Single-cell battery powered auxiliary circuit and battery management system

Abstract

This disclosure provides a single-cell battery power supply auxiliary circuit, which includes a voltage control chip, a power supply input module, a voltage regulation module, an enable control module, and an output control module. The power supply input module is connected to the single-cell battery power supply terminal. The two ends of the boost inductor in the voltage regulation module are respectively connected to the output terminal of the power supply input module and the input terminal of the output control module. The control terminals of both the enable control module and the output control module are connected to the enable output terminal of a microcontroller. The first terminal of the enable control module is connected to the inverting enable terminal of the voltage control chip. The boost and buck signal output terminals of the voltage control chip are respectively connected to the boost and buck enable terminals of the voltage regulation module. This circuit uses a voltage control chip to regulate the voltage regulation module, in conjunction with the boost inductor, to achieve a stable increase in the single-cell battery power supply voltage, ensuring that the output voltage meets design requirements. This solves the problem of high input voltage requirements in traditional solutions and expands the circuit's application scenarios.

Description

Technical Field

[0001] This disclosure relates to the technical field of battery power supply, and in particular to an auxiliary circuit for single-cell battery power supply and a battery management system. Background Technology

[0002] In battery system applications powered by a single 3.2V cell, a stable 12V auxiliary voltage regulator is a key element in ensuring the normal operation of the system. It is widely used in powering modules such as 3.3V auxiliary voltage regulators, 12V fan circuits, driver chips, and MOS driver circuits, providing stable and sufficient power support to these modules and playing a crucial role in maintaining the efficient operation and stable performance of the battery system.

[0003] However, current traditional chip solutions for providing 12V voltage regulation have significant drawbacks. On the one hand, these chip solutions typically require an input voltage higher than the maximum voltage of a single-cell battery power supply system, making them difficult to directly adapt to a single-cell 3.2V battery power supply system. On the other hand, even if some solutions can achieve the input, the power supply capacity they provide is insufficient to support larger power demands and cannot meet the 12V power drive and load-carrying requirements of numerous modules in the battery system. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a single-cell battery power supply auxiliary circuit that increases the battery output voltage through a boost chip to meet power drive requirements.

[0005] The purpose of this disclosure is achieved through the following technical solution:

[0006] A single-cell battery-powered auxiliary circuit includes a voltage control chip, a power supply input module, a voltage regulation module, an enable control module, and an output control module. The input terminal of the power supply input module is used to connect to the power supply terminal of the single-cell battery. The voltage regulation module includes a boost inductor and a transformer circuit. The first terminal of the boost inductor is connected to the output terminal of the power supply input module, and the second terminal of the boost inductor is connected to the input terminal of the transformer circuit.

[0007] The output terminal of the transformer circuit is connected to the input terminal of the output control module. The control terminals of the enable control module and the output control module are both connected to the enable output terminal of the microcontroller. The first terminal of the enable control module is connected to the inverting enable terminal of the voltage control chip, and the second terminal of the enable control module is grounded.

[0008] The voltage control chip's boost signal output terminal is connected to the transformer circuit's boost enable terminal, and the voltage control chip's buck signal output terminal is connected to the transformer circuit's buck enable terminal.

[0009] In one embodiment, the enable control module includes a first electronic switch and a first voltage divider resistor. The control terminal of the first electronic switch is connected to the enable output terminal of the microcontroller through the first voltage divider resistor. The first terminal of the first electronic switch is connected to the inverting enable terminal of the voltage control chip, and the second terminal of the first electronic switch is grounded.

[0010] In one embodiment, the enable control module further includes a second voltage divider resistor, the first end of which is connected to the control terminal of the first electronic switch, and the second end of which is grounded.

[0011] In one embodiment, the output control module includes a second electronic switch, a third electronic switch, a third voltage divider resistor, and a fourth voltage divider resistor. The enable output terminal of the microcontroller is connected to the control terminal of the second electronic switch through the third voltage divider resistor. The first terminal of the second electronic switch is connected to the first terminal of the fourth voltage divider resistor. The second terminal of the second electronic switch is grounded. The second terminal of the fourth voltage divider resistor is connected to the control terminal of the third electronic switch. The first terminal of the third electronic switch is connected to the output terminal of the voltage regulation module. The second terminal of the third electronic switch is used to output a boost voltage.

[0012] In one embodiment, the second electronic switch is an N-channel MOS transistor, and the third electronic switch is a P-channel MOS transistor.

[0013] In one embodiment, the output control module further includes a fifth voltage divider resistor, the first end of which is connected to the control terminal of the second electronic switch, and the second end of which is grounded.

[0014] In one embodiment, the voltage regulation module includes a fourth electronic switch, a fifth electronic switch, a sixth voltage divider resistor, and a seventh voltage divider resistor. The boost signal output terminal of the voltage control chip is connected to the control terminal of the fourth electronic switch through the sixth voltage divider resistor. The first terminal of the fourth electronic switch is connected to the input terminal of the output control module. The second terminal of the fourth electronic switch, the first terminal of the fifth electronic switch, and the second terminal of the boost inductor are all connected to the switching terminal of the voltage control chip. The buck signal output terminal of the voltage control chip is connected to the control terminal of the fifth electronic switch through the seventh voltage divider resistor. The second terminal of the fifth electronic switch is grounded.

[0015] In one embodiment, the battery-powered auxiliary circuit further includes a voltage feedback module, which includes a first feedback resistor and a second feedback resistor. A first end of the first feedback resistor is connected to the input end of the output control module, a second end of the first feedback resistor is connected to the feedback detection end of the voltage control chip, a first end of the second feedback resistor is connected to the second end of the first feedback resistor, and a second end of the second feedback resistor is grounded.

[0016] In one embodiment, the voltage control chip is model SC8201.

[0017] This application also provides a battery management system, including the single-cell battery power supply auxiliary circuit described in any embodiment.

[0018] Compared with the prior art, this disclosure has at least the following advantages:

[0019] The aforementioned single-cell battery power supply auxiliary circuit regulates and controls the voltage adjustment module through the boost signal output terminal and buck signal output terminal of the voltage control chip. In conjunction with the boost inductor, energy is stored during the energy storage stage and the stored magnetic energy is released during the energy release stage, converting it into electrical energy. This electrical energy is then superimposed on the input voltage to increase the output voltage. This allows the power supply from a single cell (e.g., 3.2V) to achieve a stable output voltage of 12V, ensuring that the output voltage meets the 12V output requirement. This solves the problem that the input voltage requirement of traditional solutions is higher than the maximum voltage of a single-cell battery power supply system, thus expanding the application scenarios of the circuit. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A circuit diagram of a single-cell battery-powered auxiliary circuit according to one embodiment;

[0022] Figure 2 for Figure 1 The diagram shows a partial circuit of a single-cell battery-powered auxiliary circuit.

[0023] Figure 3 for Figure 1 The circuit diagram of the power input module shown is shown.

[0024] Figure 4 for Figure 1 The circuit diagram of the voltage regulation module shown is shown.

[0025] Figure 5 for Figure 1 The circuit diagram of the enable control module is shown below;

[0026] Figure 6 for Figure 1 The circuit diagram of the output control module is shown below;

[0027] Figure 7 for Figure 1 The circuit diagram of the voltage feedback module is shown. Detailed Implementation

[0028] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0032] like Figures 1 to 7 As shown, a single-cell battery power supply auxiliary circuit 10 according to an embodiment of this disclosure includes a voltage control chip U1, a power supply input module 100, a voltage regulation module 200, an enable control module 300, and an output control module 400. The input terminal of the power supply input module 100 is used to connect to the single-cell battery power supply terminal BAT+. The voltage regulation module 200 includes a boost inductor LD2 and a transformer circuit. The first terminal of the boost inductor LD2 is connected to the output terminal of the power supply input module 100, and the second terminal of the boost inductor LD2 is connected to the input terminal of the transformer circuit.

[0033] The output terminal of the transformer circuit is connected to the input terminal of the output control module 400. The control terminals of the enable control module 300 and the output control module 400 are both connected to the enable output terminal EN of the microcontroller. The first terminal of the enable control module 300 is connected to the inverted enable terminal / CE of the voltage control chip U1, and the second terminal of the enable control module 300 is grounded.

[0034] Among them, the boost signal output terminal HD of the voltage control chip U1 is connected to the boost enable terminal of the transformer circuit, and the buck signal output terminal LD ​​of the voltage control chip U1 is connected to the buck enable terminal of the transformer circuit.

[0035] In this embodiment, when the microcontroller sends an enable signal through the enable output terminal EN, the enable control module 300 is turned on, pulling the inverted enable terminal / CE of the voltage control chip U1 low, thereby activating the voltage control chip U1 and putting it into working state. As the voltage control chip U1 starts working and during the boost process, its boost signal output terminal HD outputs a boost control signal to the boost enable terminal of the voltage regulation module 200, while its buck signal output terminal LD ​​outputs a corresponding control signal to the buck enable terminal of the voltage regulation module 200, thereby driving the transformer circuit to begin energy storage. Since the first terminal of the boost inductor LD2 is connected to the output terminal of the power supply input module 100, it receives power from a single battery. At this time, the boost inductor LD2 begins to store energy, the current in the boost inductor LD2 gradually increases, and the electrical energy is converted into magnetic energy and stored. Subsequently, under the control of the voltage control chip U1, its buck signal output terminal LD ​​outputs a buck control signal to the buck enable terminal of the voltage regulation module 200, while the boost signal output terminal HD outputs a corresponding control signal to the boost enable terminal of the voltage regulation module 200. This drives the transformer circuit to begin energy release, and the boost inductor LD2 releases its stored magnetic energy, converting it into electrical energy, which is then superimposed on the input voltage, thereby increasing the output voltage. Finally, after the boost effect of the boost inductor LD2, the output voltage is boosted to 12V to meet the requirements of the auxiliary power supply circuit.

[0036] The aforementioned single-cell battery power supply auxiliary circuit 10 regulates and controls the voltage regulation module 200 through the boost signal output terminal HD and the buck signal output terminal LD ​​of the voltage control chip U1. In conjunction with the boost inductor LD2, it stores energy during the energy storage stage and releases the stored magnetic energy during the energy release stage, converting it into electrical energy. This energy is then superimposed on the input voltage to increase the output voltage, enabling the power supply of a single cell battery (e.g., 3.2V) to achieve a stable output voltage of 12V. This ensures that the output voltage meets the 12V output requirement, thereby solving the problem that the input voltage requirement of traditional solutions is higher than the maximum voltage of a single-cell battery power supply system, and expanding the application scenarios of the circuit.

[0037] like Figure 2 and Figure 5 As shown, in one embodiment, the enable control module 300 includes a first electronic switch MD12 and a first voltage divider resistor RD47. The control terminal of the first electronic switch MD12 is connected to the enable output terminal EN of the microcontroller through the first voltage divider resistor RD47. The first terminal of the first electronic switch MD12 is connected to the inverting enable terminal / CE of the voltage control chip U1, and the second terminal of the first electronic switch MD12 is grounded. In this embodiment, when the microcontroller sends an enable signal through the enable output terminal EN, the signal is transmitted to the control terminal of the first electronic switch MD12 through the first voltage divider resistor RD47. This causes the voltage at the control terminal of the first electronic switch MD12 to meet its conduction threshold voltage, turning on the first electronic switch MD12. This causes the inverting enable terminal / CE of the voltage control chip U1 to form a loop with the ground terminal through the first electronic switch, thereby pulling the inverting enable terminal / CE of the voltage control chip U1 low and activating the voltage control chip U1, so that the voltage control chip U1 enters the working state. Since the enable signal voltage output by the microcontroller may not match the trigger voltage required by the control terminal of the first electronic switch MD12, the voltage of the enable signal can be adjusted to a suitable range through the voltage division effect of the first voltage divider resistor RD47, so as to ensure that the first electronic switch MD12 can accurately perform the conduction or cutoff operation according to the signal state.

[0038] like Figure 2 and Figure 5 As shown, in one embodiment, the enable control module 300 further includes a second voltage divider resistor RD46. The first end of the second voltage divider resistor RD46 is connected to the control terminal of the first electronic switch MD12, and the second end of the second voltage divider resistor RD46 is grounded. In this embodiment, when the microcontroller sends an enable signal through the enable output terminal EN, and the signal is transmitted to the control terminal of the first electronic switch MD12 via the first voltage divider resistor RD47, the second voltage divider resistor RD46 functions as a voltage divider and anti-interference device. Specifically, when the signal output by the microcontroller fluctuates or is subject to external interference, the second voltage divider resistor RD46 can stabilize the potential of the control terminal of the first electronic switch MD12 within a relatively reasonable range. This allows the second voltage divider resistor RD46 and the first voltage divider resistor RD47 to form a voltage divider network, precisely dividing the enable signal output by the microcontroller, thereby ensuring that the voltage input to the control terminal of the first electronic switch MD12 is within its optimal operating range.

[0039] In another embodiment, the first electronic switch MD12 is an N-channel MOSFET. In this embodiment, the first terminal of the first electronic switch MD12 is the drain of the N-channel MOSFET, the second terminal of the first electronic switch MD12 is the source of the N-channel MOSFET, and the control terminal of the first electronic switch MD12 is the gate of the N-channel MOSFET. When the microcontroller sends an enable signal through the enable output terminal EN, the signal is transmitted to the gate of the N-channel MOSFET through the first voltage divider resistor RD47. As the gate voltage gradually increases, when it reaches or exceeds the conduction threshold voltage of the N-channel MOSFET, the N-channel MOSFET begins to conduct. At this time, a low-impedance path is formed between the drain and the source. The inverting enable terminal / CE of the voltage control chip U1 forms a loop with the ground terminal through the N-channel MOSFET, and the inverting enable terminal / CE is pulled low, thereby activating the voltage control chip U1 and putting it into operation. Furthermore, the on-resistance of the N-channel MOSFET is extremely low when it is in the conducting state. This results in a very small voltage drop when current flows through the first electronic switch MD12, thereby reducing the energy loss of a single battery cell and improving the overall circuit efficiency.

[0040] like Figure 1 and Figure 6 As shown, in one embodiment, the output control module 400 includes a second electronic switch MD11, a third electronic switch MD8, a third voltage divider resistor RD26, and a fourth voltage divider resistor RD25. The enable output terminal EN of the microcontroller is connected to the control terminal of the second electronic switch MD11 through the third voltage divider resistor RD26. The first terminal of the second electronic switch MD11 is connected to the first terminal of the fourth voltage divider resistor RD25, and the second terminal of the second electronic switch MD11 is grounded. The second terminal of the fourth voltage divider resistor RD25 is connected to the control terminal of the third electronic switch MD8, and the first terminal of the third electronic switch MD8 is connected to the output terminal of the voltage regulation module 200. The second terminal of the third electronic switch MD8 is used to output a boost voltage. In this embodiment, when the microcontroller sends an enable signal through the enable output terminal EN, the signal is transmitted to the control terminal of the second electronic switch MD11 through the third voltage divider resistor RD26. As the voltage at the control terminal gradually increases, when it reaches or exceeds the conduction threshold voltage of the second electronic switch MD11, the second electronic switch MD11 begins to conduct. At this time, a low-impedance path is formed between the first and second terminals of the second electronic switch MD11. The control terminal voltage of the third electronic switch is pulled to a low level through the path formed by the fourth voltage divider resistor RD25 and the second electronic switch MD11, so that the third electronic switch meets its conduction threshold voltage, thereby turning on the third electronic switch. Then, the boost voltage output by the voltage regulation module 200 is transmitted to the voltage output terminal through the first and second terminals of the third electronic switch MD8 to realize the output of the boost voltage.

[0041] like Figure 1 and Figure 6 As shown, in one embodiment, the second electronic switch MD11 is an N-channel MOSFET, and the third electronic switch MD8 is a P-channel MOSFET. In this embodiment, the first terminal of the second electronic switch MD11 is the drain of the N-channel MOSFET, the second terminal of the second electronic switch MD11 is the source of the N-channel MOSFET, and the control terminal of the second electronic switch MD11 is the gate of the N-channel MOSFET; the first terminal of the third electronic switch MD8 is the source of the P-channel MOSFET, the second terminal of the third electronic switch MD8 is the drain of the P-channel MOSFET, and the control terminal of the third electronic switch MD8 is the gate of the P-channel MOSFET. When the microcontroller sends an enable signal through the enable output terminal EN, the signal is transmitted to the gate of the second electronic switch MD11 through the third voltage divider resistor RD26. As the gate voltage gradually increases, when it reaches or exceeds the turn-on threshold voltage of the N-channel MOSFET, the second electronic switch MD11 begins to conduct. At this point, a low-impedance path is formed between the drain and source of the second electronic switch MD11, and current flows through the fourth voltage divider resistor RD25, generating a voltage drop across RD25, which lowers the gate voltage of the third electronic switch MD8. When the gate voltage of the third electronic switch MD8 drops below its turn-on threshold voltage, the third electronic switch MD8 turns on. At this time, the boosted voltage output by the voltage regulation module 200 is transmitted to the output terminal through the source and drain of the third electronic switch MD8, realizing the output of the boosted voltage. Furthermore, by using a combination of N-channel and P-channel MOSFETs, along with the third and fourth voltage divider resistors RD26 and RD25, simple and effective control of the output voltage is achieved, while reducing the number of components, thereby reducing circuit complexity and cost.

[0042] like Figure 1 and Figure 6 As shown, in one embodiment, the output control module 400 further includes a fifth voltage divider resistor RD44. The first terminal of the fifth voltage divider resistor RD44 is connected to the control terminal of the second electronic switch MD11, and the second terminal of the fifth voltage divider resistor RD44 is grounded. In this embodiment, when the microcontroller sends an enable signal through the enable output terminal EN, the signal is first initially divided by the third voltage divider resistor RD26, and then transmitted to the control terminal of the second electronic switch MD11. The fifth voltage divider resistor RD44 and the third voltage divider resistor RD26 together form a voltage divider network, further precisely regulating the voltage input to the control terminal of the second electronic switch MD11. This voltage division ensures that the second electronic switch MD11 can operate within a suitable voltage range, avoiding malfunctions or damage caused by excessively high or low voltage.

[0043] like Figure 1 and Figure 4 As shown, in one embodiment, the voltage regulation module 200 includes a fourth electronic switch MD6, a fifth electronic switch MD10, a sixth voltage divider resistor RD17, and a seventh voltage divider resistor RD43. The boost signal output terminal HD of the voltage control chip U1 is connected to the control terminal of the fourth electronic switch MD6 through the sixth voltage divider resistor RD17. The first terminal of the fourth electronic switch MD6 is connected to the input terminal of the output control module 400. The second terminal of the fourth electronic switch MD6, the first terminal of the fifth electronic switch MD10, and the second terminal of the boost inductor LD2 are all connected to the switching terminal SW of the voltage control chip U1. The buck signal output terminal LD ​​of the voltage control chip U1 is connected to the control terminal of the fifth electronic switch MD10 through the seventh voltage divider resistor RD43. The second terminal of the fifth electronic switch MD10 is grounded. In this embodiment, the first terminal of the fourth electronic switch MD6 is the drain of the N-channel MOSFET, the second terminal of the fourth electronic switch MD6 is the source of the N-channel MOSFET, and the control terminal of the fourth electronic switch MD6 is the gate of the N-channel MOSFET; the first terminal of the fifth electronic switch MD10 is the drain of the N-channel MOSFET, the second terminal of the fifth electronic switch MD10 is the source of the N-channel MOSFET, and the control terminal of the fifth electronic switch MD10 is the gate of the N-channel MOSFET. The boost signal output terminal HD of the voltage control chip U1 is connected to the gate of the fourth electronic switch MD6 through the sixth voltage divider resistor RD17. The source of the fourth electronic switch MD6 is connected to the second terminal of the boost inductor LD2 and the switching terminal SW, and the drain is connected to the input terminal of the output control module 400. The buck signal output terminal LD ​​of the voltage control chip U1 is connected to the gate of the fifth electronic switch MD10 through the seventh voltage divider resistor RD43. The drain of the fifth electronic switch MD10 is connected to the second terminal of the boost inductor LD2, and the source of the fifth electronic switch MD10 is grounded.

[0044] Furthermore, when the microcontroller sends an enable signal through the enable output terminal EN, enabling the control module 300 to conduct and activate the voltage control chip U1, the voltage control chip U1 begins to operate. At this time, the buck signal output terminal LD ​​of the voltage control chip U1 outputs a buck control signal, which is transmitted to the control terminal of the fifth electronic switch MD10 through the seventh voltage divider resistor RD43. As the voltage at the control terminal gradually increases and reaches the conduction threshold voltage of the fifth electronic switch MD10, the fifth electronic switch MD10 conducts. With the fifth electronic switch MD10 conducting, the input voltage of a single battery forms a loop through inductor LD2 and the fifth electronic switch MD10. Current flows through inductor LD2, and energy begins to be stored. As the current increases, the magnetic field in the inductor gradually strengthens. During this process, the fourth electronic switch MD6 is in the off state, and its drain and source are essentially open circuits, with no current flowing through it.

[0045] Subsequently, the boost signal output terminal HD of the voltage control chip U1 outputs a boost control signal, which is transmitted to the control terminal of the fourth electronic switch MD6 through the sixth voltage divider resistor RD17. As the voltage at the control terminal gradually increases and reaches the conduction threshold voltage of the fourth electronic switch MD6, the fourth electronic switch MD6 turns on. At the same time, the buck signal output terminal LD ​​stops outputting the buck control signal, and the fifth electronic switch MD10 turns off. When the fifth electronic switch MD10 is off and the fourth electronic switch MD6 is on, the current in the boost inductor LD2 cannot change abruptly. The boost inductor LD2 generates a reverse electromotive force, causing the current to form a loop through the fourth electronic switch MD6, capacitors CD23 and CD24. At this time, the boost inductor LD2 releases the previously stored energy, which is superimposed on the input voltage to jointly supply power to the output terminal, thereby achieving the purpose of boosting the voltage.

[0046] Furthermore, by repeatedly performing the above process of MD10 conducting and storing energy and MD10 turning off and releasing energy, the output voltage gradually increases. Components such as capacitors CD23 and CD24 play a role in filtering and stabilizing the output voltage, reducing voltage fluctuations, and finally stabilizing the output voltage at 12V to meet the requirements of the auxiliary power supply circuit.

[0047] like Figure 1 , Figure 6 and Figure 7As shown, in one embodiment, the battery-powered auxiliary circuit further includes a voltage feedback module 500. The voltage feedback module 500 includes a first feedback resistor RD51 and a second feedback resistor RD53. The first end of the first feedback resistor RD51 is connected to the input terminal of the output control module 400, and the second end of the first feedback resistor RD51 is connected to the feedback detection terminal of the voltage control chip U1. The first end of the second feedback resistor RD53 is connected to the second end of the first feedback resistor RD51, and the second end of the second feedback resistor RD53 is grounded. In this embodiment, the first end of the first feedback resistor RD51 is connected to the input terminal of the output control module 400 for real-time sampling of the output voltage. After the sampled voltage is divided by the first feedback resistor RD51 and the second feedback resistor RD53, a feedback voltage proportional to the output voltage is obtained. The feedback voltage is transmitted to the feedback detection terminal of the voltage control chip U1. The voltage control chip U1 compares the feedback voltage with an internally set reference voltage and calculates the deviation between the output voltage and the preset value. Then, the voltage control chip U1 dynamically adjusts the duty cycle of its boost signal output terminal HD and buck signal output terminal LD ​​based on the calculated deviation value. Specifically, if the output voltage is lower than the preset value, the voltage control chip U1 increases the output of the boost signal, causing the boost inductor LD2 to store more energy and release it, thereby increasing the output voltage; conversely, if the output voltage is higher than the preset value, the voltage control chip U1 increases the output of the buck signal, reducing the energy storage and release process of the boost inductor LD2 to lower the output voltage, thus achieving precise regulation of the output voltage to ensure that the circuit output voltage is stable at 12V.

[0048] like Figure 1 and Figure 2 As shown, in one embodiment, the voltage control chip is model SC8201. In this embodiment, the SC8201 chip has high-precision voltage regulation capability, enabling it to accurately control the output signals of the boost signal output terminal HD and the buck signal output terminal LD, ensuring that the boost inductor LD2 can operate accurately according to preset parameters during energy storage and release. During the boost phase, the SC8201 chip, through precise boost signal control, enables the boost inductor LD2 to store electrical energy from a single battery cell and convert it into magnetic energy. During the release phase, the chip precisely controls the buck signal, allowing the magnetic energy released by the boost inductor LD2 to be superimposed on the input voltage, thereby achieving a stable and accurate 12V output voltage. This improves the stability of the output voltage and avoids adverse effects on subsequent circuits caused by voltage fluctuations.

[0049] This application also provides a battery management system, including a single-cell battery power supply auxiliary circuit 10 according to any embodiment. In this embodiment, when the microcontroller sends an enable signal through the enable output terminal EN, the enable control module 300 is turned on, pulling the inverted enable terminal / CE of the voltage control chip U1 low, thereby activating the voltage control chip U1 and putting it into working state. The voltage control chip U1 starts working, and during the boost process, its boost signal output terminal HD outputs a boost control signal to the boost enable terminal of the voltage regulation module 200, while the buck signal output terminal LD ​​outputs a corresponding control signal to the buck enable terminal of the voltage regulation module 200, thereby driving the transformer circuit to start working. Furthermore, since the first terminal of the boost inductor LD2 is connected to the output terminal of the power supply input module 100, it receives power from the single-cell battery. At this time, the boost inductor LD2 begins to store energy, the current in the boost inductor LD2 gradually increases, and the electrical energy is converted into magnetic energy and stored. Subsequently, under the control of voltage control chip U1, boost inductor LD2 releases its stored magnetic energy, converting it into electrical energy, which is then superimposed on the input voltage to increase the output voltage. Finally, after the boost effect of boost inductor LD2, the output voltage is increased to 12V to meet the requirements of the auxiliary power supply circuit.

[0050] Compared with the prior art, this disclosure has at least the following advantages:

[0051] The aforementioned single-cell battery power supply auxiliary circuit 10 regulates and controls the voltage regulation module 200 through the boost signal output terminal HD and the buck signal output terminal LD ​​of the voltage control chip U1. In conjunction with the boost inductor LD2, it stores energy during the energy storage stage and releases the stored magnetic energy during the energy release stage, converting it into electrical energy. This energy is then superimposed on the input voltage to increase the output voltage, enabling the power supply of a single cell battery (e.g., 3.2V) to achieve a stable output voltage of 12V. This ensures that the output voltage meets the 12V output requirement, thereby solving the problem that the input voltage requirement of traditional solutions is higher than the maximum voltage of a single-cell battery power supply system, and expanding the application scenarios of the circuit.

[0052] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A single-cell battery powered auxiliary circuit, characterized by, The system includes a voltage control chip, a power supply input module, a voltage regulation module, an enable control module, and an output control module. The input terminal of the power supply input module is connected to the power supply terminal of a single battery. The voltage regulation module includes a boost inductor and a transformer circuit. The first terminal of the boost inductor is connected to the output terminal of the power supply input module, and the second terminal of the boost inductor is connected to the input terminal of the transformer circuit. The output terminal of the transformer circuit is connected to the input terminal of the output control module. Both the control terminals of the enable control module and the output control module are connected to the enable output terminal of the microcontroller. The first terminal of the enable control module is connected to the inverting enable terminal of the voltage control chip, and the second terminal of the enable control module is grounded. The voltage control chip's boost signal output terminal is connected to the transformer circuit's boost enable terminal, and the voltage control chip's buck signal output terminal is connected to the transformer circuit's buck enable terminal.

2. The single-cell battery-powered auxiliary circuit according to claim 1, characterized in that, The enable control module includes a first electronic switch and a first voltage divider resistor. The control terminal of the first electronic switch is connected to the enable output terminal of the microcontroller through the first voltage divider resistor. The first terminal of the first electronic switch is connected to the inverting enable terminal of the voltage control chip, and the second terminal of the first electronic switch is grounded.

3. The single-cell battery powered auxiliary circuit of claim 2, wherein, The enable control module further includes a second voltage divider resistor, the first end of which is connected to the control terminal of the first electronic switch, and the second end of which is grounded.

4. The single-cell battery powered auxiliary circuit of claim 1, wherein, The output control module includes a second electronic switch, a third electronic switch, a third voltage divider resistor, and a fourth voltage divider resistor. The enable output terminal of the microcontroller is connected to the control terminal of the second electronic switch through the third voltage divider resistor. The first terminal of the second electronic switch is connected to the first terminal of the fourth voltage divider resistor. The second terminal of the second electronic switch is grounded. The second terminal of the fourth voltage divider resistor is connected to the control terminal of the third electronic switch. The first terminal of the third electronic switch is connected to the output terminal of the voltage regulation module. The second terminal of the third electronic switch is used to output a boost voltage.

5. The single-cell battery powered auxiliary circuit of claim 4, wherein, The second electronic switch is an N-channel MOS transistor, and the third electronic switch is a P-channel MOS transistor.

6. The single-cell battery powered auxiliary circuit of claim 4, wherein, The output control module further includes a fifth voltage divider resistor, the first end of which is connected to the control terminal of the second electronic switch, and the second end of which is grounded.

7. The single-cell battery powered auxiliary circuit of claim 1, wherein, The voltage regulation module includes a fourth electronic switch, a fifth electronic switch, a sixth voltage divider resistor, and a seventh voltage divider resistor. The boost signal output terminal of the voltage control chip is connected to the control terminal of the fourth electronic switch through the sixth voltage divider resistor. The first terminal of the fourth electronic switch is connected to the input terminal of the output control module. The second terminal of the fourth electronic switch, the first terminal of the fifth electronic switch, and the second terminal of the boost inductor are all connected to the switching terminal of the voltage control chip. The buck signal output terminal of the voltage control chip is connected to the control terminal of the fifth electronic switch through the seventh voltage divider resistor. The second terminal of the fifth electronic switch is grounded.

8. The single-cell battery powered auxiliary circuit of claim 1, wherein, The battery-powered auxiliary circuit further includes a voltage feedback module, which includes a first feedback resistor and a second feedback resistor. The first end of the first feedback resistor is connected to the input end of the output control module, the second end of the first feedback resistor is connected to the feedback detection end of the voltage control chip, the first end of the second feedback resistor is connected to the second end of the first feedback resistor, and the second end of the second feedback resistor is grounded.

9. The single-cell battery-powered auxiliary circuit according to claim 1, characterized in that, The voltage control chip is model SC8201.

10. A battery management system, characterized by, Includes a single-cell battery-powered auxiliary circuit as described in any one of claims 1 to 9.

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