Multi-power stable power supply circuits and electronic equipment

Abstract

This invention provides a multi-power supply stable power supply circuit and electronic device, relating to the field of power management technology. By introducing a unidirectional freewheeling element and a pre-charging path, with a current-limiting resistor included in the pre-charging path, and integrating a transient voltage maintenance mechanism and a pre-charging / surge suppression mechanism, it not only avoids voltage drops during initial power-on and prevents the main control system from restarting, but also effectively suppresses inrush current during power switching, protecting devices such as MOSFETs in the main control system and preventing voltage drops in the output voltage of the voltage stabilization circuit. Furthermore, by adopting an architecture combining a microcontroller unit with a battery power supply circuit, a charging circuit, and a voltage stabilization circuit, it replaces expensive and highly integrated dedicated power management chips, significantly reducing costs. Through the configuration of the microcontroller unit, flexible timing management and state switching can be achieved.

Description

Technical Field

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

[0002] As consumer electronics devices become increasingly feature-rich, their power supply methods are also becoming more diversified, such as supporting wired charging, wireless charging, and battery power simultaneously. With multiple power supply methods coexisting, achieving smooth switching between power sources, preventing system restarts due to voltage drops, and effectively suppressing inrush currents during connection have become key challenges in power supply design.

[0003] Currently, common multi-power management solutions mainly fall into two categories: one is to use highly integrated power management ICs (PMICs) to achieve multi-power path management and switching, and the other is to use basic switching circuits based on discrete MOSFETs, diodes, and simple logic control.

[0004] Power management chips can automatically switch power supply paths when an external power source is detected, and they also have surge suppression and path isolation functions. However, they are expensive and usually tied to specific platforms, lacking flexibility and difficult to port to ordinary electronic devices. Basic switching circuits are less expensive, but they do not systematically consider inrush current and voltage drops during switching, or they only limit the initial current with a simple pre-charge resistor. They lack coordinated handling of inrush current and transient voltage drops during switching, which can easily lead to system instability, system restarts, or device damage. Utility Model Content

[0005] This invention provides a multi-power stable power supply circuit and electronic device to overcome the deficiencies in the prior art.

[0006] This utility model provides a multi-power stable power supply circuit, including: a microcontroller unit, a battery power supply circuit, a charging circuit, and a voltage stabilization circuit; The battery power supply circuit includes a battery, a controlled power supply circuit, and a unidirectional freewheeling element; the voltage stabilization circuit includes a DC-DC converter, a power supply path, and a pre-charge path; the pre-charge path includes a current-limiting resistor. The battery is connected to the positive terminal of the unidirectional freewheeling element and the voltage input terminal of the controlled power supply circuit, respectively. The negative terminal of the unidirectional freewheeling element is connected to the voltage output terminal of the controlled power supply circuit. The voltage output terminal of the controlled power supply circuit and the charging circuit are both connected to the input terminal of the DC-DC converter. The output terminal of the DC-DC converter is connected to the power supply path and the pre-charge path, respectively, and the power supply path and the pre-charge path are connected to the main control system, respectively. The microcontroller unit is connected to the controlled terminals of the controlled power supply circuit, the charging circuit, the voltage stabilization circuit, the power supply path, and the pre-charging path, respectively. The microcontroller unit is configured to switch the conduction state of the controlled power supply circuit and the charging circuit, and to switch the conduction state of the power supply path and the pre-charging path.

[0007] According to the present invention, a multi-power stable power supply circuit is provided, wherein the controlled power supply circuit includes a first MOSFET, a first capacitor, a second capacitor, a third capacitor, a first transistor, a first resistor, a second resistor, and a third resistor; The voltage input terminal of the controlled power supply circuit is grounded through the first capacitor; The voltage output terminal of the controlled power supply circuit is grounded through the second capacitor; The drain of the first MOSFET is connected to the voltage input terminal of the controlled power supply circuit; The drain of the first MOS transistor is connected to the gate of the first MOS transistor through the third capacitor and the first resistor; The controlled terminal of the controlled power supply circuit is connected to the base of the first transistor through the second resistor, the emitter of the first transistor is connected to the voltage input terminal of the controlled power supply circuit, and the collector of the first transistor is grounded through the third resistor and connected between the third capacitor and the first resistor.

[0008] According to the present invention, a multi-power stable power supply circuit is provided, wherein the charging circuit includes a second MOSFET, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second transistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor. The voltage input terminal of the charging circuit is grounded through the fourth capacitor; The voltage output terminal of the charging circuit is grounded through the fifth capacitor; The drain of the second MOSFET is connected to the voltage input terminal of the charging circuit; The drain of the second MOS transistor is connected to the gate of the second MOS transistor through the sixth capacitor and the fourth resistor, respectively; The controlled terminal of the charging circuit is connected to the base of the second transistor through the fifth resistor, the collector of the second transistor is connected to the gate of the second MOS transistor through the sixth resistor, the base of the second transistor is connected to the emitter of the second transistor through the seventh resistor, and the emitter of the second transistor is grounded.

[0009] According to the present invention, a multi-power stable power supply circuit is provided, wherein the power supply path includes a third MOSFET and an eighth resistor; The drain of the third MOS transistor is connected to the output terminal of the DC-DC converter; The controlled terminal of the power supply path is connected to the gate of the third MOS transistor and to the drain of the third MOS transistor through the eighth resistor. The source of the third MOS transistor is connected to the main control system.

[0010] According to the multi-power stable power supply circuit provided by this utility model, the pre-charge path further includes a fourth MOS transistor and a ninth resistor; The current-limiting resistor is connected between the output terminal of the DC-DC converter and the drain of the fourth MOS transistor; The controlled terminal of the pre-charge path is connected to the gate of the fourth MOS transistor and to the drain of the fourth MOS transistor through the ninth resistor; The source of the fourth MOS transistor is connected to the main control system.

[0011] According to the present invention, a multi-power stable power supply circuit is provided, wherein the charging circuit includes multiple components; The multi-power stable power supply circuit also includes a sampling circuit corresponding to each of the charging circuits; Each of the aforementioned sampling circuits is connected to the microcontroller unit; Each of the sampling circuits is used to sample the input voltage of the corresponding charging circuit to obtain a sampling result; The microcontroller unit is also configured to determine the switching trigger event corresponding to each of the sampling results.

[0012] According to the present invention, a multi-power stable power supply circuit is provided, wherein the voltage stabilizing circuit further includes a seventh capacitor; The voltage output terminal of the voltage stabilization circuit is grounded through the seventh capacitor.

[0013] According to the multi-power stable power supply circuit provided by this utility model, the unidirectional freewheeling element is a Schottky diode.

[0014] This utility model also provides an electronic device, including a main control system and the above-mentioned multi-power stable power supply circuit.

[0015] According to the present invention, an electronic device includes an intelligent robot.

[0016] This invention provides a multi-power supply stable power supply circuit and electronic device. By introducing a unidirectional freewheeling element and a pre-charging path, with a current-limiting resistor included in the pre-charging path, and integrating a transient voltage maintenance mechanism and a pre-charging / surge suppression mechanism, it not only avoids voltage drops during initial power-on and prevents the main control system from restarting, but also effectively suppresses surge current during power switching, protecting devices such as MOSFETs in the main control system and preventing voltage drops in the output voltage of the voltage stabilization circuit. This overcomes the limitations of traditional discrete solutions that can only address a single problem. Furthermore, by adopting an architecture combining a microcontroller unit with battery power supply circuits, charging circuits, and voltage stabilization circuits, it achieves a reliability level approaching that of high-end integrated power management chips while maintaining the advantages of a low-cost discrete architecture. This allows it to replace expensive and highly integrated dedicated power management chips, significantly reducing costs and achieving an optimal balance between cost and performance. Flexible timing management and state switching can be achieved through the configuration of the microcontroller unit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the multi-power stable power supply circuit provided by this utility model.

[0019] Figure 2 This is a schematic diagram of the battery power supply circuit in the multi-power stable power supply circuit provided by this utility model.

[0020] Figure 3 This is a schematic diagram of the charging circuit in the multi-power stable power supply circuit provided by this utility model.

[0021] Figure 4 This is a schematic diagram of the voltage stabilization circuit in the multi-power supply stable power supply circuit provided by this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the electronic device provided by this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Figure 1 This is a schematic diagram of a multi-power stable power supply circuit provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the multi-power stable power supply circuit includes a microcontroller unit (MCU) 1, a battery power supply circuit 2, a charging circuit 3, and a voltage stabilization circuit 4. The battery power supply circuit 2 includes a battery 21, a controlled power supply circuit 22 and a unidirectional freewheeling element 23. The voltage stabilization circuit 4 includes a DC-DC converter (DCDC) U1, a power supply path 41 and a pre-charge path 42. The pre-charge path 42 includes a current limiting resistor R0. The battery 21 is connected to the positive terminal of the unidirectional freewheeling element 23 and the voltage input terminal of the controlled power supply circuit 22, respectively, and the negative terminal of the unidirectional freewheeling element 23 is connected to the voltage output terminal of the controlled power supply circuit 22. The voltage output terminal of the controlled power supply circuit 22 and the charging circuit 3 are both connected to the input terminal of the DC-DC converter U1. The output terminal of the DC-DC converter U1 is connected to the power supply path 41 and the pre-charging path 42 respectively. The power supply path 41 and the pre-charging path 42 are connected to the main control system 5 respectively. The microcontroller unit 1 is connected to the controlled terminals of the controlled power supply circuit 22, the charging circuit 3, the voltage stabilization circuit 4, the power supply path 41, and the pre-charging path 42, respectively. The microcontroller unit 1 is configured to switch the conduction state of the controlled power supply circuit 22 and the charging circuit 3, and to switch the conduction state of the power supply path 41 and the pre-charging path 42.

[0025] Specifically, in this embodiment of the invention, both the battery power supply circuit 2 and the charging circuit 3 can serve as power sources for the main control system 5. The charging circuit 3 may include at least one circuit, and the charging principles of each circuit 3 may differ. For example, it may include a wired charging circuit and a wireless charging circuit. The wired charging circuit can supply power to the main control system 5 via a data cable and a USB interface.

[0026] Understandably, the multi-power supply stable power supply circuit can not only solve the power switching problem between wired and wireless charging, but also achieve stable power switching even when multiple power sources are involved. Simultaneously, voltage stabilization circuit 4 can connect to more main control systems requiring power, and using the same circuit can ensure power supply stability, even in the event of a large inrush current when power is needed.

[0027] When switching power between battery power supply circuit 2 and charging circuit 3, the power supply voltage VOUT may be briefly pulled low at the moment of switching from battery power to charging circuit power. This situation may cause the output voltage VDD of DC-DC converter U1 and the output voltage Vsystem of voltage stabilization circuit 4 to be briefly pulled low, resulting in a power failure and restart of the main control system. Both VDD and Vsystem can be 3.3V.

[0028] Since the battery power supply circuit 2 includes a unidirectional freewheeling element 23, and the controlled power supply circuit 22 is connected in parallel with the unidirectional freewheeling element 23, when the power supply is switched, the unidirectional freewheeling element 23, with its ultra-fast response speed and excellent overcurrent capability, can promptly provide the power supply voltage VOUT from the battery VBAT through the unidirectional freewheeling element 23, ensuring that the power supply voltage VOUT is clamped at a relatively safe value, so that VDD and Vsystem will not be pulled low, and the main control system can operate stably without restarting.

[0029] The battery VBAT is powered by the unidirectional freewheeling element 23 only when the supply voltage VOUT is about to drop. This situation can only occur at the moment of power switching. Therefore, the unidirectional freewheeling element 23 will not have a large current flowing through it for a long time. This can avoid the situation where the unidirectional freewheeling element 23 heats up severely due to a large current flowing through it for a long time, which would lead to a decrease in the power supply efficiency of the entire multi-power stable power supply circuit.

[0030] When the main control system 5 is powered off, it cannot be powered. If it were powered on at this time, and power supply path 41 were used to convert VDD to Vsystem, a huge surge current would be generated instantaneously, which might burn out components such as MOSFETs in the main control system 5, or cause the power supply voltage to drop, resulting in a restart of the main control system. Therefore, a pre-charge path 42 is introduced. In such a working scenario, the microcontroller unit 1 first controls power supply path 41 to disconnect and controls pre-charge path 42 to conduct, allowing VDD to reach the main control system 5 through pre-charge path 42. Since pre-charge path 42 includes a current-limiting resistor R0, the large-capacity capacitor at the back end is pre-charged through the current-limiting resistor R0, preventing a large current. When the MCU detects that Vsystem has reached the required voltage of the main control system 5, it controls pre-charge path 42 to disconnect and controls power supply path 41 to conduct, allowing VDD to reach the main control system 5 through power supply path 41, restoring normal operation.

[0031] The controlled terminal of the controlled power supply circuit is at a low level by default, and the default state of the controlled power supply circuit is on. The controlled terminal of the charging circuit is at a low level by default, and the default state of the charging circuit is off. Generally, the voltage at the voltage input terminal of the charging circuit is higher than the battery voltage VBAT.

[0032] The DC-DC converter in the voltage stabilization circuit always operates normally. The controlled terminal of power supply path 41 is at a low level by default, and the default state of power supply path 41 is on. The controlled terminal of pre-charge path 42 is at a high level of 3.3V by default, and the default state of pre-charge path 42 is not on.

[0033] The multi-power stable power supply circuit provided in this embodiment of the invention introduces a unidirectional freewheeling element and a pre-charging path, including a current-limiting resistor in the pre-charging path. It also integrates a transient voltage maintenance mechanism and a pre-charging / surge suppression mechanism. This not only prevents voltage drops during initial power-on and avoids system restarts, but also effectively suppresses surge currents during power switching, protecting devices such as MOSFETs in the main control system and preventing voltage drops in the voltage stabilization circuit. This overcomes the limitations of traditional discrete solutions that can only address a single problem. Furthermore, by adopting an architecture combining a microcontroller unit with battery power supply, charging, and voltage stabilization circuits, it achieves a reliability level approaching that of high-end integrated power management chips while maintaining the advantages of a low-cost discrete architecture. This allows it to replace expensive and highly integrated dedicated power management chips, significantly reducing costs and achieving an optimal balance between cost and performance. Flexible timing management and state switching can be achieved through the configuration of the microcontroller unit.

[0034] Through the microcontroller unit, intelligent timing control can be achieved, completing the entire process management from complete power-off to normal power supply, as well as hot switching between different power sources, significantly improving the continuity and stability of power supply.

[0035] Based on the above embodiments, the unidirectional freewheeling element can be a Schottky diode. Utilizing the fast conduction and low forward voltage drop characteristics of the Schottky diode, voltage drops in the supply supply can be further prevented, thus avoiding a restart of the main control system.

[0036] like Figure 2 As shown, the controlled power supply circuit includes a first MOSFET Q1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first transistor C4, a first resistor R1, a second resistor R2, and a third resistor R3. The voltage input terminal of the controlled power supply circuit is grounded through the first capacitor C1; The voltage output terminal of the controlled power supply circuit is grounded through the second capacitor C2; The drain of the first MOSFET Q1 is connected to the voltage input terminal of the controlled power supply circuit; The drain of the first MOSFET Q1 is connected to the gate of the first MOSFET Q1 through the third capacitor C3 and the first resistor R1. The controlled terminal of the controlled power supply circuit is connected to the base of the first transistor C4 through the second resistor R2. The emitter of the first transistor C4 is connected to the voltage input terminal of the controlled power supply circuit. The collector of the first transistor C4 is grounded through the third resistor R3 and connected between the third capacitor C3 and the first resistor R1.

[0037] Specifically, Figure 2 In this circuit, the voltage at the input terminal of the controlled power supply circuit is VBUS1, and the voltage at the output terminal of the controlled power supply circuit is the supply voltage VOUT. The unidirectional freewheeling element can be a Schottky diode D1, with the anode of Schottky diode D1 connected to the input terminal of the controlled power supply circuit and the cathode of Schottky diode D1 connected to the output terminal of the controlled power supply circuit.

[0038] The controlled terminal of the controlled power supply circuit is at a low level by default, and the controlled power supply circuit is turned on. The microcontroller unit can send a control signal CTRL to the controlled terminal of the controlled power supply circuit. When CTRL is at a high level, the controlled power supply circuit is not turned on.

[0039] The capacitance of the first capacitor C1 can be 10uF, the capacitance of the second capacitor C2 can be 1uF, the capacitance of the third capacitor C3 can be 100nF, the resistance of the first resistor R1 can be 100KΩ, the resistance of the second resistor R2 can be 1KΩ, and the resistance of the third resistor R3 can be 100KΩ.

[0040] The first MOS transistor Q1 used in this embodiment of the present invention can be a PMOS transistor.

[0041] like Figure 3As shown, based on the above embodiment, the charging circuit includes a second MOSFET Q3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a second transistor Q4, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The voltage input terminal of the charging circuit is grounded through the fourth capacitor C4; The voltage output terminal of the charging circuit is grounded through the fifth capacitor C5; The drain of the second MOSFET Q3 is connected to the voltage input terminal of the charging circuit; The drain of the second MOSFET Q3 is connected to the gate of the second MOSFET Q3 through the sixth capacitor C6 and the fourth resistor R4, respectively. The controlled terminal of the charging circuit is connected to the base of the second transistor Q4 through the fifth resistor R5. The collector of the second transistor Q4 is connected to the gate of the second MOSFET Q3 through the sixth resistor R6. The base of the second transistor Q4 is connected to the emitter of the second transistor Q4 through the seventh resistor R7. The emitter of the second transistor Q4 is grounded.

[0042] The second MOS transistor Q2 used in this embodiment of the present invention can be a PMOS transistor.

[0043] Figure 3 In the circuit, the voltage at the input terminal of the charging circuit is VBUS2, and VBUS2 > VBUS1. The voltage at the output terminal of the charging circuit is the supply voltage VOUT.

[0044] The controlled terminal of the charging circuit is at a low level by default, and the charging circuit is not conducting. The microcontroller unit can send a control signal VEN to the controlled terminal of the charging circuit. When VEN is high, the charging circuit conducts. It is understandable that charging circuits based on different charging principles can have the same or different structures.

[0045] Among them, the capacitance value of the fourth capacitor C4 can be 10uF, the capacitance value of the fifth capacitor C5 can be 1uF, the capacitance value of the sixth capacitor C6 can be 100nF, the resistance value of the fourth resistor R4 can be 100KΩ, the resistance value of the fifth resistor R5 can be 1KΩ, the resistance value of the sixth resistor R6 can be 100KΩ, and the resistance value of the seventh resistor R7 can be 10KΩ.

[0046] like Figure 4 As shown, based on the above embodiment, the power supply path includes the third MOSFET Q5 and the eighth resistor R8; The drain of the third MOSFET Q5 is connected to the output terminal OUT of the DC-DC converter U1; The controlled terminal of the power supply path is connected to the gate of the third MOSFET Q5, and is connected to the drain of the third MOSFET Q5 through the eighth resistor R8. The source of the third MOSFET Q5 is connected to the main control system.

[0047] The third MOS transistor Q3 used in this embodiment of the present invention can be a PMOS transistor.

[0048] Figure 4 In this circuit, the input terminal IN of the DC-DC converter U1 is connected to the battery VBAT or the power supply voltage VOUT provided by the charging circuit, and the ground terminal GND of the DC-DC converter U1 is grounded.

[0049] The output voltage OUT of the DC-DC converter U1 is VDD, which is the voltage at the input terminal of the power supply path. The output voltage of the power supply path is the output voltage Vsystem of the voltage stabilization circuit. The controlled terminal of the power supply path is low by default, and the power supply path is on. The microcontroller unit can send a control signal EN1 to the controlled terminal of the power supply path. When EN1 is high, the power supply path is not on. The resistance value of the eighth resistor R8 can be 100KΩ.

[0050] like Figure 4 As shown, based on the above embodiment, the pre-charge path also includes a fourth MOS transistor Q6 and a ninth resistor R9; The current-limiting resistor R0 is connected between the output terminal OUT of the DC-DC converter U1 and the drain of the fourth MOSFET Q6; The controlled terminal of the pre-charge path is connected to the gate of the fourth MOSFET Q6, and is connected to the drain of the fourth MOSFET Q6 through the ninth resistor R9; The source of the fourth MOSFET Q6 is connected to the main control system.

[0051] The fourth MOS transistor Q6 used in this embodiment of the present invention can be a PMOS transistor.

[0052] Figure 4 In this circuit, the voltage input of the pre-charge path is also VDD, and the voltage output of the pre-charge path is also Vsystem. The controlled terminal of the pre-charge path is high by default, and the pre-charge path is not conducting. The microcontroller unit can send a control signal EN2 to the controlled terminal of the pre-charge path. When EN2 is low, the pre-charge path is conducting. The resistance value of the ninth resistor R9 can be 100KΩ.

[0053] Based on the above embodiments, such as Figure 4 As shown, the voltage stabilizing circuit also includes a seventh capacitor C7, and the voltage output terminal of the voltage stabilizing circuit is grounded through the seventh capacitor C7. The capacitance value of the seventh capacitor C7 can be 1uF.

[0054] Based on the above embodiments, the charging circuit includes multiple components; The multi-power stable power supply circuit also includes a sampling circuit corresponding to each of the charging circuits; Each of the aforementioned sampling circuits is connected to the microcontroller unit; Each of the sampling circuits is used to sample the input voltage of the corresponding charging circuit to obtain a sampling result; The microcontroller unit is also configured to determine the switching trigger event corresponding to each of the sampling results.

[0055] Specifically, the charging circuit may include at least one of wired charging circuit and wireless charging circuit, or other types of charging circuit, without being specifically limited here.

[0056] The multi-power stable power supply circuit also includes a sampling circuit for each charging circuit.

[0057] Each sampling circuit's input is connected to the corresponding charging circuit's input, and each sampling circuit's output is connected to the microcontroller unit. Each sampling circuit can sample the input voltage of its corresponding charging circuit to obtain the sampling result.

[0058] Furthermore, the microcontroller unit can determine the switching trigger event corresponding to each sampling result based on the sampling result of each sampling circuit, that is, determine whether the power supply has switched and whether there is a charging circuit corresponding to the sampling circuit to replace the battery for power supply.

[0059] When a wired USB charging cable is plugged in, the microcontroller unit detects the sampled input voltage of the wired charging circuit after voltage division via the sampling circuit corresponding to the wired charging circuit. At this time, the microcontroller unit controls the controlled terminal of the wired charging circuit to change from low to high, turning on the wired charging circuit. The controlled terminal of the wireless charging circuit remains low, while the controlled terminal of the controlled power supply circuit changes from low to high, turning off the controlled power supply circuit, and the main control system is powered through the wired charging circuit.

[0060] During wireless charging, the microcontroller unit detects the voltage drop across the wireless charging circuit through a sampling circuit. The microcontroller then controls the controlled terminal of the wireless charging circuit to remain high, thus turning on the wireless charging circuit. Meanwhile, the controlled terminal of the wired charging circuit remains low, and the controlled terminal of the controlled power supply circuit changes from low to high, turning off the controlled power supply circuit. The main control system then receives power from the wireless charging circuit.

[0061] When not charging, the controlled terminals of each charging circuit are at a low level by default and are not conducting. The controlled terminals of the controlled power supply circuit are at a high level by default and are conducting, so the battery supplies power to the main control system.

[0062] like Figure 5As shown, based on the above embodiments, this utility model also provides an electronic device, including a main control system 51 and a multi-power stable power supply circuit 52 provided in the above embodiments.

[0063] By introducing a multi-power supply stabilization circuit into electronic devices, voltage drops during initial power-on can be avoided, preventing system restarts. It also effectively suppresses inrush currents during power switching, protecting components such as MOSFETs in the main control system and preventing voltage drops in the voltage stabilization circuit's output. Furthermore, it enables flexible timing management and state switching.

[0064] Based on the above embodiments, the electronic devices in the embodiments of this utility model may include intelligent robots such as sweeping robots and industrial robots.

[0065] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0066] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-power source stable power supply circuit, characterized in that, include: Microcontroller unit, battery power supply circuit, charging circuit and voltage stabilization circuit; The battery power supply circuit includes a battery, a controlled power supply circuit, and a unidirectional freewheeling element; the voltage stabilization circuit includes a DC-DC converter, a power supply path, and a pre-charge path; the pre-charge path includes a current-limiting resistor. The battery is connected to the positive terminal of the unidirectional freewheeling element and the voltage input terminal of the controlled power supply circuit, respectively. The negative terminal of the unidirectional freewheeling element is connected to the voltage output terminal of the controlled power supply circuit. The voltage output terminal of the controlled power supply circuit and the charging circuit are both connected to the input terminal of the DC-DC converter. The output terminal of the DC-DC converter is connected to the power supply path and the pre-charge path, respectively, and the power supply path and the pre-charge path are connected to the main control system, respectively. The microcontroller unit is connected to the controlled power supply circuit, the charging circuit, the voltage stabilization circuit, the power supply path, and the controlled end of the pre-charging path, respectively. The microcontroller unit is configured to switch the conduction state of the controlled power supply circuit and the charging circuit, and to switch the conduction state of the power supply path and the pre-charging path.

2. The multi-power supply stable power supply circuit according to claim 1, characterized in that, The controlled power supply circuit includes a first MOSFET, a first capacitor, a second capacitor, a third capacitor, a first transistor, a first resistor, a second resistor, and a third resistor; The voltage input terminal of the controlled power supply circuit is grounded through the first capacitor; The voltage output terminal of the controlled power supply circuit is grounded through the second capacitor; The drain of the first MOSFET is connected to the voltage input terminal of the controlled power supply circuit; The drain of the first MOS transistor is connected to the gate of the first MOS transistor through the third capacitor and the first resistor; The controlled terminal of the controlled power supply circuit is connected to the base of the first transistor through the second resistor, the emitter of the first transistor is connected to the voltage input terminal of the controlled power supply circuit, and the collector of the first transistor is grounded through the third resistor and connected between the third capacitor and the first resistor.

3. The multi-power supply stable power supply circuit according to claim 1, characterized in that, The charging circuit includes a second MOSFET, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second transistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; The voltage input terminal of the charging circuit is grounded through the fourth capacitor; The voltage output terminal of the charging circuit is grounded through the fifth capacitor; The drain of the second MOSFET is connected to the voltage input terminal of the charging circuit; The drain of the second MOS transistor is connected to the gate of the second MOS transistor through the sixth capacitor and the fourth resistor, respectively; The controlled terminal of the charging circuit is connected to the base of the second transistor through the fifth resistor, the collector of the second transistor is connected to the gate of the second MOS transistor through the sixth resistor, the base of the second transistor is connected to the emitter of the second transistor through the seventh resistor, and the emitter of the second transistor is grounded.

4. The multi-power supply stable power supply circuit according to claim 1, characterized in that, The power supply path includes a third MOSFET and an eighth resistor; The drain of the third MOS transistor is connected to the output terminal of the DC-DC converter; The controlled terminal of the power supply path is connected to the gate of the third MOS transistor and to the drain of the third MOS transistor through the eighth resistor. The source of the third MOS transistor is connected to the main control system.

5. The multi-power supply stable power supply circuit according to claim 1, characterized in that, The pre-charge path also includes a fourth MOSFET and a ninth resistor; The current-limiting resistor is connected between the output terminal of the DC-DC converter and the drain of the fourth MOS transistor; The controlled terminal of the pre-charge path is connected to the gate of the fourth MOS transistor and to the drain of the fourth MOS transistor through the ninth resistor; The source of the fourth MOS transistor is connected to the main control system.

6. The multi-power source stable power supply circuit according to any one of claims 1-5, characterized in that, The charging circuit includes multiple components; The multi-power stable power supply circuit also includes a sampling circuit corresponding to each of the charging circuits; Each of the aforementioned sampling circuits is connected to the microcontroller unit; Each of the sampling circuits is used to sample the input voltage of the corresponding charging circuit to obtain a sampling result; The microcontroller unit is also configured to determine the switching trigger event corresponding to each of the sampling results.

7. The multi-power source stable power supply circuit according to any one of claims 1-5, characterized in that, The voltage stabilizing circuit also includes a seventh capacitor; The voltage output terminal of the voltage stabilization circuit is grounded through the seventh capacitor.

8. The multi-power source stable power supply circuit according to any one of claims 1-5, characterized in that, The unidirectional freewheeling element is a Schottky diode.

9. An electronic device, characterized in that, include: The main control system and the multi-power stable power supply circuit as described in any one of claims 1-8.

10. The electronic device according to claim 9, characterized in that, The electronic device includes an intelligent robot.

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