Dual-power-supply switching power supply management circuit and power supply equipment

Abstract

The utility model discloses a power supply management circuit for dual power supply switching and power supply equipment, the power supply management circuit for dual power supply switching comprises a first power supply input end, a second power supply input end and a power supply output end, the first power supply input end is used for being electrically connected with an external power supply, and the second power supply input end is used for being electrically connected with an internal power supply; the input end of the first switch module is electrically connected with the first power supply input end, the output end of the first switch module is electrically connected with the first end of the second switch module and the power supply output end, and the second end of the second switch module is electrically connected with the second power supply input end; and the third end of the second switch module is electrically connected with the power supply output end. The timeliness of switching the power supply equipment to different power supplies can be improved, so that the power supply efficiency of the power supply equipment is improved.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of power management technology, and in particular to a power management circuit and power supply equipment with dual power supply switching. Background Technology

[0002] With the continuous advancement of modern technology, power supply equipment has been widely used in various fields. Power supply equipment supports both internal and external power supply to ensure its normal operation.

[0003] In related technologies, multi-source power supply operation of electrical equipment is achieved by switching between internal and external power supply methods. However, the power supply circuits used in these technologies are relatively complex, making it difficult to switch between different power sources in a timely manner, thus affecting the power supply efficiency of the equipment. Utility Model Content

[0004] This application provides a power management circuit and power supply device with dual power supply switching, which can improve the timeliness of the power supply device switching to different power supplies, thereby improving the power supply efficiency of the power supply device.

[0005] In a first aspect, embodiments of this application provide a power management circuit with dual power supply switching, comprising:

[0006] The system includes a first power input terminal, a second power input terminal, and a power output terminal. The first power input terminal is used to connect to an external power source, and the second power input terminal is used to connect to an internal power source.

[0007] A first switch module and a second switch module, wherein the input terminal of the first switch module is electrically connected to the first power input terminal, the output terminal of the first switch module is electrically connected to the first terminal and the power output terminal of the second switch module, the second terminal of the second switch module is electrically connected to the second power input terminal, and the third terminal of the second switch module is electrically connected to the power output terminal;

[0008] Wherein, the first switch module is turned on when it receives a first electrical signal from the first power input terminal, and after being turned on, the first switch module transmits a second electrical signal to the first terminal of the second switch module; the second terminal of the second switch module is turned off when it receives the second electrical signal.

[0009] According to some embodiments of this application, the first switch module includes a first switch transistor and a second switch transistor. The first end of the first switch transistor is electrically connected to the first power input terminal, the second end of the first switch transistor is grounded, the third end of the first switch transistor is electrically connected to the first end of the second switch transistor, the second end of the second switch transistor is electrically connected to the first end of the second switch module, and the third end of the second switch transistor is grounded.

[0010] According to some embodiments of this application, the second switch module includes a third switch transistor and a fourth switch transistor. The first ends of the third switch transistor and the fourth switch transistor are both electrically connected to the output terminal of the first switch module. The second end of the third switch transistor is used to connect to the internal power supply. The third end of the third switch transistor is electrically connected to the second end of the fourth switch transistor. The third end of the fourth switch transistor is electrically connected to the power supply output terminal.

[0011] According to some embodiments of this application, a signal control terminal is also included, which is electrically connected to the first power input terminal and the input terminal of the first switch module, respectively.

[0012] According to some embodiments of this application, when the signal control terminal receives a third electrical signal from the first power input terminal, it sends a fourth electrical signal to the input terminal of the first switch module, and the first switch module turns off when it receives the fourth electrical signal.

[0013] According to some embodiments of this application, it further includes a first voltage regulator module and a first load module, one end of the first voltage regulator module and the first load module are electrically connected to the output terminal of the first switch module, and the other end of the first voltage regulator module and the first load module are electrically connected to the third terminal of the third switch and the second terminal of the fourth switch, respectively.

[0014] According to some embodiments of this application, a third switch module is also included, wherein the first and second ends of the third switch module are both electrically connected to the first power input terminal, and the third end of the third switch module is grounded.

[0015] According to some embodiments of this application, the first power input terminal is used to send a fifth electrical signal to the third switch module, the third switch module is used to turn on when receiving the fifth electrical signal and turn off when receiving a sixth electrical signal, wherein the fifth electrical signal and the sixth electrical signal have opposite polarities.

[0016] According to some embodiments of this application, it further includes a voltage suppression module and an energy storage module, one end of which is electrically connected to the first power input terminal, and the other end of which is grounded.

[0017] Secondly, embodiments of this application also provide a power supply device, including the dual-power switching power management circuit described in any one of the first aspects.

[0018] The embodiments of this application include at least the following beneficial effects: The power management circuit for dual power supply switching proposed in the embodiments of this application includes a first power input terminal, a second power input terminal, and a power output terminal. The first power input terminal is used for electrical connection to an external power supply, and the second power input terminal is used for electrical connection to an internal power supply. A first switch module and a second switch module are also included. The input terminal of the first switch module is electrically connected to the first power input terminal, the output terminal of the first switch module is electrically connected to the first terminal and the power output terminal of the second switch module, the second terminal of the second switch module is electrically connected to the second power input terminal, and the third terminal of the second switch module is electrically connected to the power output terminal. The first switch module is turned on when it receives a first electrical signal from the first power input terminal, and after being turned on, it transmits a second electrical signal to the first terminal of the second switch module. The second terminal of the second switch module is turned off when it receives the second electrical signal. The embodiments of this application can improve the timeliness of power supply equipment switching to different power supplies, thereby improving the power supply efficiency of the power supply equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the circuit module structure of a power management circuit with dual power supply switching provided in one embodiment of this application;

[0020] Figure 2 This is a first circuit diagram of a power management circuit with dual power supply switching provided in one embodiment of this application;

[0021] Figure 3 This is a second circuit diagram of a power management circuit with dual power supply switching provided in one embodiment of this application;

[0022] Figure label:

[0023] First power input terminal 110, second power input terminal 120, power output terminal 130, first switching module 140, first switching transistor 141, second switching transistor 142, second switching module 150, third switching transistor 151, fourth switching transistor 152, signal control terminal 160, first voltage regulator module 171, first load module 172, voltage suppression module 181, energy storage module 182, and third switching module 190. Detailed Implementation

[0024] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0025] It should be understood that in the description of the embodiments of this application, "a few" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of terms such as "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of the embodiments of this application, unless otherwise expressly limited, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this application in combination with the specific content of the technical solution.

[0027] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The following is combined with Figures 1 to 3 The embodiments of this application will be further described below, wherein each structure Figures 1 to 3 Both are mentioned in the text.

[0029] With the continuous advancement of modern technology, power supply equipment has been widely used in various fields. Power supply equipment supports both internal and external power supply to ensure its normal operation.

[0030] In related technologies, multi-source power supply operation of electrical equipment is achieved by switching between internal and external power supply methods. However, the power supply circuits used in these technologies are relatively complex, making it difficult to switch between different power sources in a timely manner, thus affecting the power supply efficiency of the equipment.

[0031] Based on this, the embodiments of this application propose a power management circuit and power supply equipment with dual power supply switching, which will be described in detail below, and the beneficial effects of the embodiments of this application will gradually become apparent.

[0032] like Figure 1 As shown, Figure 1 This is a schematic diagram of the circuit module structure of a dual-power switching power management circuit according to an embodiment of this application, wherein the dual-power switching power management circuit includes:

[0033] The system includes a first power input terminal 110, a second power input terminal 120, and a power output terminal 130. The first power input terminal 110 is used to connect to an external power source, and the second power input terminal 120 is used to connect to an internal power source.

[0034] A first switch module 140 and a second switch module 150 are connected. The input terminal of the first switch module 140 is electrically connected to the first power input terminal 110. The output terminal of the first switch module 140 is electrically connected to the first terminal and the power output terminal 130 of the second switch module 150. The second terminal of the second switch module 150 is electrically connected to the second power input terminal 120. The third terminal of the second switch module 150 is electrically connected to the power output terminal 130.

[0035] The first switch module 140 is turned on when it receives a first electrical signal from the first power input terminal 110. After being turned on, the first switch module 140 transmits a second electrical signal to the first terminal of the second switch module 150. The second terminal of the second switch module 150 is turned off when it receives the second electrical signal.

[0036] According to some embodiments of this application, the first power input terminal 110 of the dual-power switching power management circuit (hereinafter also referred to as the "circuit" for ease of description) is used to be electrically connected to an external power source, and the second power input terminal 120 is used to be electrically connected to an internal power source. The external power source can be AC ​​power, solar power, generator power, etc.; the internal power source can be a backup battery, such as a battery or supercapacitor. The external and internal power sources can be selected according to actual conditions, and this application does not impose any limitations on this. It is necessary to... Figure 1 It should be noted that, Figure 1 The three connection terminals of the first switch module shown indicate that the input terminal of the first switch module is electrically connected to the first power input terminal 110, and the output terminal of the first switch module 140 is electrically connected to the first terminal and the power output terminal 130 of the second switch module 150, respectively. Figure 1 This is for ease of understanding only and does not conflict with the textual descriptions in the embodiments of this application.

[0037] like Figure 2 As shown, Figure 2 This is a first circuit diagram of a power management circuit with dual power supply switching provided in one embodiment of this application. Further, the first power input terminal 110 further includes a first positive input terminal (…). Figure 2 110+ in the middle) and the first negative input terminal ( Figure 2 The first positive input terminal (110-) is used to connect to the positive terminal of the external power supply, and the first negative input terminal is used to connect to the negative terminal of the external power supply.

[0038] Furthermore, the power output terminal 130 is the final output terminal of the circuit. The power output terminal 130 is used to electrically connect to the electrical device and supply power to the device. The power supply received by the power output terminal 130 can come from an external power source or an internal power source. The electrical device can be a power bank, an electric fan, a printer, etc. The electrical device connected to the power output terminal 130 can be adapted to the actual situation, but this embodiment does not make any adjustments in this regard.

[0039] It should be noted first that the term "electrical connection" in the embodiments of this application, also known as "electrical link," is a description of the connection relationship used to illustrate this characteristic of the circuit when describing the circuit structure of a product. It can be understood as the form in which different components in the circuit structure are connected through physical lines that can transmit electrical signals, such as copper foil on a printed circuit board (PCB) or wires. It is understood that the two electronic components in an "electrical connection" can be directly connected, or indirectly connected by other electronic components in between.

[0040] In other words, in the power management circuit with dual power switching proposed in this application embodiment, other components can be set between electronic components that are electrically connected, depending on the actual situation. For example, a load module can also be set between the first power input terminal 110 and the first switch module 140. The load module can include one or more resistors. When the load module is composed of multiple resistors, the connection between the multiple resistors can be in series or in parallel. This application does not limit this.

[0041] The first switch module 140 is electrically connected to the first power input terminal 110 and the power output terminal 130. When the first power input terminal 110 receives an electrical signal (first electrical signal) from an external power source, and the first switch module 140 detects the presence of the first electrical signal, it determines that the external power source is working normally. At this time, the first switch module 140 is turned on, allowing the first electrical signal from the external power source to be transmitted to the power output terminal 130. Simultaneously, the output terminal of the first switch module 140 also transmits a second electrical signal to the first terminal of the second switch module 150. The function of the second electrical signal is to control the working state of the second switch module 150. Specifically, the second terminal of the second switch module 150 is turned off when it receives the second electrical signal indicating that it has entered the off state. As a result, the internal power source cannot provide power to the electrical equipment through the power output terminal 130 via the second switch module 150, and the external power source provides power to the electrical equipment through the power output terminal 130 via the first switch module 140.

[0042] The second switch module 150 is electrically connected to the second power input terminal 120 and the power output terminal 130. When the first power input terminal 110 does not receive an electrical signal (first electrical signal) from an external power source, the first switch module 140 remains in the off state. Since the first switch module 140 is not conducting, the first terminal of the second switch module 150 will not receive the second electrical signal, so the second switch module 150 enters the conducting state. Consequently, the power supplied by the external power source cannot supply power to the electrical equipment through the first switch module 140 and the power output terminal 130. Instead, the internal power source supplies power to the electrical equipment through the second switch module 150 and the power output terminal 130.

[0043] Furthermore, the power supply equipment can enter the operating state based on its internal power supply when no external power is connected, and cut off the internal power supply when an external power supply is connected. Traditional dual-power switching circuits usually require complex control logic and multiple switching elements to achieve switching between different power supplies. The embodiments of this application achieve a simple and efficient automatic switching function through the simple cooperation of the first switching module 140 and the second switching module 150, ensuring that power switching can be completed within milliseconds, improving the timeliness of the power supply equipment switching to different power supplies, thereby improving the power supply efficiency of the power supply equipment. In addition, the simple circuit provided by the embodiments of this application also reduces hardware costs and design difficulty, thus enabling it to be well integrated into small power supply equipment, saving installation space and weight.

[0044] like Figure 2 , Figure 3 As shown, Figure 3 This is a second circuit diagram of a power management circuit with dual power supply switching provided in one embodiment of this application. According to some embodiments of this application, the first switch module 140 includes a first switch transistor 141 and a second switch transistor 142. The first end of the first switch transistor 141 is electrically connected to the first power input terminal 110, the second end of the first switch transistor 141 is grounded, the third end of the first switch transistor 141 is electrically connected to the first end of the second switch transistor 142, the second end of the second switch transistor 142 is electrically connected to the first end of the second switch module 150, and the third end of the second switch transistor 142 is grounded.

[0045] According to some embodiments of this application, when the first switching module 140 includes a first switching transistor 141 and a second switching transistor 142, the first terminal of the first switching transistor 141 serves as the input terminal of the first switching module 140, and the second terminal of the second switching transistor 142 serves as the output terminal of the first switching module 140. Both the first switching transistor 141 and the second switching transistor 142 can be NPN transistors. An NPN transistor is a transistor composed of two N-type semiconductors sandwiching a P-type semiconductor. An NPN transistor can convert a weak electrical signal into a signal of a certain strength. An NPN transistor has three terminals: a base (B), an emitter (E), and a collector (C). When the NPN transistor is turned on, current flows from the base and collector to the emitter.

[0046] Furthermore, such as Figure 2 , Figure 3 As shown, the base of the first switching transistor 141 is electrically connected to the first power input terminal 110, the emitter of the first switching transistor 141 is grounded, the collector of the first switching transistor 141 is electrically connected to the base of the second switching transistor 142, the collector of the second switching transistor 142 is electrically connected to the first terminal of the second switching module 150, and the emitter of the second switching transistor 142 is grounded.

[0047] Furthermore, the first switch module 140 ensures that current flows from the external power source to the electrical equipment, avoiding the risk of short circuits caused by backflow of current from the internal power source into the first switch module. Additionally, in this embodiment, the first switch module 140, through the coordinated operation of two switching transistors, ensures that when one switching transistor fails, the other can continue to operate, guaranteeing timely power switching and ensuring normal circuit operation, thus improving circuit reliability and fault tolerance.

[0048] It should be noted that the switching transistors in the first switching module 140 can also be N-channel field-effect transistors, P-channel field-effect transistors, or insulated-gate bipolar transistors (IGBTs). That is, this application embodiment does not limit the specific type of each switching transistor in the first switching module 140, and can set it according to actual conditions. When other types of switching transistors are selected, the circuit of this application embodiment will be adjusted accordingly, which will not be detailed here.

[0049] Furthermore, in this embodiment, the first switching transistor 141 can also be electrically connected to other load modules. For example, the first switching transistor 141 can also be electrically connected to resistors R126 and R134. For another example, the first switching transistor 141 can be electrically connected to resistor R126 with a resistance of 10 kΩ and resistor R134 with a resistance of 100 kΩ. Resistors R126 and R134 can limit current and prevent damage to the first switching transistor 141 due to excessive current.

[0050] Furthermore, when an external power source provides power, current flows to the second terminal of the first switching transistor 141 and through... Figure 2 BAT-OFF end transmission to Figure 3 The current flows to the BAT-OFF terminal; then, the current flows to the second switching transistor 142, the second switching module 150, and finally flows out from the power output terminal 130.

[0051] Furthermore, the second switch 142 can also be electrically connected to other load modules. For example, the gate of the second switch 142 is electrically connected to resistors R116 and R137, and the collector of the second switch 142 is electrically connected to resistor R109. As another example, the gate of the second switch 142 is electrically connected to one end of resistors R116 (10KΩ) and R137 (1KΩ); then, the other end of resistor R116 is electrically connected to the emitter of the second switch 142, and the other end of resistor R137 is electrically connected to resistor R115 (2KΩ) and the BAT-OFF terminal; the other end of resistor R115 is electrically connected to the signal control terminal 160. The collector of the second switch 142 is electrically connected to one end of resistor R109 (1KΩ), and the other end of resistor R109 is electrically connected to the second switch module 150. Among them, resistor R116 serves as a pull-down resistor, which can prevent the gate / base of the second switch 142 from being in a "floating" state, thus preventing the second switch 142 from being falsely triggered; resistors R137, R115, and R109 can play the role of current limiting protection.

[0052] According to some embodiments of this application, the second switch module 150 includes a third switch transistor 151 and a fourth switch transistor 152. The first ends of both the third switch transistor 151 and the fourth switch transistor 152 are electrically connected to the output terminal of the first switch module 140. The second end of the third switch transistor 151 is used to connect to an internal power supply. The third end of the third switch transistor 151 is electrically connected to the second end of the fourth switch transistor 152. The third end of the fourth switch transistor 152 is electrically connected to the power output terminal 130.

[0053] According to some embodiments of this application, when the second switch module 150 includes a third switch tube 151 and a fourth switch tube 152, the first ends of the third switch tube 151 and the fourth switch tube 152 are both used as the first ends of the second switch module 150, the second end of the third switch tube 151 is used as the second end of the second switch module 150, and the third end of the fourth switch tube 152 is used as the third end of the second switch module 150.

[0054] According to some embodiments of this application, the third switch 151 and the fourth switch 152 are both P-channel field-effect transistors. The gates of the third switch 151 and the fourth switch 152 are both electrically connected to the output terminal of the first switch module 140. The drain of the third switch 151 is used to connect to the internal power supply. The source of the third switch 151 is electrically connected to the source of the fourth switch 152. The drain of the fourth switch 152 is electrically connected to the power output terminal 130.

[0055] Among them, the P-channel MOSFET (also known as a "PMOS transistor") is a semiconductor device that uses the electric field effect to control current. When the gate of the PMOS transistor receives a low-level signal (i.e., U), the current is controlled by the electric field. G1 When the voltage is less than the first threshold voltage, the circuit is turned on, allowing current to flow from the source to the drain.

[0056] Furthermore, when the internal power supply provides power, the current flows through the body diode inherent in the third switch 151 (PMOS transistor) to the first load module 172 and the first voltage regulator module 171, and then to the fourth switch 152. The fourth switch 152 is turned on, and the current flows from the source of the fourth switch 152 to the drain of the fourth switch 152. Since the drain of the fourth switch 152 is electrically connected to the power output terminal 130, the electrical equipment connected to the power output terminal 130 can enter the operating state based on the internal power supply.

[0057] Furthermore, when an external power supply provides power, the current flows through the first switching module 140 to the second switching module 150. At this time, the third switching transistor 151 of the second switching module 150 receives a second electrical signal from the second switching module 150. The third switching transistor 151 does not meet the conduction condition and enters the cut-off state. Subsequently, after flowing through the resistor R109, the first voltage regulator module 171, and the first load module 172, the current flows to the fourth switching transistor 152. The fourth switching transistor 152 is turned on, and the current flows from the source of the fourth switching transistor 152 to the drain of the fourth switching transistor 152. Since the drain of the fourth switching transistor 152 is electrically connected to the power output terminal 130, the electrical equipment connected to the power output terminal 130 can enter the operating state based on the external power supply.

[0058] The body diode inside a PMOS transistor is a PN junction formed by a P-type substrate and N-type source / drain electrodes. The body diode is oriented from the source to the drain. When the drain potential is higher than the source potential, the body diode is in a forward bias state, and holes and electrons in the PN junction can move freely, forming a current. Macroscopically, the current in the PMOS transistor flows from the drain to the source at this time.

[0059] That is, in the absence of external power supply, the power supply device based on the internal power supply enters the operating state; while when there is external power supply, while the first switch module 140 directs the current to the power output terminal 130, the power supply from the internal power supply is disconnected by sending a second electrical signal to the second switch module 150, and the current from the external power supply flows to the power output terminal 130 through the fourth switch tube 152; thereby realizing the efficient switching of the power supply device of the present application to the multi-source power supply mode of the electrical equipment, thereby improving the power supply efficiency of the power supply device.

[0060] It should be noted that the switching transistors in the second switching module 150 can also be N-channel field-effect transistors or insulated-gate bipolar transistors. That is, the embodiments of this application do not limit the specific type of each switching transistor in the second switching module 150, and can be set according to the actual situation. When other types of switching transistors are selected, the circuit of the embodiments of this application will be adjusted accordingly, which will not be described in detail here.

[0061] In addition, the dual PMOS transistor design in the fourth switch 152 enables the third switch 151 to prevent excessive positive voltage from damaging subsequent circuits, while the fourth switch 152 can prevent negative voltage or reverse current from damaging the circuit, thereby ensuring the safety and reliability of the circuit in the embodiment of this application.

[0062] According to some embodiments of this application, a signal control terminal 160 is also included, which is electrically connected to the first power input terminal 110 and the input terminal of the first switch module 140, respectively.

[0063] The signal control terminal 160 is used for electrical connection with the control module (not shown in the figure). The control module can be a System on Chip (SoC), Microcontroller Unit (MCU), Programmable Logic Controller (PLC), Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), etc. The specific controller type used can be adapted according to the actual situation, and this embodiment does not limit it. When the control module is a controller, the terminal connected to the signal control terminal 160 is a functional pin of the controller.

[0064] According to some embodiments of this application, when the signal control terminal 160 receives a third electrical signal from the first power input terminal 110, it sends a fourth electrical signal to the input terminal of the first switch module 140, and the first switch module 140 is turned off when it receives the fourth electrical signal.

[0065] like Figure 2 As shown, the circuit also includes a signal control terminal 160, which is electrically connected to the power input terminal. When an external power supply provides power, the controller connected to the signal control terminal 160 can compare the value of the third electrical signal with that of a preset threshold, and then output a fourth electrical signal through the signal control terminal 160, which is electrically connected to the first switch module 140, to control the first switch module 140 to be turned off, thereby determining whether to introduce current from the external power supply.

[0066] Furthermore, the controller includes a comparison and judgment unit, which compares the value of the third electrical signal with that of a preset threshold and obtains the comparison result. That is, when an external power source supplies power to the circuit, if the control module determines that the current power supply exceeds the circuit's capacity, the control module will output a fourth electrical signal through the signal control terminal 160 connected to the second switch 142, thereby blocking power supply from the external power source, and the power supply device will still be powered by the internal power source. The preset threshold used for comparison with the third electrical signal can be set according to actual conditions, and this embodiment does not impose any limitations on this.

[0067] Furthermore, the third electrical signal can be an electrical signal representing a voltage value or an electrical signal representing a current value. For example, if the external power supply voltage is detected to be higher than a set threshold, the signal control terminal 160 sends a fourth electrical signal to the second switch 142. At this time, the second switch 142 is turned off, thereby cutting off the current flow between the external power supply and the subsequent load and preventing high voltage from damaging the circuit.

[0068] In addition, such as Figure 2 As shown, the signal control terminal 160 can also be electrically connected to other load modules. The load module may include resistors R128, R133, and R129, as well as capacitor C62. For example, the load module may include a 39KΩ resistor R128, a 2KΩ resistor R133, and a 1KΩ resistor R129. Resistors R128 and R133 are connected in series, while resistor R129 and capacitor C62 are connected in parallel with resistor R128. The resistors in the load module provide current-limiting protection, while the capacitors filter out high-frequency noise and ripple from the external power supply, thus acting as a filter.

[0069] According to some embodiments of this application, it also includes a first voltage regulator module 171 and a first load module 172. One end of the first voltage regulator module 171 and the first load module 172 are both electrically connected to the output terminal of the first switch module 140, and the other end of the first voltage regulator module 171 and the first load module 172 are respectively electrically connected to the third terminal of the third switch tube 151 and the second terminal of the fourth switch tube 152.

[0070] like Figure 3 As shown, one end of the first voltage regulator module 171 and the first load module 172 are electrically connected to the second end (collector) of the second switch 142, and the other end of the first voltage regulator module 171 and the first load module 172 are electrically connected to the third end (source) of the third switch 151 and the second end (source) of the fourth switch 152, respectively.

[0071] The main function of the first voltage regulator module 171 is to stabilize the output voltage. The first voltage regulator module 171 adjusts the input voltage from the external power supply or the internal power supply and converts it into a constant output voltage. Thus, even if the input voltage fluctuates or the load changes, the output voltage can remain stable, thereby ensuring that the power output terminal 130 receives a stable power supply.

[0072] Furthermore, the first voltage regulator module 171 can be a linear regulator, a switching regulator, etc. The first voltage regulator module 171 can be specifically selected according to the actual situation, and the embodiments of this application do not limit this.

[0073] The first load module 172 is the part of the circuit that actually consumes electrical energy. Together with the first voltage regulator module 171, the first load module 172 stabilizes the current or voltage. The first load module 172 can be a simple resistor or a more complex electronic component or device. For example, the first load module 172 can be a 10KΩ resistor. Of course, depending on the application scenario, the first load module 172 can have various specific forms, and this application embodiment does not limit this. Furthermore, this application embodiment also does not limit the specifications of the first load module 172.

[0074] According to some embodiments of this application, a third switch module 190 is also included. The first and second ends of the third switch module 190 are both electrically connected to the first power input terminal 110, and the third end of the third switch module 190 is grounded.

[0075] According to some embodiments of this application, the first power input terminal 110 is used to send a fifth electrical signal to the third switch module 190. The third switch module 190 is used to turn on when it receives the fifth electrical signal and turn off when it receives a sixth electrical signal, wherein the fifth electrical signal and the sixth electrical signal have opposite polarities.

[0076] like Figure 2 As shown, when the external power supply is not reversed, that is, when the first positive input terminal is connected to the positive terminal of the external power supply and the first negative input terminal is connected to the negative terminal of the external power supply, the signal control terminal 160 receives the fifth electrical signal indicating that the current flow direction is correct, and the third switch module 190 is turned on at this time. When the external power supply is reversed, that is, when the first positive input terminal is connected to the negative terminal of the external power supply and the first negative input terminal is connected to the positive terminal of the external power supply, the signal control terminal 160 receives the sixth electrical signal indicating that the current flow direction is incorrect. At this time, the turn-on condition of the third switch module 190 is not met, the third switch module 190 is turned off, the circuit cannot form a closed loop, so the power supply from the external power supply cannot flow to the power output terminal 130, thereby preventing damage to the circuit caused by the reverse polarity of the power supply.

[0077] According to some embodiments of this application, the third switch module 190 is an N-channel field-effect transistor, the gate and drain of which are electrically connected to the first power input terminal 110, and the source of which is grounded.

[0078] Among them, the N-channel MOSFET (also known as an "NMOS transistor") is a semiconductor device that uses the electric field effect to control current. When the gate of the NMOS transistor receives a high-level signal (i.e., U), G2 When the voltage reaches the second threshold value, the circuit is turned on, allowing current to flow from the drain to the source.

[0079] Furthermore, when the two ends of the external power supply are not reversed, the third switch 151 meets the closing condition and is turned on. The power supply from the external power supply flows through the first switch module 140 and the second switch module 150, and is output from the power output terminal 130. When the two ends of the external power supply are reversed, that is, when the first positive input terminal is connected to the negative terminal of the external power supply and the first negative input terminal is connected to the positive terminal of the external power supply, the third switch 151 does not meet the closing condition and is turned off. The power supply from the external power supply cannot flow into the circuit, thus effectively preventing damage to subsequent circuits caused by reverse power connection.

[0080] Additionally, the third switching module 190 is electrically connected to the second load module, which includes resistors R127 and R135, and a voltage regulator DZ6. For example, the second load module may include a 1KΩ resistor R127, a 10KΩ resistor R135, and a voltage regulator DZ6 with a standard output voltage of 15 volts (V). One end of resistor R127 is electrically connected to the first positive input terminal, and the other end of resistor R127 is electrically connected to one end of both resistor R135 and voltage regulator DZ6. The other ends of resistor R135 and voltage regulator DZ6 are electrically connected to the third terminal (source) of the third switching module 190.

[0081] In addition to the reverse connection prevention function of the third switch module 190, resistors R127 and R135 and voltage regulator DZ6 can provide a stable bias voltage for the third switch module 190, thereby improving the reliability of the entire circuit.

[0082] According to some embodiments of this application, it also includes a voltage suppression module 181 and an energy storage module 182, one end of which is electrically connected to the first power input terminal 110, and the other end of which is grounded.

[0083] The voltage suppression module 181 can be a transient voltage suppressor (TVS), an electronic component used to protect electronic equipment and circuits from transient overvoltages and surge voltages from external power supplies. Specifically, through its special diode structure, a TVS can quickly switch from a high-impedance state to a low-impedance state when the voltage exceeds its operating range, thereby absorbing and dissipating energy in the circuit and protecting other parts from overvoltage effects.

[0084] The energy storage module 182 can be a capacitor. When the first power input terminal 110 receives power from an external power source, the capacitor can filter out ripple and noise in the current, ensuring that the circuit receives a clean and stable external power supply current. In addition, the capacitor can also release the stored charge when voltage fluctuations occur at the power input terminal, smoothing the voltage waveform and ensuring that the components in the circuit receive a stable voltage.

[0085] It should be noted that the voltage suppression module 181 can also be a varistor, a gas discharge tube, a clamping diode, etc. The specific types of components included in the voltage suppression module 181 can be set according to the actual situation. Similarly, the energy storage capacity of the energy storage module 182 can also be set according to the actual situation. This application embodiment does not limit this.

[0086] This application also provides a power supply device, which refers to a device or system that provides power to electronic equipment, mechanical equipment, or other electrical equipment. It is responsible for converting the power supplied by a power source (including external and internal power sources) into voltage and current forms suitable for the use of the electrical equipment, and ensuring the stability and reliability of the power supply.

[0087] Furthermore, the power supply device proposed in this application embodiment, by setting the circuit proposed in this application embodiment, can improve the timeliness of switching the power supply device to different power supplies, thereby improving the power supply efficiency of the power supply device.

[0088] It should also be understood that the various implementation methods provided in this application can be combined arbitrarily to achieve different technical effects.

[0089] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A power supply management circuit with dual power supply switching, characterized in that, include: The system includes a first power input terminal, a second power input terminal, and a power output terminal. The first power input terminal is used to connect to an external power source, and the second power input terminal is used to connect to an internal power source. A first switch module and a second switch module, wherein the input terminal of the first switch module is electrically connected to the first power input terminal, the output terminal of the first switch module is electrically connected to the first terminal and the power output terminal of the second switch module, the second terminal of the second switch module is electrically connected to the second power input terminal, and the third terminal of the second switch module is electrically connected to the power output terminal; Wherein, the first switch module is turned on when it receives a first electrical signal from the first power input terminal, and after being turned on, the first switch module transmits a second electrical signal to the first terminal of the second switch module; the second terminal of the second switch module is turned off when it receives the second electrical signal.

2. The power management circuit with dual power supply switching according to claim 1, characterized in that, The first switch module includes a first switch transistor and a second switch transistor. The first end of the first switch transistor is electrically connected to the first power input terminal, the second end of the first switch transistor is grounded, the third end of the first switch transistor is electrically connected to the first end of the second switch transistor, the second end of the second switch transistor is electrically connected to the first end of the second switch module, and the third end of the second switch transistor is grounded.

3. The power management circuit with dual power supply switching according to claim 1, characterized in that, The second switch module includes a third switch transistor and a fourth switch transistor. The first ends of the third switch transistor and the fourth switch transistor are both electrically connected to the output end of the first switch module. The second end of the third switch transistor is used to connect to the internal power supply. The third end of the third switch transistor is electrically connected to the second end of the fourth switch transistor. The third end of the fourth switch transistor is electrically connected to the power supply output end.

4. The power supply management circuit with dual power supply switching according to claim 1, characterized in that, It also includes a signal control terminal, which is electrically connected to the first power input terminal and the input terminal of the first switch module, respectively.

5. The power management circuit with dual power supply switching according to claim 4, characterized in that, When the signal control terminal receives a third electrical signal from the first power input terminal, it sends a fourth electrical signal to the input terminal of the first switch module, and the first switch module turns off when it receives the fourth electrical signal.

6. The power management circuit with dual power supply switching according to claim 3, characterized in that, It also includes a first voltage regulator module and a first load module. One end of the first voltage regulator module and the first load module are electrically connected to the output terminal of the first switch module, and the other end of the first voltage regulator module and the first load module are electrically connected to the third terminal of the third switch and the second terminal of the fourth switch, respectively.

7. The power supply management circuit with dual power supply switching according to claim 1, characterized in that, It also includes a third switch module, the first and second ends of which are electrically connected to the first power input terminal, and the third end of which is grounded.

8. The power management circuit with dual power supply switching according to claim 7, characterized in that, The first power input terminal is used to send a fifth electrical signal to the third switch module. The third switch module is used to turn on when it receives the fifth electrical signal and turn off when it receives a sixth electrical signal, wherein the fifth electrical signal and the sixth electrical signal have opposite polarities.

9. The power supply management circuit with dual power supply switching according to claim 1, characterized in that, It also includes a voltage suppression module and an energy storage module, one end of which is electrically connected to the first power input terminal, and the other end of which is grounded.

10. A power supply device, characterized in that, It includes the power management circuit with dual power supply switching as described in any one of claims 1 to 9.

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