A multi-power-source-based adaptive power switching control system and device

Abstract

The application provides a multi-power-source-based adaptive power switching control system and device, wherein the multi-power-source-based adaptive power switching control system comprises a power switching control circuit, an external power supply circuit, an internal power supply circuit, a first controlled switch and a three-terminal voltage stabilizing circuit corresponding to the external power supply circuit one by one, the reference end of each three-terminal voltage stabilizing circuit is connected with the input end of the external power supply circuit, the input end is connected with the input end of the external power supply circuit, and the output end is connected with the control end of the first controlled switch; the first end of the first controlled switch is connected with the input end of the external power supply circuit, and the second end is connected with the control end of the external power supply circuit and the power switching circuit respectively; and the output end of the three-terminal voltage stabilizing circuit outputs a high / low level signal according to the relationship between the voltage connected with the reference end and the corresponding preset reference voltage. The application avoids the machine shutdown caused by long power-off time, greatly shortens the voltage switching time, and realizes the instant switching of the charging voltage.

Description

Technical Field

[0001] This invention relates to the field of circuit control, and more specifically to an adaptive power switching control system and device based on multiple power sources. Background Technology

[0002] To meet users' needs for convenient use of portable devices at different times and in different scenarios, most portable devices on the market are equipped with a rechargeable power module. In indoor environments with external power sources, users can charge the device using an external power source. In outdoor environments without external power sources, users can charge the device using its internal rechargeable power module, ensuring extended operation. However, while existing technologies allow the use of power banks, computers, and other devices as external power sources to charge portable devices, the large electrolytic capacitors in the external adapters can cause voltage switching issues when switching from external power to the internal rechargeable power module. This can lead to device shutdown and disruption to user experience. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the large electrolytic capacitor in the external adapter of portable devices causes the whole system voltage to be unable to switch quickly, ultimately resulting in the shutdown of the whole device, so as to provide an adaptive power switching control system and device based on multiple power supplies.

[0004] According to a first aspect, embodiments of the present invention provide an adaptive power switching control system based on multiple power supplies, comprising: a power switching control circuit and an external power supply circuit and an internal power supply circuit respectively connected to the power supply terminal of a target device, wherein the power switching control circuit is used to switch between the external power supply circuit and the internal power supply circuit to supply power to the target device, and the system further comprising: a first controlled switch and a three-terminal voltage regulator circuit corresponding one-to-one with the external power supply with different supply voltages, wherein...

[0005] The reference terminal of each three-terminal voltage regulator circuit is connected to the input terminal of the external power supply circuit, the input terminal is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the control terminal of the first controlled switch.

[0006] The first terminal of the first controlled switch is connected to the input terminal of the external power supply circuit, and the second terminal is connected to the control terminal of the external power supply circuit and the control terminal of the power switching circuit, respectively.

[0007] The output of each three-terminal voltage regulator circuit outputs a high / low level signal based on the relationship between the voltage connected to its reference terminal and its corresponding preset reference voltage, in order to control the first controlled switch to be turned on or off, thereby realizing the switching between the external power supply circuit and the internal power supply circuit. The preset reference voltage corresponding to each three-terminal voltage regulator circuit is less than or equal to the supply voltage of its corresponding external power supply.

[0008] Optionally, each three-terminal voltage regulator circuit determines its control priority according to the supply voltage of its corresponding external power supply from large to small.

[0009] A delay control circuit is provided between the three-terminal voltage regulator circuit with high control priority and all three-terminal voltage regulator circuits with lower control priority.

[0010] The control terminal of the delay control circuit is connected to the output terminal of the three-terminal voltage regulator circuit with high control priority, the input terminal is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the three-terminal voltage regulator circuit with low control priority. It is used to maintain the output of the three-terminal voltage regulator circuit with low control priority for a certain period of time when the output terminal of the three-terminal voltage regulator circuit with high control priority outputs a low-level signal.

[0011] Optionally, the delay control circuit includes: an RC circuit, an RC control circuit, and a second controlled switch, wherein,

[0012] The control terminal of the second controlled switch is connected to the output terminal of the RC circuit, the first terminal is connected to the ground terminal of the three-terminal voltage regulator circuit with low priority, and the second terminal is grounded.

[0013] The control terminal of the RC control circuit is connected to the output terminal of the three-terminal voltage regulator circuit with high control priority, the input terminal is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the RC circuit. It is used to control the RC circuit to charge when the output terminal of the three-terminal voltage regulator circuit with high control priority outputs a low-level signal, so as to delay the second controlled switch from turning on.

[0014] Optionally, the RC circuit includes: a fourth resistor and a first capacitor, wherein,

[0015] One end of the fourth resistor is connected to the input terminal of the external power supply circuit, and the other end is connected to the output terminal of the RC control circuit, one end of the first capacitor, and the control terminal of the second controlled switch.

[0016] The other end of the first capacitor is grounded.

[0017] Optionally, the RC control circuit includes: a third controlled switch and a fourth controlled switch, wherein,

[0018] The control terminal of the third controlled switch is connected to the output terminal of the three-terminal voltage regulator circuit with a higher control priority, the first terminal is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the control terminal of the fourth controlled switch.

[0019] The first terminal of the fourth controlled switch is connected to the other terminal of the fourth resistor, and the second terminal is grounded.

[0020] Optionally, the three-terminal voltage regulator circuit includes: a three-terminal adjustable shunt parallel voltage regulator and a voltage divider circuit, wherein,

[0021] The input terminal of the voltage divider circuit is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the reference terminal of the three-terminal adjustable shunt parallel voltage regulator. The input terminal of the three-terminal adjustable shunt parallel voltage regulator is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the control terminal of the first controlled switch.

[0022] When the reference voltage of the three-terminal adjustable shunt parallel regulator is less than the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator, the output terminal of the three-terminal adjustable shunt parallel regulator outputs a high-level signal.

[0023] When the reference terminal voltage of the three-terminal adjustable shunt parallel regulator is not less than the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator, the output terminal of the three-terminal adjustable shunt parallel regulator outputs a low-level signal.

[0024] Optionally, the three-terminal voltage regulator circuit further includes:

[0025] A diode, wherein the anode of the diode is connected to the control terminal of the first controlled switch, and the cathode is connected to the output terminal of the three-terminal adjustable shunt parallel voltage regulator;

[0026] The first resistor has one end connected to the input terminal of the external power supply circuit and the other end connected to the input terminal of the three-terminal adjustable shunt parallel voltage regulator.

[0027] Optionally, the system further includes: a second resistor and a third resistor, wherein,

[0028] One end of the second resistor is connected to the output terminal of the three-terminal adjustable shunt parallel voltage regulator, and the other end is connected to one end of the third resistor and the control terminal of the first controlled switch, respectively.

[0029] The other end of the third resistor is connected to the input terminal of the external power supply circuit.

[0030] Optionally, the power control switching circuit includes: a fifth controlled switch, the control terminal of the fifth controlled switch being connected to the second terminal of the first controlled switch, the first terminal being connected to the control terminal of the internal power supply circuit, and the second terminal being grounded.

[0031] According to a second aspect, embodiments of the present invention provide an adaptive power switching control device based on multiple power sources, the device comprising: an adaptive power switching control system based on multiple power sources as described in the first aspect, or any optional embodiment of the first aspect.

[0032] The technical solution of this invention has the following advantages:

[0033] 1. The adaptive power switching control system based on multiple power sources provided by this invention includes a power switching control circuit for switching between external power supply circuits and internal power supply circuits to power the target device. By setting a first controlled switch and a three-terminal voltage regulator circuit corresponding one-to-one with external power supplies with different supply voltages, it ensures that the target device can be powered by any external power supply while also switching from external power supply circuit mode to internal power supply circuit mode. This greatly improves charging flexibility. It avoids the long power outage time caused by large electrolytic capacitors in the target device's external adapter, which could lead to the entire machine stopping, and significantly shortens the voltage switching time, achieving instant switching of charging voltage, thereby bringing a better user experience.

[0034] 2. The adaptive power switching control system based on multiple power sources provided by this invention ensures the sequential control switching by setting the control priority of each three-terminal voltage regulator circuit, avoiding the danger of short circuits in the target equipment caused by multiple three-terminal voltage regulator circuits being switched simultaneously; by setting a delay control circuit, the three-terminal voltage regulator circuit with lower control priority is maintained to output a high-level signal for a certain period of time, ensuring that only one three-terminal voltage regulator circuit outputs a low-level signal, thereby achieving the operational stability of the adaptive power switching control system based on multiple power sources.

[0035] 3. The adaptive power switching control system based on multiple power sources provided by this invention includes an RC circuit, an RC control circuit, and a second controlled switch. Through the coordinated operation of the RC circuit, the RC control circuit, and the second controlled switch, the RC control circuit controls the RC circuit to charge when the output terminal of the high-priority three-terminal voltage regulator outputs a low-level signal, thereby delaying the conduction of the second controlled switch. This avoids the low-priority three-terminal voltage regulator generating erroneous interference signals that cause the first controlled switch to frequently turn on and off, affecting the normal switching of the power supply circuit. This further improves the accuracy of circuit switching when the external power supply circuit is powered off, ensuring the stability of the equipment power supply.

[0036] 4. The adaptive power switching control system based on multiple power sources provided by the present invention includes an RC circuit comprising a fourth resistor and a first capacitor. By controlling the charging time of the first capacitor, the conduction time of the second controlled switch is delayed, thereby further enhancing the flexibility of the adaptive power switching control and meeting user needs.

[0037] 5. The adaptive power switching control system based on multiple power sources provided by the present invention includes an RC control circuit comprising a third controlled switch and a fourth controlled switch. The third and fourth controlled switches cooperate with each other to effectively connect the external power supply circuit with the RC circuit, thereby laying the foundation for a stable and rapid switch from the external power supply circuit to the internal power supply circuit to power the target device, avoiding the shutdown of the whole machine due to long power outage time, and greatly improving the power switching efficiency.

[0038] 6. The adaptive power switching control system based on multiple power sources provided by this invention includes a three-terminal voltage regulator circuit comprising: a three-terminal adjustable shunt parallel regulator and a voltage divider circuit. By fully utilizing the operating characteristics of the three-terminal adjustable shunt parallel regulator, and based on the relationship between its reference terminal voltage and the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator, a high / low level signal is output to control the conduction or disconnection of the first controlled switch, thereby realizing the switching between the external power supply circuit and the internal power supply circuit. By setting the voltage divider circuit, the stable operation of the three-terminal adjustable shunt parallel regulator is ensured, thereby ensuring the efficient and stable operation of the adaptive power switching control system based on multiple power sources.

[0039] 7. The adaptive power switching control system based on multiple power supplies provided by the present invention further includes a three-terminal voltage regulator circuit: a diode and a first resistor. By setting the diode, mutual interference between external power supplies with different supply voltages is avoided. By cooperating with the first resistor, the system can quickly switch from external power supply circuit to internal power supply circuit while isolating each external power supply circuit from each other, thereby further ensuring the smooth operation of the switching control process.

[0040] 8. The adaptive power switching control system based on multiple power sources provided by the present invention, by setting a second resistor and a third resistor, not only effectively ensures the stable operation of each three-terminal voltage regulator circuit, but also assists the first controlled switch and power switching control circuit to achieve flexible switching from the external power supply circuit to the internal power supply circuit, thereby avoiding the situation where the target equipment stops due to excessive power outage time, and greatly improving user satisfaction.

[0041] 9. The adaptive power switching control system based on multiple power sources provided by the present invention switches between the external power supply circuit and the internal power supply circuit through the fifth controlled switch, ensuring normal use of the target equipment by the user, avoiding mid-term shutdown of the target equipment, and greatly improving user satisfaction.

[0042] 10. The adaptive power switching control device based on multiple power sources provided by the present invention, by setting up an adaptive power switching control system based on multiple power sources as described in another embodiment of the present invention, ensures that the target device can be powered by any external power source, and can also be powered by the internal power supply circuit while switching from the external power supply circuit mode to the internal power supply circuit. The charging flexibility is greatly improved. While avoiding the long power outage time caused by the presence of large electrolytic capacitors in the external adapter of the target device, which could lead to the shutdown of the whole machine, the voltage switching time is greatly shortened, realizing the instantaneous switching of charging voltage, thereby bringing a better user experience. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the switching circuit in the prior art according to an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the structure of an adaptive power switching control system based on multiple power sources according to an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the three-terminal voltage regulator circuit according to an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the adaptive power switching control system based on dual power supplies according to an embodiment of the present invention.

[0048] Figure 5 This is a schematic diagram of the structure of an adaptive power switching control system based on three power supplies according to an embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of the structure of an adaptive power switching control device based on multiple power sources according to an embodiment of the present invention. Detailed Implementation

[0050] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Existing power switching control circuits, such as Figure 1 As shown, conventional power switching control circuits do not consider the presence of large electrolytic capacitors in external adapters. This makes it impossible to quickly switch charging power in portable devices with internal charging circuits in the event of a power outage. Consequently, users may encounter situations where the portable device stops mid-use and needs to be restarted, resulting in a poor user experience. Furthermore, due to the continuous upgrading of various charging devices, the voltages they provide are not always the same. How to flexibly switch from external power to internal power supply based on the voltage of the external power supply circuit has become an urgent problem to be solved. Based on this, this invention provides an adaptive power switching control system and device based on multiple power supplies. By improving the pure hardware circuit, it not only reduces the control of the main control MCU, but also further enhances the flexibility of circuit switching control, speeds up hardware response, and avoids power outages of the entire device.

[0055] Example 1

[0056] like Figure 2As shown, this embodiment of the invention provides an adaptive power switching control system based on multiple power supplies, including: a power switching control circuit 10 and an external power supply circuit 20 and an internal power supply circuit 30 respectively connected to the power supply terminal of a target device. The power switching control circuit 10 is used to switch between the external power supply circuit 20 and the internal power supply circuit 30 to supply power to the target device. The system also includes: a first controlled switch Q7 and a three-terminal voltage regulator circuit 60 corresponding one-to-one with the external power supply with different supply voltages, such as... Figure 2 The illustration shows three three-terminal voltage regulator circuits 60 corresponding to three external power supplies with different supply voltages. ON-1, ON-2, and ON-3 are the output pins of the three three-terminal voltage regulator circuits 60, respectively. In practical applications, the number of three-terminal voltage regulator circuits 60 can be flexibly adjusted according to the actual supply voltage of the external power supply. For example, two or more three-terminal voltage regulator circuits 60 can be set. This invention is not limited to this.

[0057] For example, Figure 2 The circuit structure of the three-terminal voltage regulator circuit 60 corresponding to ON-1 is as follows: Figure 3 As shown, where,

[0058] The reference terminal of the three-terminal voltage regulator circuit 60 is connected to the input terminal of the external power supply circuit 20, the input terminal is connected to the input terminal of the external power supply circuit 20, and the output terminal is connected to the control terminal of the first controlled switch Q7.

[0059] The first terminal of the first controlled switch Q7 is connected to the input terminal of the external power supply circuit 20, and the second terminal is connected to the control terminal of the external power supply circuit 20 and the control terminal of the power switching circuit, respectively.

[0060] The output of the three-terminal voltage regulator circuit 60 outputs a high / low level signal based on the relationship between its reference terminal voltage and its corresponding preset reference voltage. This controls the first controlled switch Q7 to turn on or off, thereby switching between the external power supply circuit 20 and the internal power supply circuit 30. The preset reference voltage corresponding to the three-terminal voltage regulator circuit 60 is less than or equal to the supply voltage of its corresponding external power supply. The structure of the three-terminal voltage regulator circuit 60 corresponding to ON-1 and ON-2 is similar to... Figure 3 The three-terminal voltage regulator circuit 60 shown is similar and will not be described in detail here.

[0061] As one implementation of this embodiment, the first controlled switch Q7 can be a PNP transistor, but the actual situation is not limited to this. The selection and quantity of the first controlled switch Q7 can be changed according to actual needs.

[0062] Specifically, such as Figure 2As shown, V_IN represents the power supply voltage of the external power supply circuit 20, VBAT represents the power supply voltage of the internal power supply circuit 30, and VCC represents the power supply voltage of the entire system. The external power supply circuit 20 is equipped with U1 / U2 switching transistors; the internal power supply circuit 30 is equipped with U3 / U4 switching transistors. By turning on and off the U1 / U2 / U3 / U4 switching transistors, VCC is switched to V_IN or VBAT, thereby realizing the switching between the external power supply circuit 20 and the internal power supply circuit 30.

[0063] Specifically, in practical applications, the preset reference voltage corresponding to the three-terminal voltage regulator circuit 60 is used to determine whether an external power supply failure has occurred, and to perform the action of switching from external power supply to internal power supply. When the power supply voltage is less than the preset reference voltage, it is considered that the external power supply circuit 20 has failed. The closer the value is to the power supply voltage of the external power supply circuit 20, the faster the power supply circuit switching speed will be, and the corresponding anti-interference capability will be reduced. Therefore, each preset reference voltage can be flexibly set according to the stability of the power supply voltage of the external power supply circuit 20 and the requirements of the power supply circuit switching speed. This invention is not limited thereto.

[0064] The adaptive power switching control system based on multiple power supplies provided in this embodiment of the invention includes a power switching control circuit 10 for switching between external power supply circuit 20 and internal power supply circuit 30 to power the target device. By setting a first controlled switch Q7 and a three-terminal voltage regulator circuit 60 corresponding one-to-one with external power supplies with different supply voltages, the system ensures that the target device can be powered by any external power supply while also being powered by the internal power supply circuit 30 instead of the external power supply circuit 20. This significantly improves charging flexibility, avoids long power outage times caused by large electrolytic capacitors in the target device's external adapter, and greatly shortens the voltage switching time, enabling instantaneous switching of charging voltage and providing users with a better user experience.

[0065] Specifically, in one embodiment, combined with Figures 3-5 As shown, the three-terminal voltage regulator circuit 60 determines the control priority according to the supply voltage of its corresponding external power supply from large to small.

[0066] A delay control circuit 50 is provided between the three-terminal voltage regulator circuit 60 with high control priority and all three-terminal voltage regulator circuits 60 with lower control priority.

[0067] The control terminal of the delay control circuit 50 is connected to the output terminal of the three-terminal voltage regulator circuit 60 with high control priority, the input terminal is connected to the input terminal of the external power supply circuit 20, and the output terminal is connected to the three-terminal voltage regulator circuit 60 with low control priority. It is used to maintain the output of the three-terminal voltage regulator circuit 60 with low control priority for a certain period of time when the output terminal of the three-terminal voltage regulator circuit 60 with high control priority outputs a low-level signal.

[0068] The adaptive power switching control system based on multiple power sources provided in this embodiment of the invention ensures the sequential control switching by setting the control priority of the three-terminal voltage regulator circuit 60, avoiding the risk of short circuits in the target equipment caused by multiple three-terminal voltage regulator circuits 60 being switched simultaneously; by setting a delay control circuit 50, the three-terminal voltage regulator circuit 60 with lower control priority is maintained to output a high-level signal for a certain period of time, ensuring that only one three-terminal voltage regulator circuit 60 outputs a low-level signal, thereby achieving the operational stability of the adaptive power switching control system based on multiple power sources.

[0069] Specifically, in one embodiment, such as Figure 4 As shown, the delay control circuit 50 includes: an RC circuit, an RC control circuit, and a second controlled switch Q12, wherein,

[0070] The control terminal of the second controlled switch Q12 is connected to the output terminal of the RC circuit, the first terminal is connected to the ground terminal of the low-priority three-terminal voltage regulator circuit 60, and the second terminal is grounded.

[0071] The control terminal of the RC control circuit is connected to the output terminal of the high-priority three-terminal voltage regulator circuit 60, the input terminal is connected to the input terminal of the external power supply circuit 20, and the output terminal is connected to the RC circuit. It is used to control the RC circuit to charge when the output terminal of the high-priority three-terminal voltage regulator circuit 60 outputs a low-level signal, so as to delay the second controlled switch Q12 from turning on.

[0072] The present invention uses a three-terminal voltage regulator circuit 60 with a three-level structure as an example for illustration, but the actual situation is not limited to this. The number and structure of control levels can be flexibly adjusted according to actual needs.

[0073] Specifically, in one embodiment, such as Figure 4 As shown, the RC circuit includes: a fourth resistor R18 and a first capacitor C20, wherein,

[0074] One end of the fourth resistor R18 is connected to the input terminal of the external power supply circuit 20, and the other end is connected to the output terminal of the RC control circuit, one end of the first capacitor C20, and the control terminal of the second controlled switch Q12.

[0075] The other end of the first capacitor C20 is grounded.

[0076] The adaptive power switching control system based on multiple power sources provided in this embodiment of the invention includes an RC circuit comprising a fourth resistor R18 and a first capacitor C20. By controlling the charging time of the first capacitor C20, the conduction time of the second controlled switch Q12 is delayed, thereby further enhancing the flexibility of the adaptive power switching control and meeting user needs.

[0077] Specifically, in one embodiment, such as Figure 4 As shown, the RC control circuit includes: a third controlled switch Q13 and a fourth controlled switch Q14, wherein,

[0078] The control terminal of the third controlled switch Q13 is connected to the output terminal of the three-terminal voltage regulator circuit 60 with a higher control priority, the first terminal is connected to the input terminal of the external power supply circuit 20, and the output terminal is connected to the control terminal of the fourth controlled switch Q14.

[0079] The first terminal of the fourth controlled switch Q14 is connected to the other terminal of the fourth resistor R18, and the second terminal is grounded.

[0080] The adaptive power switching control system based on multiple power sources provided in this embodiment of the invention includes an RC control circuit comprising a third controlled switch Q13 and a fourth controlled switch Q14. The third controlled switch Q13 and the fourth controlled switch Q14 cooperate with each other to effectively connect the external power supply circuit 20 to the RC circuit, thereby laying the foundation for a stable and rapid switch from the external power supply circuit 20 to the internal power supply circuit 30 to power the target device, avoiding shutdown due to long power outage time, and significantly improving power switching efficiency.

[0081] like Figure 4 As shown in the embodiment of the present invention, taking the control priority of the three-terminal voltage regulator circuit 60 corresponding to ON-1 as the highest level, the control priorities of the three-terminal voltage regulator circuits 60 corresponding to ON-2 and ON-3 decrease sequentially. However, the actual situation is not limited to this, and the number and order of control priorities can be changed according to actual needs.

[0082] For example, assuming the input voltages V_IN are 12V, 9V, and 5V respectively, the reference voltages of the three-terminal voltage regulator circuits 60 corresponding to ON-1, ON-2, and ON-3 are 11V, 8V, and 5V respectively. Taking the delay control circuit 50 between the first-stage three-terminal voltage regulator circuit corresponding to ON-1 and the second-stage three-terminal voltage regulator circuit corresponding to ON-2 as an example, this delay control circuit 50 is composed of an RC circuit consisting of a fourth resistor R18 and a first capacitor C20, an RC control circuit consisting of a third controlled switch Q13 and a fourth controlled switch Q14, and a second controlled switch Q12. The delay control circuit 50 also includes multiple resistors for voltage division or current limiting, with the specific connections as follows: Figure 4 As shown, it will not be described again here. The connection relationship of the delay control circuit 50 between the second-stage three-terminal voltage regulator circuit corresponding to ON-2 and the third-stage three-terminal voltage regulator circuit corresponding to ON-3 is similar to the connection relationship of the delay control circuit 50 between the first-stage three-terminal voltage regulator circuit corresponding to ON-1 and the second-stage three-terminal voltage regulator circuit corresponding to ON-2, and will not be described again here.

[0083] It should be noted that the second controlled switch Q12, the third controlled switch Q13, and the fourth controlled switch Q14 can be transistors. Their selection and setting methods can refer to the relevant descriptions in the prior art, and will not be repeated here. The selection and setting methods of the resistors in the delay control circuit 50 can also refer to the relevant descriptions in the prior art, and will not be repeated here.

[0084] Taking the high-level output of ON-1 as an example, the delay control circuit 50 realizes the delay control of the first-stage three-terminal voltage regulator circuit corresponding to ON-1 and the second-stage three-terminal voltage regulator circuit corresponding to ON-2, thereby ensuring that when the first-stage three-terminal voltage regulator circuit outputs a low-level signal, the second-stage three-terminal voltage regulator circuit and the third-stage three-terminal voltage regulator circuit output a high-level signal, ensuring that only one three-terminal voltage regulator circuit 60 is turned on.

[0085] The adaptive power switching control system based on multiple power sources provided in this embodiment of the invention includes a delay control circuit 50 comprising an RC circuit, an RC control circuit, and a second controlled switch Q12. Through the coordinated operation of the RC circuit, the RC control circuit, and the second controlled switch Q12, the RC control circuit controls the RC circuit to charge when the output terminal of the high-priority three-terminal voltage regulator 60 outputs a low-level signal, thus delaying the conduction of the second controlled switch Q12. This avoids the low-priority three-terminal voltage regulator generating erroneous interference signals that cause the first controlled switch to frequently turn on and off, affecting the normal switching of the power supply circuit. Furthermore, this improves the accuracy of circuit switching when the external power supply circuit is powered off, ensuring the stability of the equipment's power supply.

[0086] Specifically, in one embodiment, such as Figure 3As shown, the three-terminal voltage regulator circuit 60 includes: a three-terminal adjustable shunt parallel voltage regulator U5 and a voltage divider circuit, wherein,

[0087] The input terminal of the voltage divider circuit is connected to the input terminal of the external power supply circuit 20, and the output terminal is connected to the reference terminal of the three-terminal adjustable shunt parallel regulator U5. The input terminal of the three-terminal adjustable shunt parallel regulator U5 is connected to the input terminal of the external power supply circuit 20, and the output terminal is connected to the control terminal of the first controlled switch Q7.

[0088] When the reference terminal voltage of the three-terminal adjustable shunt parallel regulator U5 is less than the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator U5, the output terminal of the three-terminal adjustable shunt parallel regulator U5 outputs a high-level signal.

[0089] When the reference terminal voltage of the three-terminal adjustable shunt parallel regulator U5 is not less than the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator U5, the output terminal of the three-terminal adjustable shunt parallel regulator U5 outputs a low-level signal.

[0090] Specifically, the voltage divider circuit consists of voltage divider resistors R10 and R11, and voltage division is achieved by setting R10 and R11. As one implementation of this embodiment, the three-terminal adjustable shunt parallel regulator U5 is a TL431. By utilizing the TL431 chip's fixed threshold voltage of 2.5V, the power-down time of the V_IN voltage is segmented, reducing interference caused by power-down time and enabling rapid switching from external power supply to internal power supply, thus preventing power loss of the entire machine load.

[0091] like Figure 3 As shown, under normal power supply conditions, the voltage at point a is greater than 2.5V. When a power failure occurs, when the V_IN voltage drops to the preset reference voltage (i.e., threshold voltage), the voltage at point a drops to 2.5V. When the V_IN voltage is less than the threshold voltage, the voltage at point a is less than 2.5V, the TL431 stops working, and the ON-1 output level becomes high, thus completing the circuit switching, that is, switching from external power supply circuit to internal power supply circuit.

[0092] It should be noted that the reference voltage of the three-terminal adjustable shunt parallel regulator U5 mentioned above is a fixed 2.5V. In this embodiment of the invention, by utilizing the operating characteristics of TL431, when its reference terminal voltage is reduced to the desired voltage (i.e., the voltage at point a Va = the reference voltage 2.5V), the power switching control function is achieved by using two different output results: Va>2.5V and Va<2.5V.

[0093] The adaptive power switching control system based on multiple power supplies provided in this embodiment of the invention includes a three-terminal voltage regulator circuit 60 comprising a three-terminal adjustable shunt parallel regulator U5 and a voltage divider circuit. By fully utilizing the operating characteristics of the three-terminal adjustable shunt parallel regulator U5, and based on the relationship between its reference terminal voltage and the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator U5, a high / low level signal is output to control the conduction or disconnection of the first controlled switch Q7, thereby realizing the switching between the external power supply circuit 20 and the internal power supply circuit 30. By setting the voltage divider circuit, the stable operation of the three-terminal adjustable shunt parallel regulator U5 is ensured, thereby ensuring the efficient and stable operation of the adaptive power switching control system based on multiple power supplies.

[0094] Specifically, in one embodiment, such as Figure 2 As shown, the three-terminal voltage regulator circuit 60 further includes:

[0095] A diode, wherein the anode of the diode is connected to the control terminal of the first controlled switch Q7, and the cathode is connected to the output terminal of the three-terminal adjustable shunt parallel voltage regulator U5;

[0096] The first resistor R9 has one end connected to the input terminal of the external power supply circuit 20 and the other end connected to the input terminal of the three-terminal adjustable shunt parallel regulator U5.

[0097] Specifically, in practical applications, such as Figure 2 As shown, each diode is connected to the output terminal of the corresponding three-terminal adjustable shunt parallel regulator U5, which effectively isolates each external power supply circuit 20 from each other, preventing interference from other external power supply circuits 20 when switching from external power supply circuit 20 to internal power supply circuit 30, and greatly improving the stability of power switching control.

[0098] The adaptive power switching control system based on multiple power supplies provided in this embodiment of the invention includes a three-terminal voltage regulator circuit 60 that further includes a diode and a first resistor R9. By setting the diode, mutual interference between external power supplies with different supply voltages is avoided. By cooperating with the first resistor R9, the external power supply circuit 20 can be quickly switched to the internal power supply circuit 30, while isolating each external power supply circuit 20 from each other, further ensuring the smooth operation during the switching control process.

[0099] Specifically, in one embodiment, such as Figure 2 As shown, the system further includes: a second resistor R12 and a third resistor R13, wherein,

[0100] One end of the second resistor R12 is connected to the output terminal of the three-terminal adjustable shunt parallel regulator U5, and the other end is connected to one end of the third resistor R13 and the control terminal of the first controlled switch Q7 respectively.

[0101] The other end of the third resistor R13 is connected to the input terminal of the external power supply circuit 20.

[0102] The adaptive power switching control system based on multiple power sources provided in this embodiment of the invention, by setting a second resistor R12 and a third resistor R13, not only effectively ensures the stable operation of each three-terminal voltage regulator circuit 60, but also assists the first controlled switch Q7 and the power switching control circuit 10 in flexibly switching from the external power supply circuit 20 to the internal power supply circuit 30, avoiding the situation where the target device stops due to excessive power outage time, and greatly improving user satisfaction.

[0103] Specifically, in one embodiment, the power control switching circuit includes: a fifth controlled switch Q3, the control terminal of the fifth controlled switch Q3 is connected to the second terminal of the first controlled switch Q7, the first terminal is connected to the control terminal of the internal power supply circuit 30, and the second terminal is grounded.

[0104] As one implementation of this embodiment, the fifth controlled switch Q3 can be a transistor, but the actual situation is not limited to this.

[0105] Specifically, such as Figure 2 As shown, the power switching control circuit 10 also includes a corresponding current-limiting resistor. For detailed control process, please refer to the relevant description in the prior art, which will not be repeated here.

[0106] The adaptive power switching control system based on multiple power sources provided in this embodiment of the invention switches between the external power supply circuit 20 and the internal power supply circuit 30 through the fifth controlled switch Q3, ensuring normal use of the target equipment by the user, avoiding mid-term shutdown of the target equipment, and greatly improving user satisfaction.

[0107] like Figure 1 As shown, V_IN represents the external input power supply, VBAT represents the internal battery power supply, and VCC represents the system power supply. By switching U1 / U2 / U3 / U4 on and off, VCC is switched to V_IN or VBAT. When V_IN is connected to the external adapter power supply, resistor R1 drives transistor Q1 to conduct. After Q1 conducts, U1 and U2 switches conduct, and VCC and V_IN conduct to supply power to the system. At the same time, R8 drives transistor Q3 to conduct, the base of transistor Q2 is pulled low, transistor Q2 is cut off, and U3 and U4 switches are turned off, disconnecting VCC and VBAT and cutting off battery power.

[0108] When the external adapter is powered off, V_IN is de-energized, Q1 and Q3 are cut off, Q2 is connected to VBAT through R6 and R4, Q2 is turned on, thus U3 and U4 are turned on, and VCC is connected to VBAT to supply power to the whole system.

[0109] However, in practical applications, large electrolytic capacitors are present in the external power supply output. These capacitors store energy, and when the external power supply circuit 20 is turned off, the output voltage does not immediately drop to 0. Instead, it decreases slowly in a curved manner. The power-down time varies depending on the capacitor value, generally ranging from tens to hundreds of milliseconds. For Q1 and Q3 to completely turn off, the base voltage needs to drop below 0.7V, which takes a considerable amount of time. The internal battery voltage cannot switch immediately, causing a power outage at VCC, resulting in machine shutdown and affecting overall operation. Furthermore, if multiple external input voltages exist, the circuit cannot be fully compatible and switch effectively. As a specific implementation, the adaptive power switching control system provided in this embodiment of the invention operates as follows:

[0110] (1) Adaptive power switching control based on a single power supply:

[0111] like Figure 2 As shown, taking V_IN as a 12V voltage as an example, assuming the input V_IN is 12V, after the input power is lost, the V_IN voltage needs to drop to 11V to ensure that transistors Q1 and Q3 stop working, ensure that U1 and U2 stop working, and U3 and U4 are turned on so that VCC is connected to VBAT, and the VCC voltage switches from V_IN to VBAT power supply.

[0112] Specifically, when the operating conditions of the first controlled switch Q7 are met (low-level drive of the PNP transistor base), after Q7 is turned on, the bases of transistors Q1 and Q3 are connected to V_IN through resistors R1 and R8. This satisfies the operating conditions of transistors Q1 and Q3. After Q1 is turned on, U1 and U2 are turned on, and the VCC voltage is connected to V_IN. After Q3 is turned on, the base of Q3 is pulled low, Q2 is turned off, and simultaneously U3 and U4 are disconnected, disconnecting VCC from VBAT. At this time, the entire target device is powered by V_IN.

[0113] When V_IN is de-energized, the voltage drops from 12V to below 11V, Va < 2.5V, which does not meet the operating conditions of U5, so U5 is cut off. At this time, the voltage at point ON-1 is pulled up to V_IN (high level) by R9. At this time, the conduction condition of transistor Q7 is not met, so Q7 is turned off. Q1 and Q3 have no driving voltage and do not meet the operating conditions, so Q1 and Q3 are cut off. Since Q1 is cut off, U1 and U2 are turned off. Since Q3 is cut off, Q2 is connected to VBAT through resistors R6 and R4, which meets the turn-on condition, so Q2 is turned on. U3 and U4 are turned on, and the VCC voltage switches from V_IN to VBAT, thus quickly completing the voltage conversion.

[0114] (2) Adaptive power switching control based on dual power supplies:

[0115] When the external power supply input voltage is not only 12V but also 9V, in order to accommodate both voltages, add, for example Figure 4 The circuit shown assumes that the input V_IN = 9V. The voltage Vb at point b is set to 2.5V when V_IN = 8V through resistors R17 and R16. The voltage at point ON-2 is controlled to be high or low through U6. The circuit operation process is similar to the above-described adaptive power switching control based on a single power supply, and will not be described again here.

[0116] At this point, it is necessary to consider that V_IN is 12V. Figure 4 Since part of the circuit is not working, the operation of U6 is controlled by transistors Q13, Q12, and Q14. When the input is 12V, ON-1 is low, Q13 conducts, driving Q14 to conduct through resistor R19, thus turning off Q12. This disconnects U6 from ground, causing U6 to turn off. At this time, ON-2 is pulled high through R14. Therefore, when the input is 12V, only... Figure 3 The circuitry involved inside, Figure 4 The internal circuitry is not working when the input is 9V. Figure 4 The circuitry involved inside, Figure 3 The circuitry involved is not working.

[0117] Meanwhile, when the input is 12V, to prevent the voltage from dropping to 9V... Figure 4 When the circuit is turned on, the VCC voltage is switched back to V_IN. In this embodiment of the invention, C20 is added, and a delay circuit is formed by charging C20 through resistor R18 to ensure that Q12 will not be turned on during this period.

[0118] Assume there are three possible external input voltages: 12V, 9V, and 5V. Figure 2 , 3 Circuits 4 and 5 can be effectively distinguished and switched, and the principle is as follows:

[0119] like Figure 2 As shown, by adding transistor Q7, the conduction and cutoff of transistors Q1 and Q3 can be controlled to achieve the switching of system voltage.

[0120] Transistor Q7 is connected to diodes D1, D2, and D3 via resistor R12, and is connected to drive signals ON-1, ON-2, and ON-3 respectively. When the drive signal is low, transistor Q7 is turned on, and transistors Q1 and Q3 are also turned on. When the drive signal is high, transistor Q7 is turned off.

[0121] Assuming the input voltages V_IN are 12V, 9V, and 5V respectively, and based on the working principle of U5, its threshold voltage is set to 2.5V, thus employing... Figure 3 , Figure 4 and Figure 5 The power switching control logic shown distinguishes and shuts off three voltages respectively. At this time, the reference voltages of the three-terminal voltage regulator circuit 60 corresponding to ON-1, ON-2 and ON-3 are 11V, 8V and 5V respectively.

[0122] When the first-stage three-terminal voltage regulator circuit is used as an external power supply, after V_IN corresponding to the first-stage three-terminal voltage regulator circuit is less than 11V... Figure 3 Internal U5 outputs a low level, thereby controlling the external power supply circuit 20 to stop working; when the second-stage three-terminal voltage regulator circuit is used as an external power supply, after V_IN corresponding to the second-stage three-terminal voltage regulator circuit is less than 8V... Figure 4 Internal U6 outputs a low level, thereby controlling the external power supply circuit 20 to stop working; when the third-stage three-terminal voltage regulator circuit is used as the external power supply, after the V_IN corresponding to the third-stage three-terminal voltage regulator circuit is less than 4V... Figure 5 When the internal U7 outputs a low level, it controls the external power supply circuit 20 to stop working. By outputting a low level to the three three-terminal voltage regulator circuits 60, the control switching function after the power failure of the three different voltage inputs is realized.

[0123] When V_IN is set to less than 11V by the voltage divider resistors R10 and R11, the voltage at point a is less than 2.5V, U5 stops working, and ON-1 is pulled up to a high level; otherwise, it is low. When V_IN is set to less than 8V by the voltage divider resistors R17 and R16, the voltage at point b is less than 2.5V, U6 stops working, and ON-2 is pulled up to a high level; otherwise, it is low. When V_IN is set to less than 4V by the voltage divider resistors R24 and R25, the voltage at point c is less than 2.5V, U7 stops working, and ON-3 is pulled up to a high level; otherwise, it is low.

[0124] When V_IN is 12V and power is lost, when the voltage drops below 11V, U5 stops working, ON-1 is pulled up to a high level, Q7 is cut off, Q1 and Q3 are cut off, Q2 is turned on, and VCC is connected to VBAT for power supply.

[0125] like Figure 4 As shown, to ensure that ON-2 and ON-3 remain high when V_IN is below 11V, thus preventing Q7 from conducting, Q12 needs to remain off. At this time, an RC circuit is formed by resistor R18 and capacitor C20. By controlling the charging time of C20, the conduction time of Q12 is delayed. The delay time can be set by changing the resistance value and the capacitance value to ensure that Q12 remains off within the required time.

[0126] like Figure 5 As shown, the RC circuit of resistor R27 and C21 delays the turn-on of Q9, keeping ON-2 and ON-3 at a high level to prevent Q7 from turning on after it is turned off, thus ensuring normal power switching.

[0127] Simultaneously, during the low level period of ON-1, ON-2 and ON-3 must be high, combined with... Figure 4 and Figure 5 As shown, ON-1 drives transistors Q13 and Q10 to conduct, which in turn turns on transistors Q14 and Q11, and turns off transistors Q12 and Q9. At this time, U6 and U7 do not work, and ON-2 and ON-3 are pulled up to a high level.

[0128] When V_IN input is 9V, such as Figure 3 As shown, at this time, point a has less than 2.5V, so U5 is not working. ON-1 is pulled high, Q13 and Q14 are cut off, Q12 turns on, U6 works, ON-2 outputs low, driving transistor Q7 to conduct, VCC is connected to V_IN, and VBAT is disconnected. When the voltage drops below 8V, U6 stops working, ON-2 is pulled high, Q7 is cut off, and VCC is connected to VBAT. At the same time, Q15 and Q8 are cut off, V_IN charges C21 through R27, delaying Q9 from turning on, preventing ON-3 from outputting low and Q7 from turning on repeatedly, ensuring normal switching of VCC power supply.

[0129] Similarly, when V_IN inputs 5V, ON-3 outputs a low level, while ON-1 and ON-2 output a high level. When the voltage drops below 4V, ON-3 is pulled up to a high level, and Q7 is cut off, thus achieving VBAT voltage switching.

[0130] As shown above, this circuit can quickly switch the VCC power supply under multiple voltage input conditions, achieve compatibility with multiple voltage input sources, and at the same time achieve the goal of shortening the power failure range and switching circuit time. While avoiding power failure of the whole system and load stop working during switching, it also ensures that the whole load operates normally during the moment of power supply switching, thus improving the user experience.

[0131] Example 2

[0132] like Figure 6 As shown, an embodiment of the present invention provides an adaptive power switching control device based on multiple power sources, including an adaptive power switching control system based on multiple power sources as described in another embodiment of the present invention.

[0133] For details regarding the aforementioned adaptive power switching control device based on multiple power sources, please refer to the relevant descriptions and effects of the adaptive power switching control system based on multiple power sources in the other embodiment described above. These details will not be repeated here.

[0134] The adaptive power switching control device based on multiple power sources provided in this embodiment of the invention, by setting up an adaptive power switching control system based on multiple power sources as described in another embodiment of the invention, ensures that the target device can be powered by any external power source, and can also switch from external power supply circuit mode to internal power supply circuit mode to power it. The charging flexibility is greatly improved. While avoiding the long power outage time caused by large electrolytic capacitors in the external adapter of the target device, which could lead to the shutdown of the whole machine, the voltage switching time is greatly shortened, realizing instant switching of charging voltage, thereby bringing a better user experience.

[0135] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An adaptive power switching control system based on multiple power sources, comprising: The system includes a power switching control circuit and external and internal power supply circuits respectively connected to the power supply terminals of the target device. The power switching control circuit is used to switch between the external and internal power supply circuits to supply power to the target device. The system further includes a first controlled switch and three-terminal voltage regulator circuits corresponding one-to-one with external power supplies having different supply voltages. The reference terminal of each three-terminal voltage regulator circuit is connected to the input terminal of the external power supply circuit, the ground terminal is grounded, and the output terminal is connected to the control terminal of the first controlled switch. The first terminal of the first controlled switch is connected to the input terminal of the external power supply circuit, and the second terminal is connected to the control terminal of the external power supply circuit and the control terminal of the power switching control circuit, respectively. The output of each three-terminal voltage regulator circuit outputs a high / low level signal based on the relationship between the voltage connected to its reference terminal and its corresponding preset reference voltage, in order to control the first controlled switch to be turned on or off, thereby realizing the switching between the external power supply circuit and the internal power supply circuit. The preset reference voltage corresponding to each three-terminal voltage regulator circuit is less than or equal to the supply voltage of its corresponding external power supply.

2. The adaptive power switching control system based on multiple power sources according to claim 1, characterized in that, Each three-terminal voltage regulator circuit determines its control priority according to the supply voltage of its corresponding external power supply from large to small. A delay control circuit is provided between the three-terminal voltage regulator circuit with high control priority and all three-terminal voltage regulator circuits with lower control priority. The control terminal of the delay control circuit is connected to the output terminal of the three-terminal voltage regulator circuit with high control priority, the input terminal is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the three-terminal voltage regulator circuit with low control priority. It is used to maintain the output of the three-terminal voltage regulator circuit with low control priority for a certain period of time when the output terminal of the three-terminal voltage regulator circuit with high control priority outputs a low-level signal.

3. The adaptive power switching control system based on multiple power sources according to claim 2, characterized in that, The delay control circuit includes: an RC circuit, an RC control circuit, and a second controlled switch, wherein the second controlled switch is disposed between the ground terminal of the three-terminal voltage regulator circuit with low control priority and ground; The control terminal of the second controlled switch is connected to the output terminal of the RC circuit, the first terminal is connected to the ground terminal of the three-terminal voltage regulator circuit with low control priority, and the second terminal is grounded; The control terminal of the RC control circuit is connected to the output terminal of the three-terminal voltage regulator circuit with high control priority, the input terminal is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the RC circuit. It is used to control the RC circuit to charge when the output terminal of the three-terminal voltage regulator circuit with high control priority outputs a low-level signal, so as to delay the second controlled switch from turning on.

4. The adaptive power switching control system based on multiple power sources according to claim 3, characterized in that, The RC circuit includes: a fourth resistor and a first capacitor, wherein, One end of the fourth resistor is connected to the input terminal of the external power supply circuit, and the other end is connected to the output terminal of the RC control circuit, one end of the first capacitor, and the control terminal of the second controlled switch. The other end of the first capacitor is grounded.

5. The adaptive power switching control system based on multiple power sources according to claim 4, characterized in that, The RC control circuit includes: a third controlled switch and a fourth controlled switch, wherein, The control terminal of the third controlled switch is connected to the output terminal of the three-terminal voltage regulator circuit with a higher control priority, the first terminal is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the control terminal of the fourth controlled switch. The first terminal of the fourth controlled switch is connected to the other terminal of the fourth resistor, and the second terminal is grounded.

6. The adaptive power switching control system based on multiple power sources according to claim 1, characterized in that, The three-terminal voltage regulator circuit includes: a three-terminal adjustable shunt parallel voltage regulator and a voltage divider circuit, wherein... The input terminal of the voltage divider circuit is connected to the input terminal of the external power supply circuit, and the output terminal is connected to the reference terminal of the three-terminal adjustable shunt parallel regulator. The input terminal of the three-terminal adjustable shunt parallel regulator is grounded, and the output terminal of the three-terminal adjustable shunt parallel regulator is connected to the input terminal of the external power supply circuit through a resistor. The output terminal of the three-terminal adjustable shunt parallel regulator is also connected to the control terminal of the first controlled switch. When the reference voltage of the three-terminal adjustable shunt parallel regulator is less than the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator, the output terminal of the three-terminal adjustable shunt parallel regulator outputs a high-level signal. When the reference terminal voltage of the three-terminal adjustable shunt parallel regulator is not less than the corresponding reference voltage of the three-terminal adjustable shunt parallel regulator, the output terminal of the three-terminal adjustable shunt parallel regulator outputs a low-level signal.

7. The adaptive power switching control system based on multiple power sources according to claim 6, characterized in that, The three-terminal voltage regulator circuit also includes: A diode, wherein the anode of the diode is connected to the control terminal of the first controlled switch, and the cathode is connected to the output terminal of the three-terminal adjustable shunt parallel voltage regulator; The first resistor has one end connected to the input terminal of the external power supply circuit and the other end connected to the input terminal of the three-terminal adjustable shunt parallel voltage regulator.

8. The adaptive power switching control system based on multiple power sources according to claim 6, characterized in that, The system further includes: a second resistor and a third resistor, wherein, One end of the second resistor is connected to the output terminal of the three-terminal adjustable shunt parallel voltage regulator, and the other end is connected to one end of the third resistor and the control terminal of the first controlled switch, respectively. The other end of the third resistor is connected to the input terminal of the external power supply circuit.

9. The adaptive power switching control system according to claim 1, characterized in that, The power switching control circuit includes: a fifth controlled switch, the control terminal of the fifth controlled switch being connected to the second terminal of the first controlled switch, the first terminal being connected to the control terminal of the internal power supply circuit, and the second terminal being grounded.

10. An adaptive power switching control device based on multiple power sources, characterized in that, Including the adaptive power switching control system based on multiple power sources as described in any one of claims 1-9.

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