connected to the other end of the first resistor and the other end of the first capacitor, and the connection point serves as the negative terminal of the boost circuit and is grounded; the gate of the first MOS transistor serves as the enable signal terminal of the boost circuit.
4. The small battery boost control and isolation circuit according to claim 3, characterized in that, The first MOS transistor is a P-MOS transistor.
5. The small battery boost control and isolation circuit according to claim 4, characterized in that, It also includes a second diode; The positive terminal of the second diode is connected to the source of the second MOSFET, and the negative terminal of the second diode is connected to the input terminal of the power converter.
6. The small battery boost control and isolation circuit according to any one of claims 1-5, characterized in that, It also includes a third diode; The positive terminal of the third diode is connected to the power supply terminal of the battery, and the negative terminal of the third diode is connected to the input terminal of the power converter.
7. The small battery boost control and isolation circuit according to claim 6, characterized in that, The connection point between the power supply terminal of the battery and the detection terminal of the microcontroller is connected to the positive terminal of the third diode.
8. The small battery boost control and isolation circuit according to claim 6, characterized in that, The power input terminal of the boost control chip is connected to the positive terminal of the small battery.
9. The small battery boost control and isolation circuit according to claim 8, characterized in that, The boost control chip includes NAND gates and a drive controller; The two input terminals of the NAND gate serve as the two signal input terminals of the boost control chip; the signal output terminal of the NAND gate is connected to the signal input terminal of the drive controller. The first signal output terminal of the drive controller serves as the enable control terminal, and the second signal output terminal of the drive controller serves as the control output terminal.
10. The small battery boost control and isolation circuit according to claim 9, characterized in that, The power supply terminal of the NAND gate is connected to the power supply terminal of the drive controller, and the connection point serves as the power supply input terminal of the boost control chip.