Multifunction power supply circuit and power supply device

Abstract

The utility model relates to electronic circuit technical field especially, and more particularly to a kind of multifunctional power supply circuit and power supply device, and the power supply circuit includes: power management chip, first voltage conversion circuit and second voltage conversion circuit, power management chip is core control chip, for controlling and managing to entire power supply circuit, first voltage conversion circuit and second voltage conversion circuit are used for voltage conversion, to realize multiway power supply output.The utility model's power management chip integrates peripheral interface input, lithium battery charge-discharge management, power path automatic switching, boost-buck conversion and multiway voltage-stabilized output in one, while supplemented with 3.3V buck output and multiway expansion interface.According to the power supply circuit provided by the utility model, battery can be charged and discharged, and stable power supply voltage can be output, and peripheral interface chip can be powered, to meet the power supply needs of various working scenarios.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a multifunctional power supply circuit and power supply device. Background Technology

[0002] In related technologies, to power some open-source multi-functional development board circuits and facilitate the connection of various modules in teaching, thereby training students' programming and hardware development abilities, a challenge has arisen: how to power these multi-functional development boards. Due to the complexity of these circuits, the power supply circuit used to power them must be adapted to meet the power requirements of the development board in various operating scenarios. However, the power supply circuits in related technologies typically only output a single stable supply voltage, which cannot meet the power supply needs of multi-functional development board circuits. Utility Model Content

[0003] This utility model provides a multifunctional power supply circuit and power supply device to solve the technical problem of the single power supply function of power supply circuits in related technologies.

[0004] In a first aspect, this utility model provides a multifunctional power supply circuit, the power supply circuit comprising: a power management chip, a first inductor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a fortieth resistor, a fiftieth resistor, and a fifty-second resistor. The first, second, and third switch node pins of the power management chip are all connected to the first end of the first inductor. The second end of the first inductor is used to receive the power supply voltage. The second end of the first inductor is connected to the first end of the fifty-second resistor, the first end of the twenty-first capacitor, and the first end of the twenty-tenth capacitor, respectively. The second end of the fifty-second resistor is connected to the first end of the twenty-second capacitor. The second ends of the twenty-second, twenty-first, and twenty-tenth capacitors are all grounded. The input pin of the power management chip is connected to the first end of the twenty-second capacitor. The bootstrap capacitor pin of the power management chip is connected to the first end of the seventeenth capacitor. The second end of the seventeenth capacitor is connected to the first end of the first inductor. The temperature detection pin of the power management chip is connected to the first end of the thirty-third resistor, and the second end of the thirty-third resistor is grounded; the positive and negative signal transmission pins of the power management chip are respectively used to connect to the peripheral interface chip. The charging selection pin of the power management chip is connected to the first end of the fortieth resistor, the second end of the fortieth resistor is grounded, the charging current setting pin ISET of the power management chip is connected to the first end of the fiftieth resistor, and the second end of the fiftieth resistor is grounded. The power ground pin and the power enable pin of the power management chip are connected, and both the power ground pin and the power enable pin are grounded; the enable output pin of the power management chip is connected to the first end of the forty-ninth resistor, and the second end of the forty-ninth resistor is grounded. The power management chip has its first output pin and second output pin connected together, and the first output pin is connected to the first terminal of the eighteenth capacitor, while the second terminal of the eighteenth capacitor is grounded; the second output pin is connected to the first terminal of the nineteenth capacitor, while the second terminal of the nineteenth capacitor is grounded. The first boost output intermediate node pin of the power management chip is connected to the first end of the fifteenth capacitor, and the second end of the fifteenth capacitor is grounded; the second boost output intermediate node pin of the power management chip is connected to the first end of the sixteenth capacitor, and the second end of the sixteenth capacitor is grounded.

[0005] In one possible design, the multi-functional power supply circuit further includes a fifty-first resistor and a first light-emitting diode; The LED display pin of the power management chip is connected to the first end of the fifty-first resistor, the second end of the fifty-first resistor is connected to the positive terminal of the first light-emitting diode, and the negative terminal of the first light-emitting diode is grounded.

[0006] In one possible design, the multifunctional power supply circuit further includes a first voltage conversion circuit, which includes a first voltage conversion chip, a thirty-second capacitor, a thirty-seventh capacitor, a forty-first capacitor, a forty-second capacitor, a forty-third capacitor, and a second inductor. The enable pin and input pin of the first voltage conversion chip are connected, and both the enable pin and the input pin are used to receive power supply voltage; the enable pin is connected to the first terminal of the forty-second capacitor, the second terminal of the forty-second capacitor is grounded, and the input pin is connected to the first terminal of the thirty-second capacitor, the second terminal of the thirty-second capacitor is grounded. The switching control pin of the first voltage conversion chip is connected to the first end of the second inductor, and the second end of the second inductor is connected to the first end of the forty-first capacitor and the first end of the forty-third capacitor, respectively. The second ends of the forty-first capacitor and the forty-third capacitor are both grounded. The bootstrap capacitor pin of the first voltage conversion chip is connected to the first end of the thirty-seventh capacitor, and the second end of the thirty-seventh capacitor is connected to the first end of the second inductor. The second end of the second inductor is used to output the second supply voltage. The first end of the second inductor is also connected to the feedback pin of the first voltage conversion chip, and the ground pin of the first voltage conversion chip is connected to the common ground.

[0007] In one possible design, the multi-functional power supply circuit further includes a second light-emitting diode, a third light-emitting diode, a forty-third resistor, and a second resistor; The first end of the forty-third resistor is used to receive the first power supply voltage, the second end of the forty-third resistor is connected to the positive terminal of the second light-emitting diode, and the negative terminal of the second light-emitting diode is grounded; The first end of the second resistor is connected to the second end of the second inductor, the second end of the second resistor is connected to the positive terminal of the third light-emitting diode, and the negative terminal of the third light-emitting diode is grounded.

[0008] In one possible design, the multi-functional power supply circuit also includes multiple expansion interfaces. The input of each expansion interface is connected to a first boost output intermediate node pin or a second boost output intermediate node pin of the power management chip. The expansion interface is used to power other functional modules.

[0009] In one possible design, the multifunctional power supply circuit further includes a second voltage conversion circuit, which includes a second voltage conversion chip, a first capacitor, a third capacitor, a seventh capacitor, a twenty-third capacitor, a second Zener diode, a third inductor, a twentieth resistor, and a fifty-second resistor. The input pin of the second voltage conversion chip is connected to the first end of the third capacitor. The first end of the third capacitor is used to receive the power supply voltage, and the second end of the third capacitor is grounded. The power enable pin and the ground pin of the second voltage conversion chip are both grounded. The phase compensation pin PH of the second voltage conversion chip is connected to the first terminal of the third inductor and the negative terminal of the second Zener diode, respectively. The positive terminal of the second Zener diode is grounded. The second terminal of the third inductor is connected to the first terminal of the twenty-third capacitor, the first terminal of the seventh capacitor, and the first terminal of the twenty-tenth resistor, respectively. The second terminals of the twenty-third capacitor and the seventh capacitor are both grounded. The second terminal of the twenty-tenth resistor is connected to the first terminal of the fifty-second resistor, and the second terminal of the fifty-second resistor is grounded. The second terminal of the third inductor is used to output the first supply voltage.

[0010] In one possible design, the second voltage conversion circuit also includes a fourth capacitor and a fifth capacitor; The first terminal of the fourth capacitor and the first terminal of the fifth capacitor are both connected to the input pin of the second voltage conversion chip, and the second terminals of the fourth capacitor and the fifth capacitor are both grounded.

[0011] Secondly, this utility model also provides a power supply device, which includes a multifunctional power supply circuit as described in any of the above claims.

[0012] The multifunctional power supply circuit provided in the first aspect above includes: a power management chip, a first inductor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a fortieth resistor, a fiftieth resistor, and a fifty-second resistor; wherein, the first switch node pin, the second switch node pin, and the third switch node pin of the power management chip are all connected to the first end of the first inductor, and the second end of the first inductor is used to receive the power supply voltage; the second end of the first inductor is connected to the first end of the fifty-second resistor, the first end of the twenty-first capacitor, and the first end of the twenty-second capacitor, respectively, and the second ends of the fifty-second resistor, the twenty-first capacitor, and the twenty-second capacitor are all grounded; the temperature detection pin of the power management chip is connected to the first end of the thirty-third resistor, and the second end of the thirty-third resistor is grounded; the positive signal transmission pin and the negative signal transmission pin of the power management chip are respectively used to connect to peripheral interfaces. The power management chip has the following components: a charging selection pin connected to the first end of a 40th resistor, the second end of which is grounded; a charging current setting pin (ISET) connected to the first end of a 50th resistor, the second end of which is grounded; a power ground pin and a power enable pin connected to the power management chip, both grounded; an enable output pin connected to the first end of a 49th resistor, the second end of which is grounded; a first output pin and a second output pin connected, the first output pin connected to the first end of an 18th capacitor, the second end of which is grounded; a second output pin connected to the first end of a 19th capacitor, the second end of which is grounded; a first boost output intermediate node pin connected to the first end of a 15th capacitor, the second end of which is grounded; and a second boost output intermediate node pin connected to the first end of a 16th capacitor, the second end of which is grounded. The power circuit provided by this invention can manage battery charging and discharging, output a stable supply voltage, and supply power to peripheral interface chips to meet the power supply needs of various working scenarios.

[0013] The beneficial effects provided by the other aspects and the various possible designs of the other aspects can be found in the beneficial effects of the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0014] Figure 1 One of the schematic diagrams of the multifunctional power supply circuit structure provided in the embodiments of this utility model; Figure 2 This is a schematic diagram of the first voltage conversion circuit structure provided in an embodiment of the present invention; Figure 3A schematic diagram of the structure of the multifunctional power supply circuit provided in the embodiment of this utility model; Figure 4 A schematic diagram of the peripheral interface circuit structure provided for an embodiment of this utility model. Detailed Implementation

[0015] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can represent: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “back,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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. Therefore, they should not be construed as limitations on this utility model.

[0017] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a media, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0018] To meet the power supply requirements of development board circuits in various working scenarios, this utility model provides a multifunctional power supply circuit. The power supply circuit includes: a power management chip, a first inductor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a fortieth resistor, a fiftieth resistor, and a fifty-second resistor. The first, second, and third switch node pins of the power management chip are all connected to the first terminal of the first inductor, and the second terminal of the first inductor is used to receive the power supply voltage. The second terminal of the first inductor is connected to the first terminal of the fifty-second resistor, the first terminal of the twenty-first capacitor, and the first terminal of the twenty-second capacitor, respectively. The second terminals of the fifty-second resistor, the twenty-first capacitor, and the twenty-second capacitor are all grounded. The temperature detection pin of the power management chip is connected to the first terminal of the thirty-third resistor, and the second terminal of the thirty-third resistor is grounded. The power management chip also includes a positive signal transmission pin and a negative signal transmission pin. These pins are used to connect to peripheral interface chips. The charging selection pin of the power management chip is connected to the first end of the 40th resistor, and the second end of the 40th resistor is grounded. The charging current setting pin (ISET) of the power management chip is connected to the first end of the 50th resistor, and the second end of the 50th resistor is grounded. The power ground pin and the power enable pin of the power management chip are connected, and both the power ground pin and the power enable pin are grounded. The enable output pin of the power management chip is connected to the first end of the 49th resistor, and the second end of the 49th resistor is grounded. The first output pin and the second output pin of the power management chip are connected, and the first output pin is connected to the first end of the 18th capacitor, and the second end of the 18th capacitor is grounded. The second output pin is connected to the first end of the 19th capacitor, and the second end of the 19th capacitor is grounded. The first boost output intermediate node pin of the power management chip is connected to the first end of the 15th capacitor, and the second end of the 15th capacitor is grounded. The second boost output intermediate node pin of the power management chip is connected to the first end of the 16th capacitor, and the second end of the 16th capacitor is grounded.

[0019] The power supply circuit provided by this utility model can output multiple adapted power supply voltages to power peripheral functional modules while managing the charging and discharging of lithium batteries. It can also expand multiple expansion interfaces to connect other functional modules, thereby meeting the power supply needs of the development board circuit in various working scenarios.

[0020] Figure 1 For one of the schematic diagrams of the multifunctional power supply circuit provided in the embodiments of this utility model, please refer to [link / reference]. Figure 1As shown, the multifunctional power supply circuit provided by this utility model includes: a power management chip U1, a first inductor L1, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a fortieth resistor R40, a fiftieth resistor R50, and a fifty-second resistor R52.

[0021] Among them, the first switching node pin LX (i.e., pin 17 of the power management chip), the second switching node pin (i.e., pin 16 of the power management chip), and the third switching node pin (i.e., pin 15 of the power management chip) of the power management chip U1 are all connected to the first end of the first inductor L1. The second end of the first inductor L1 is used to receive the power supply voltage IP_VCC. The second end of the first inductor L1 is connected to the first end of the fifty-second resistor R52, the first end of the twenty-first capacitor C21, and the first end of the twentieth capacitor C20, respectively. The second end of the fifty-second resistor R52 is connected to the first end of the twenty-second capacitor C22. The second ends of the twenty-second capacitor C22, the twenty-first capacitor C21, and the twentieth capacitor C20 are all grounded to GND.

[0022] Among them, the temperature detection pin NTC of the power management chip U1 is connected to the first end of the 33rd resistor, and the second end of the 33rd resistor R33 is grounded to GND; the positive signal transmission pin DP and the negative signal transmission pin DM of the power management chip U1 are used to connect to the peripheral interface chip to supply power to the peripheral interface chip.

[0023] Specifically, the charging selection pin CON_SEL of the power management chip U1 is connected to the first end of the 40th resistor R40, and the second end of the 40th resistor R40 is grounded. The charging current setting pin ISET of the power management chip U1 is connected to the first end of the 50th resistor R50, and the second end of the 50th resistor R50 is grounded to GND.

[0024] In this circuit, the power ground pin PGND and the power enable pin EP of the power management chip U1 are connected, and both the power ground pin PGND and the power enable pin EP are grounded to GDN; the enable output pin EN of the power management chip U1 is connected to the first end of the forty-ninth resistor R49, and the second end of the forty-ninth resistor R49 is grounded.

[0025] The first output pin (pin 21) and the second output pin (pin 22) of the power management chip U1 are connected. The first output pin is connected to the first end of the eighteenth capacitor C18, and the second end of the eighteenth capacitor C18 is grounded to GND. The second output pin is connected to the first end of the nineteenth capacitor C19, and the second end of the nineteenth capacitor C19 is grounded to GND.

[0026] Specifically, the first boost output intermediate node pin of the power management chip U1 (i.e., pin 20 of the power management chip) is connected to the first end of the fifteenth capacitor C15, and the second end of the fifteenth capacitor C15 is grounded to GND; the second boost output intermediate node pin of the power management chip U1 (i.e., pin 19 of the power management chip) is connected to the first end of the sixteenth capacitor, and the second end of the sixteenth capacitor is grounded to GND.

[0027] Please continue reading Figure 1 As shown, in one embodiment of this utility model, the multifunctional power supply circuit further includes a 51st resistor R51 and a first light-emitting diode LED1; the display pin LED of the power management chip U1 is connected to the first end of the 51st resistor R51, the second end of the 51st resistor R51 is connected to the positive terminal of the first light-emitting diode LED1, and the negative terminal of the first light-emitting diode LED1 is grounded to GND. The first light-emitting diode LED1 is used for charging status indication, displaying "charging" or "fully charged" through the LED1 driving circuit.

[0028] In one embodiment of this utility model, the power management chip U1 can be a power management chip of model IP2326. IP2326 realizes intelligent management of two power supplies: external 5V (VBUS) and lithium battery (VBAT), and provides VSYS system bus, while also being supplemented with 3.3V output and multiple expansion interfaces.

[0029] The power management chip U1 incorporates a built-in buck-boost switching field-effect transistor (FET), eliminating the need for external Schottky diodes or independent power MOSFETs, allowing the system to seamlessly switch between USB and battery power.

[0030] Among them, the fifty-second resistor R52 is a high-precision current shunt resistor that samples the battery charging and discharging current and sends it to the internal ADC sampling module of IP2326 via the VSENSE pin.

[0031] In this embodiment, the 33rd resistor R33 is 51KΩ. This 33rd resistor R33 is connected to the temperature detection pin NTC to monitor the battery temperature. If the temperature exceeds the set temperature, charging will be automatically suspended to protect the safety of the entire circuit.

[0032] Specifically, the input pin VIN of power management chip U1 is connected to the first terminal of the twenty-second capacitor C22, the bootstrap capacitor pin BST of power management chip U1 is connected to the first terminal of the seventeenth capacitor C17, and the second terminal of the seventeenth capacitor C17 is connected to the first terminal of the first inductor L1. The input pin VIN (i.e., pin 13) of power management chip U1 is used to receive USB VBUS or other 5V power input, which is then filtered and supplied to the internal circuitry of Buck / Boost.

[0033] The three switching node pins LX and the bootstrap capacitor pin BST together constitute the synchronous buck-boost converter. The two boost output intermediate node pins VSYS (pins 19 and 20) of the power management chip U1 serve as the system output bus, automatically switching between the input pin VIN and the battery power supply terminal BAT+ to ensure a stable power supply for the circuit system.

[0034] Among them, the two output pins of the power management chip U1 (i.e., pins 21 and 22 of the power management chip U1) are float charging circuit outputs used to charge the battery (typically 4.2 V charging completion voltage).

[0035] Among them, the charging current setting pin ISET of the power management chip U1 provides the set charging current to the external device after passing through the fiftieth resistor R50. The resistance value of the fiftieth resistor R50 is adjusted according to the power supply current requirements.

[0036] The enable output pin EN of the power management chip U1 is active high, and the system can be enabled / disabled by software. When the enable output pin EN is low, all outputs are pulled low.

[0037] Among them, the output pins VIN_UVSET and VIN_OVSET (i.e. pins 8 and 9 of the power management chip U1) are used to set the input undervoltage and overvoltage thresholds to protect the upstream power supply.

[0038] Figure 2 For a schematic diagram of the first voltage conversion circuit structure provided in this embodiment of the present invention, please refer to [link / reference]. Figure 1 As shown, the multifunctional power supply circuit provided in this embodiment also includes a first voltage conversion circuit, which includes a first voltage conversion chip U2, a thirty-second capacitor C32, a thirty-seventh capacitor C37, a forty-first capacitor C41, a forty-second capacitor C42, a forty-third capacitor C43, and a second inductor L2.

[0039] In this circuit, the enable pin EN and the input pin VIN of the first voltage converter chip U2 are connected, and both the enable pin EN and the input pin VIN are used to receive the power supply voltage VCC. The enable pin EN is connected to the first terminal of the forty-second capacitor C42, and the second terminal of the forty-second capacitor C42 is grounded to GND. The input pin VIN is connected to the first terminal of the thirty-second capacitor C32, and the second terminal of the thirty-second capacitor C32 is grounded to GND. The switch control pin SW of the first voltage converter chip U2 is connected to the first terminal of the second inductor L2, and the second terminal of the second inductor L2 is connected to the first terminals of the forty-first capacitor C41 and the forty-third capacitor C43, respectively. The second terminals of the forty-first capacitor C41 and the forty-third capacitor C43 are both grounded to GND. The bootstrap capacitor pin BST of the first voltage converter chip U2 is connected to the first terminal of the thirty-seventh capacitor C37, and the second terminal of the thirty-seventh capacitor C37 is connected to the first terminal of the second inductor L2. The second terminal of the second inductor L2 is used to output the second power supply voltage of 3.3V. The first end of the second inductor L2 is also connected to the feedback pin FB of the first voltage conversion chip U2, and the ground pin of the first voltage conversion chip U2 is connected to the common ground GND.

[0040] The multi-functional power supply circuit also includes a second light-emitting diode (LED2), a third light-emitting diode (LED3), a forty-third resistor (R43), and a second resistor (R2). The first terminal of the forty-third resistor (R43) is used to receive the first supply voltage of 5V, and the second terminal of the forty-third resistor (R43) is connected to the positive terminal of the second light-emitting diode (LED2), and the negative terminal of the second light-emitting diode (LED2) is grounded to GND. The first terminal of the second resistor (R2) is connected to the second terminal of the second inductor (L2), and the second terminal of the second resistor (R2) is connected to the positive terminal of the third light-emitting diode (LED3), and the negative terminal of the third light-emitting diode (LED3) is grounded to GND.

[0041] The multi-functional power supply circuit in this embodiment also includes multiple expansion interfaces. The input terminals of these expansion interfaces are connected to either the first boost output intermediate node pin or the second boost output intermediate node pin of the power management chip. These expansion interfaces are used to power other functional modules. For details, please refer to [link to previous section]. Figure 1 As shown, the multi-functional power supply circuit in this embodiment includes four expansion interfaces, namely CN3-CN6. These four expansion interfaces provide power to other processing chips, sensors, communication modules, etc. In addition, each expansion interface shares a common ground with the system ground to ensure the shortest return path and reduce the circuit's Electromagnetic Interference (EMI).

[0042] Please continue reading Figure 1As shown, the multi-functional power supply circuit of this embodiment also includes an external terminal P1, which is model SS-12D10G5. The external terminal P1 has a dual-channel MOSFET and is used for input reverse connection and surge suppression.

[0043] Please continue reading Figure 1 As shown, the multi-functional power supply circuit of this embodiment also includes a lithium battery terminal P2, specifically terminal model WJ126V-5.0-2P. Additionally, Figure 1 BAT+ and BAT_GND are used to connect the two terminals of the battery.

[0044] In the first voltage conversion circuit, the second inductor L2 can be 6.8uH. The second inductor L2, the thirtieth capacitor C32, the thirtieth capacitor C37, the forty-first capacitor C41, and the forty-second capacitor C42 together form a rectifier Buck circuit to provide a 3.3V voltage to the microprocessor and its peripheral components.

[0045] The output voltage of the first voltage conversion circuit is used as a power indicator by the second light-emitting diode LED2 and the third light-emitting diode LED3.

[0046] Figure 3 For a structural schematic diagram of the multifunctional power supply circuit provided in the embodiment of this utility model, please refer to [link / reference]. Figure 3 As shown, the multifunctional power supply circuit provided in this embodiment also includes a second voltage conversion circuit, which includes a second voltage conversion chip U3, a first capacitor C1, a third capacitor C3, a seventh capacitor C7, a twenty-third capacitor C23, a second Zener diode D2, a third inductor L3, a twentieth resistor R20, and a fifty-second resistor R52.

[0047] Specifically, the input pin VIN of the second voltage converter chip U3 is connected to the first terminal of the third capacitor C3, which receives the power supply voltage VCC. The second terminal of the third capacitor C3 is grounded to GND. The power enable pin EP and the ground pin of the second voltage converter chip U3 are both grounded to GND. The phase compensation pin PH of the second voltage converter chip is connected to the first terminal of the third inductor L3 and the negative terminal of the second Zener diode D2, respectively. The positive terminal of the second Zener diode D2 is grounded to GND. The second terminal of the third inductor L3 is connected to the first terminal of the twenty-third capacitor C23, the first terminal of the seventh capacitor C7, and the first terminal of the twentieth resistor R20, respectively. The second terminals of the twenty-third capacitor C23 and the seventh capacitor C7 are both grounded to GND. The second terminal of the twentieth resistor R20 is connected to the first terminal of the fifty-second resistor R52, which is grounded. The second terminal of the third inductor L3 is used to output the first power supply voltage 5V.

[0048] Please continue reading Figure 3 As shown, in one embodiment of this utility model, the second voltage conversion circuit further includes a fourth capacitor C4 and a fifth capacitor C5; the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5 are both connected to the input pin of the second voltage conversion chip U3, and the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5 are both grounded to GND.

[0049] Among them, the third capacitor C3 and the fifth capacitor C5 can be 4.7uF / 50V capacitors, the first capacitor C1 can be a 100nF / 100V capacitor, and the fourth capacitor C4 can be a 10nF / 100V capacitor. The first capacitor C1, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 work together to suppress EMI and input surges.

[0050] The second voltage conversion chip U3 is the boost / buck DC-DC switching regulator in the module. Through its cooperation with external inductors, capacitors, and feedback voltage divider network, this circuit board can consistently provide a stable, low-noise, and high-efficiency power supply to the +5V peripheral bus from various power sources such as battery, USB, and DC input.

[0051] In this circuit, the phase compensation pin PH of the second voltage conversion chip U3 is connected to an external 4.7 µH–15 µH third inductor L3. The output is filtered by a large-capacity electrolytic capacitor (a fourth capacitor C4 with a specification of 4.7 µF / 50 V) and ceramic capacitors (a third capacitor C3 with a specification of 4.7 µF / 50 V and a 100 nF / 100 V), ensuring that the rail ripple of the output +5 V voltage is extremely low. The feedback network uses the twentieth resistor R20 and the fifty-second resistor R52 to divide the voltage and feed it back to the feedback pin FB to precisely control the output voltage to 5.0 V.

[0052] Figure 4 Please refer to the schematic diagram of the peripheral interface circuit structure provided in the embodiment of this utility model. Figure 4 As shown, the peripheral interface circuit specifically provided in this embodiment is a USB interface circuit. The positive terminal of the USB interface pin of the control chip is electrically connected to the positive terminal DP2 of the signal transmission of the peripheral interface circuit, and the negative terminal of the USB interface pin of the control chip is electrically connected to the negative terminal ND2 of the signal transmission of the peripheral interface circuit, so that the control chip can communicate with the electronic device connected to the peripheral interface circuit.

[0053] The peripheral interface circuit includes a peripheral interface chip, a tenth resistor R10, and an eleventh resistor R11. The first communication pin CC1 of the peripheral interface chip is connected to a ground pin via the eleventh resistor R11, and the second communication pin CC2 is connected to a ground pin via the tenth resistor R10. The bus pin VBUS on the peripheral interface chip is electrically connected to the USB_V terminal on the port. The USB_V terminal is used for communication or power supply to connected peripheral devices. Additionally, the USB_V terminal in the peripheral interface circuit is electrically connected to the USB_5V power supply terminal via a first fuse F1, which provides overvoltage and overcurrent protection. Furthermore, in this embodiment, the auxiliary channel pins SBU1 and SBU2 on the peripheral interface chip are both floating; in other words, the first fuse F1 is a high-side self-resetting fuse that disconnects to protect USB VBUS during overcurrent.

[0054] In one embodiment of this utility model, the peripheral interface chip can specifically adopt a Type-C female connector, which supports reversible plugs and automatic negotiation of 5V device (UFP) mode, eliminating the need for the user to determine the orientation. The peripheral interface chip has CC1 / CC2 pins for negotiating the power role. The eleventh resistor R11 and the tenth resistor R10 are both 5.1 kΩ resistors. The eleventh resistor R11 and the tenth resistor R10 pull down the CC1 and CC2 pins to GND respectively, telling the host that "this end is a device (UFP)," causing the host to output 5V on VBUS. If pulled high (when not in use), no output will be made.

[0055] As can be seen, the multi-functional power supply circuit provided in this embodiment integrates USB-C (or USB-A) input, lithium battery charging and discharging management, automatic power path switching, buck-boost conversion, and multiple regulated outputs. The power management chip U1 realizes intelligent management of two power supplies: external 5V (VBUS) and lithium battery (VBAT), and provides the VSYS system bus, while also providing 3.3V buck output and multiple expansion interfaces.

[0056] This embodiment, through the high integration of the power management chip U1 and its coordination with peripheral filtering and detection circuits, has the following advantages compared to power supply circuits in related technologies: 1. Automatic power path switching: Seamless switching between USB and battery ensures uninterrupted system power supply. 2. High efficiency buck-boost capability: It can stably output system voltage under different battery voltages. 3. Comprehensive protection: NTC temperature monitoring, overcurrent, short circuit, under / overvoltage protection, and USB port reverse protection. 4. Abundant interfaces: Standard USB-C / A, lithium battery interface and multiple system outputs, making it easy to expand MCU, peripherals and communication modules. This embodiment provides a power supply circuit that significantly simplifies the circuit structure, improves reliability, and enhances system integration and security compared to traditional discrete solutions. The power supply circuit provided in this embodiment can be applied to fields such as intelligent vehicles, unmanned vehicle chassis, portable IoT sensing terminals, handheld smart devices, educational development boards, and power management for wearable devices.

[0057] This utility model embodiment also provides a power supply device, which includes the multifunctional power supply circuit provided in any of the above embodiments.

[0058] It is understood that the working principle and technical effect of the power supply device provided in this embodiment can be referred to the power supply circuits provided in the above embodiments, and will not be repeated here.

[0059] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included 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 multi-functional power supply circuit, characterized by comprising: The power supply circuit includes: a power management chip, a first inductor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a fortieth resistor, a fiftieth resistor, and a fifty-second resistor; The first, second, and third switch node pins of the power management chip are all connected to the first end of the first inductor. The second end of the first inductor is used to receive the power supply voltage. The second end of the first inductor is connected to the first end of the fifty-second resistor, the first end of the twenty-first capacitor, and the first end of the twenty-tenth capacitor, respectively. The second end of the fifty-second resistor is connected to the first end of the twenty-second capacitor. The second ends of the twenty-second, twenty-first, and twenty-tenth capacitors are all grounded. The input pin of the power management chip is connected to the first end of the twenty-second capacitor. The bootstrap capacitor pin of the power management chip is connected to the first end of the seventeenth capacitor. The second end of the seventeenth capacitor is connected to the first end of the first inductor. The temperature detection pin of the power management chip is connected to the first end of the 33rd resistor, and the second end of the 33rd resistor is grounded; the positive and negative signal transmission pins of the power management chip are respectively used to connect to the peripheral interface chip. The charging selection pin of the power management chip is connected to the first end of the fortieth resistor, the second end of the fortieth resistor is grounded, the charging current setting pin ISET of the power management chip is connected to the first end of the fiftieth resistor, and the second end of the fiftieth resistor is grounded. The power ground pin and the power enable pin of the power management chip are connected, and both the power ground pin and the power enable pin are grounded; the enable output pin of the power management chip is connected to the first end of the forty-ninth resistor, and the second end of the forty-ninth resistor is grounded. The power management chip has its first output pin and second output pin connected together, and the first output pin is connected to the first terminal of the eighteenth capacitor, while the second terminal of the eighteenth capacitor is grounded; the second output pin is connected to the first terminal of the nineteenth capacitor, while the second terminal of the nineteenth capacitor is grounded. The first boost output intermediate node pin of the power management chip is connected to the first end of the fifteenth capacitor, and the second end of the fifteenth capacitor is grounded; the second boost output intermediate node pin of the power management chip is connected to the first end of the sixteenth capacitor, and the second end of the sixteenth capacitor is grounded.

2. The multi-functional power supply circuit according to claim 1, characterized by, The multi-functional power supply circuit also includes a fifty-first resistor and a first light-emitting diode; The LED display pin of the power management chip is connected to the first end of the fifty-first resistor, the second end of the fifty-first resistor is connected to the positive terminal of the first light-emitting diode, and the negative terminal of the first light-emitting diode is grounded.

3. The multi-functional power supply circuit according to claim 1, wherein The multi-functional power supply circuit also includes a first voltage conversion circuit, which includes a first voltage conversion chip, a thirty-second capacitor, a thirty-seventh capacitor, a forty-first capacitor, a forty-second capacitor, a forty-third capacitor, and a second inductor. The enable pin and input pin of the first voltage conversion chip are connected, and both the enable pin and the input pin are used to receive power supply voltage; the enable pin is connected to the first terminal of the forty-second capacitor, the second terminal of the forty-second capacitor is grounded, and the input pin is connected to the first terminal of the thirty-second capacitor, the second terminal of the thirty-second capacitor is grounded. The switching control pin of the first voltage conversion chip is connected to the first end of the second inductor, and the second end of the second inductor is connected to the first end of the forty-first capacitor and the first end of the forty-third capacitor, respectively. The second ends of the forty-first capacitor and the forty-third capacitor are both grounded. The bootstrap capacitor pin of the first voltage conversion chip is connected to the first end of the thirty-seventh capacitor, and the second end of the thirty-seventh capacitor is connected to the first end of the second inductor. The second end of the second inductor is used to output the second supply voltage. The first end of the second inductor is also connected to the feedback pin of the first voltage conversion chip, and the ground pin of the first voltage conversion chip is connected to the common ground.

4. The multi-functional power supply circuit according to claim 3, wherein The multi-functional power supply circuit also includes a second light-emitting diode, a third light-emitting diode, a forty-third resistor, and a second resistor; The first end of the forty-third resistor is used to receive the first power supply voltage, the second end of the forty-third resistor is connected to the positive terminal of the second light-emitting diode, and the negative terminal of the second light-emitting diode is grounded; The first end of the second resistor is connected to the second end of the second inductor, the second end of the second resistor is connected to the positive terminal of the third light-emitting diode, and the negative terminal of the third light-emitting diode is grounded.

5. The multi-functional power supply circuit according to claim 1, wherein The multi-functional power supply circuit also includes multiple expansion interfaces. The input terminal of the expansion interface is connected to the first boost output intermediate node pin or the second boost output intermediate node pin of the power management chip. The expansion interface is used to supply power to other functional modules.

6. The multi-functional power supply circuit according to claim 1, wherein The multi-functional power supply circuit also includes a second voltage conversion circuit, which includes a second voltage conversion chip, a first capacitor, a third capacitor, a seventh capacitor, a twenty-third capacitor, a second Zener diode, a third inductor, a twentieth resistor, and a fifty-second resistor. The input pin of the second voltage conversion chip is connected to the first end of the third capacitor. The first end of the third capacitor is used to receive the power supply voltage, and the second end of the third capacitor is grounded. The power enable pin and the ground pin of the second voltage conversion chip are both grounded. The phase compensation pin PH of the second voltage conversion chip is connected to the first terminal of the third inductor and the negative terminal of the second Zener diode, respectively. The positive terminal of the second Zener diode is grounded. The second terminal of the third inductor is connected to the first terminal of the twenty-third capacitor, the first terminal of the seventh capacitor, and the first terminal of the twentyth resistor, respectively. The second terminals of the twenty-third capacitor and the seventh capacitor are both grounded. The second terminal of the twentyth resistor is connected to the first terminal of the fifty-second resistor, and the second terminal of the fifty-second resistor is grounded. The second terminal of the third inductor is used to output the first supply voltage.

7. The multi-functional power supply circuit according to claim 6, wherein The second voltage conversion circuit also includes a fourth capacitor and a fifth capacitor; The first terminal of the fourth capacitor and the first terminal of the fifth capacitor are both connected to the input pin of the second voltage conversion chip, and the second terminals of the fourth capacitor and the fifth capacitor are both grounded.

8. A power supply device characterized by comprising: The power supply device includes the multifunctional power supply circuit as described in any one of claims 1-7.

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