Power supply system for smart door and smart door

Abstract

This specification discloses a power supply system and a smart door for a smart door. The power supply system includes: a power supply circuit; a first energy storage element; a second energy storage element; a first charging circuit electrically connected to the power supply circuit and the first energy storage element and configured to charge the first energy storage element; a second charging circuit electrically connected to the first energy storage element and configured to charge the first energy storage element in a constant current manner; a power management circuit electrically connected to the power supply circuit, the first energy storage element and the second energy storage element and configured to selectively provide outputs of the power supply circuit, the first energy storage element and the second energy storage element. The power supply system and the smart door provide lithium batteries and supercapacitors as emergency power sources outside the main power supply circuit, and provide two-way charging solutions to ensure the charging of the supercapacitor, so that the supercapacitor can be charged even when the main power supply circuit and the lithium battery fail.

Description

Technical Field

[0001] The present application relates to the field of smart homes, and in particular to a power supply system for smart doors and a smart door. Background Art

[0002] At present, the smart monitoring equipment and smart locks on some smart doors require uninterrupted power supply to ensure that the smart doors can work properly.

[0003] Therefore, an improved power supply system is needed to provide multiple backup power sources and corresponding charging circuits. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, one or more embodiments of the present specification provide lithium batteries and supercapacitors as emergency power sources outside the main power supply circuit, and provide a two-way charging scheme to ensure the charging of the supercapacitor, so that the smart door can work normally even when both the main power supply circuit and the lithium battery fail.

[0005] In order to solve the above technical problems, one aspect of the present specification provides a power supply system for a smart door, which includes: a power supply circuit; a first energy storage element; a second energy storage element; a first charging circuit, electrically connected to the power supply circuit and the first energy storage element and configured to charge the first energy storage element; a second charging circuit, electrically connected to the first energy storage element and configured to charge the first energy storage element in a constant current manner; a power management circuit, electrically connected to the power supply circuit, the first energy storage element and the second energy storage element and configured to selectively provide outputs of the power supply circuit, the first energy storage element and the second energy storage element.

[0006] In one or more embodiments, the power supply circuit includes a power adapter configured to be electrically connected to an AC power source and convert an AC voltage from the AC power source into a DC voltage.

[0007] In one or more embodiments, the first energy storage element includes a supercapacitor or a plurality of supercapacitors connected in series.

[0008] In one or more embodiments, the first charging circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a first diode, wherein the first end of the first resistor is electrically connected to the anode of the first diode, the second end of the first resistor is electrically connected to the first end of the second resistor, the second end of the second resistor is electrically connected to the power supply circuit, the first end of the third resistor is electrically connected to the anode of the first diode, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is electrically connected to the power supply circuit, and the cathode of the first diode is electrically connected to the charging end of the first energy storage element.

[0009] In one or more embodiments, the second charging circuit includes: a boost circuit configured to be electrically connected to a DC power supply to boost a first DC voltage from the DC power supply to form a second DC voltage; and a constant current circuit electrically connected to the boost circuit and the first energy storage element and configured to generate a power output having a constant current based on the second DC voltage.

[0010] In one or more embodiments, the boost circuit includes a DC boost chip, a first inductor, a first capacitor, a fifth resistor, a sixth resistor, a seventh resistor, and a second diode, wherein the first end of the first inductor is used to be electrically connected to the DC power supply, the second end of the first inductor is connected to the inductance connection end of the DC boost chip, the first end of the seventh resistor is used to be electrically connected to the DC power supply, the second end of the seventh resistor is grounded, the first end of the first capacitor is used to be electrically connected to the DC power supply, the second end of the first capacitor is grounded, the first end of the fifth resistor is electrically connected to the cathode of the second diode, the second end of the fifth resistor is electrically connected to the feedback end of the DC boost chip, the first end of the sixth resistor is electrically connected to the second end of the fifth resistor, the second end of the sixth resistor is grounded, the anode of the second diode is electrically connected to the second end of the first inductor, the enable end and the voltage input end of the DC boost chip are both electrically connected to the first end of the first capacitor, and the ground end of the DC boost chip is grounded.

[0011] In one or more embodiments, the constant current circuit includes a switching buck type lithium battery charging chip, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a second inductor, an eighth resistor, a ninth resistor, a third diode, and a fourth diode, wherein the first end of the second capacitor is electrically connected to the lithium ion state chip select input terminal of the switching buck type lithium battery charging chip, the second end of the second capacitor is grounded, the first end of the third capacitor is electrically connected to the cathode of the second diode, the second end of the third capacitor is grounded, the first end of the fourth capacitor is electrically connected to the cathode of the second diode, the second end of the fourth capacitor is grounded, the first end of the fifth capacitor is electrically connected to the cathode of the second diode, the second end of the fifth capacitor is grounded, the first end of the sixth capacitor is electrically connected to the output current detection positive input terminal of the switching buck type lithium battery charging chip, the second end of the sixth capacitor is grounded, the first end of the seventh capacitor is electrically connected to the output current detection positive input terminal of the switching buck type lithium battery charging chip, the second end of the seventh capacitor is grounded, the first end of the eighth capacitor is electrically connected to the battery voltage detection terminal of the switching buck type lithium battery charging chip, and the second end of the eighth capacitor is grounded. , the first end of the ninth capacitor is electrically connected to the battery voltage detection terminal of the switching buck type lithium battery charging chip, the second end of the ninth capacitor is grounded, the first end of the second inductor is electrically connected to the current output terminal of the switching buck type lithium battery charging chip, the second end of the second inductor is electrically connected to the output current detection positive input terminal of the switching buck type lithium battery charging chip, the first end of the eighth resistor is electrically connected to the second end of the second inductor, the second end of the eighth resistor is electrically connected to the battery voltage detection terminal of the switching buck type lithium battery charging chip, the first end of the ninth resistor is electrically connected to the The trickle pre-charge current setting terminal, the second end of the ninth resistor is grounded, the anode of the third diode is grounded, the cathode of the third diode is electrically connected to the first end of the second inductor, the anode of the fourth diode is electrically connected to the second end of the eighth resistor, the cathode of the fourth diode is electrically connected to the charging end of the first energy storage element, the lithium ion state chip select input terminal of the switching buck type lithium battery charging chip is short-circuited with the internal power supply terminal, the input voltage positive input terminal of the switching buck type lithium battery charging chip is electrically connected to the cathode of the second diode, and the battery temperature detection input terminal, the power ground terminal and the middle pad of the switching buck type lithium battery charging chip are all grounded.

[0012] In one or more embodiments, the power management circuit includes a fifth diode, a sixth diode, a seventh diode and an eighth diode, wherein the cathodes of the fifth diode, the sixth diode, the seventh diode and the eighth diode are electrically connected together, the anode of the fifth diode is electrically connected to the discharge end of the first energy storage element, the anode of the sixth diode is electrically connected to the second energy storage element, the anode of the seventh diode is electrically connected to the power supply circuit, and the anode of the eighth diode is grounded.

[0013] Another aspect of the present specification provides a door, which includes: a door frame for fixing to a wall; a door body connected to the door frame by a hinge so as to be pivotable relative to the door frame between an open position and a closed position; the aforementioned power supply system, disposed in the door body; a lock, disposed on the door body, the lock including a lock tongue and a motor for driving the lock tongue, the motor being electrically connected to the power supply system; a control circuit, disposed in the door body and electrically connected to the power supply system and the motor, the control circuit being used to send a control signal to the motor to control the operation of the motor; a plug, disposed on the door body and electrically connected to the power supply system; and a socket, disposed on the side of the door frame facing the door body, wherein the plug and the socket are configured such that when the door body is in the closed position, the plug is plugged into the socket, and when the door body is in the open position, the plug is separated from the socket.

[0014] In one or more embodiments, the plug includes a connecting pin, and the socket includes a jack for receiving the connecting pin. Both the connecting pin and the jack are arc-shaped, and the center of the arc is located on the rotation axis of the hinge.

[0015] According to the power supply system for smart doors of one or more embodiments of this specification, lithium batteries and supercapacitors are provided as backup power sources in addition to the main power supply circuit, and the supercapacitors are charged through two charging schemes. Specifically, the first charging scheme uses multiple resistors to limit current charging and uses diodes to prevent current backflow. The other charging scheme charges the supercapacitor through a boost circuit and a constant current circuit, which not only reduces the damage to the supercapacitor, but also enables the use of a power bank to provide emergency power to the supercapacitor in situations such as power outages. The above technical solutions provide multiple guarantees for the power supply of smart doors and solve the problem of emergency power supply for smart doors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following figures describe in detail exemplary embodiments disclosed in this specification. Identical reference numerals denote similar structures in several views of the drawings. Those skilled in the art will appreciate that these embodiments are non-limiting, exemplary embodiments, and that the drawings are for illustration and description purposes only and are not intended to limit the scope of this specification. Other embodiments may also accomplish the same conceptual intent of this specification. It should be understood that the drawings are not drawn to scale. Among them:

[0017] Figure 1 is a schematic structural diagram of a smart door according to one or more embodiments of the present specification, wherein the smart door is in a closed state;

[0018] Figure 2 is a schematic structural diagram of a smart door according to one or more embodiments of the present specification, wherein the smart door is in an open state;

[0019] Figure 3 According to one or more embodiments of this specification Figure 1 Schematic diagram of the smart door taken along line AA';

[0020] Figure 4 According to one or more embodiments of this specification Figure 2 Schematic diagram of the smart door intercepted by line BB';

[0021] Figure 5 is a schematic diagram of a power supply system for a smart door according to one or more embodiments of this specification;

[0022] Figure 6 A circuit diagram of a power supply system for a smart door according to one or more embodiments of the present specification. DETAILED DESCRIPTION

[0023] The following description provides specific application scenarios and requirements for this specification, with the goal of enabling those skilled in the art to make and use the contents of this specification. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but is intended to be accorded the broadest scope consistent with the claims.

[0024] In this specification, the term "exterior" refers to the exterior of the enclosed space formed by a door mounted on a wall when closed, and the term "interior" refers to the interior of the enclosed space formed by a door mounted on a wall when closed. Exterior can also be referred to as the outdoors or outside the door, and interior can also be referred to as the interior of the house or inside the door.

[0025] Figure 1This is a schematic structural diagram of a smart door according to one or more embodiments of the present specification, wherein the smart door is in a closed state. Figure 2 This is a schematic structural diagram of a smart door according to one or more embodiments of the present specification, wherein the smart door is in an open state.

[0026] like Figure 1 and Figure 2 As shown, the smart door 200 may include a door frame 210 , a door body 220 , a power supply system 100 , a socket 250 , a plug 260 , a lock 280 and a control circuit 300 .

[0027] The door frame 210 can be secured to a wall. The door frame 210 may include four sides: a first side, a second side, a third side, and a fourth side. The first side may be opposite the second side, and the third side may be opposite the fourth side. The first side faces the outside, the second side faces the inside, the third side faces the door body 220 (when the door body 220 is closed), and the fourth side faces the wall or is embedded in the wall.

[0028] The door body 220 is hinged to the door frame 210 by a hinge 221 and can be in an open position ( Figure 2 shown position) and closed position ( Figure 1 positions shown).

[0029] The socket 250 may be fixed to the door frame 210. For example, the socket 250 may be provided on the third side of the door frame 210. The socket 250 may be electrically connected to a distribution box 600 on the wall. The distribution box 600 may provide commercial power (eg, 220V) to the socket 250.

[0030] The plug 260 may be fixed to the door 220 and electrically connected to the power supply system 100 disposed in the door 220 , so as to supply power to the power supply system 100 by combining with the socket 250 .

[0031] Figure 3 According to one or more embodiments of this specification Figure 1 Schematic diagram of the smart door taken along line AA'. Figure 4 According to one or more embodiments of this specification Figure 2 Schematic diagram of the smart door taken along line BB'.

[0032] like Figure 3 and Figure 4As shown, plug 260 may include connecting pins. Socket 250 may include a receptacle for receiving the connecting pins. Both the connecting pins and the receptacle are arc-shaped, with the center of the arc located on the rotation axis of hinge 221. The receptacle of receptacle 250 may be located on the side of door frame 210 facing door body 220 (when door body 220 is in the closed position).

[0033] Plug 260 can be oriented opposite receptacle 250 (facing the side of door 220) such that when door 220 is in the closed position, the connecting pins of plug 260 are inserted into the receptacles of receptacle 250, and when door 220 is in the open position, the connecting pins of plug 260 are disengaged from the receptacles of receptacle 250. In some embodiments, the positions of plug 260 and receptacle 250 can be interchanged, i.e., plug 260 can be disposed on door frame 210, and receptacle 250 can be disposed on door 220. In some embodiments, plug 260 can be replaced with a power transmitting device, and receptacle 250 can be replaced with a power receiving device. The power transmitting device and the power receiving device can be configured such that when door 220 is in the closed position, the power transmitting device is in close contact with the power receiving device for wireless charging, and when door 220 is in the open position, the power transmitting device is separated from the power receiving device.

[0034] A lock 280 may be provided on the door 220. The lock 280 may include a lock tongue 281 and a motor (not shown) for driving the lock tongue 281. The motor may be electrically connected to the power supply system 100 and the control circuit 300. The motor may be configured to drive the lock tongue 281 into a receptacle on the door frame 210 when the lock tongue 281 is aligned with the receptacle, thereby securing the door 220 in the closed position.

[0035] The control circuit 300 is disposed within the door body 220 and is electrically connected to the power supply system 100 and the motor. The control circuit 300 is configured to send control signals to the motor to control its operation (e.g., the rotation of its output shaft). The control circuit 300 may include a single-chip microcomputer, a central processing unit (CPU), a microprocessor (MPU), a microcontroller (MCU), a field-programmable gate array (FPGA), a programmable logic controller (PLC), an application-specific integrated circuit (ASIC), or other circuit structures or electronic devices capable of controlling the motor. The control circuit 300 may be powered by the power supply system 100.

[0036] Figure 5 Schematic diagram of a power supply system for a smart door according to one or more embodiments of the present specification. Figure 6 A circuit diagram of a power supply system for a smart door according to one or more embodiments of the present specification.

[0037] like Figure 5 and Figure 6 As shown, the power supply system 100 may include a power supply circuit 10 , a first energy storage element 20 , a second energy storage element 30 , a first charging circuit 40 , a second charging circuit 50 and a power management circuit 60 .

[0038] The power supply circuit 10 may include a power adapter configured to be electrically connected to an AC power source (eg, a distribution box 600 or a plug 260 ) and convert an AC voltage (eg, 220 V) from the AC power source into a DC voltage (eg, 5 V).

[0039] The first energy storage element 20 can be electrically connected to the first charging circuit 40, the second charging circuit 50, and the power management circuit 60. The first energy storage element 20 may include a supercapacitor or multiple supercapacitors connected in series. A supercapacitor is a new type of energy storage device between traditional capacitors and rechargeable batteries. It combines the rapid charging and discharging characteristics of a capacitor with the energy storage characteristics of a battery. Supercapacitors are new components that store energy through the interfacial double layer formed between electrodes and electrolytes. When the electrodes come into contact with the electrolyte, due to the Coulomb force, intermolecular forces, and interatomic forces, a stable double layer of charges with opposite signs appears at the solid-liquid interface, called the interfacial double layer. A double-layer supercapacitor can be thought of as two inactive porous plates suspended in an electrolyte, with voltage applied to the two plates. The potential applied to the positive plate attracts negative ions in the electrolyte, while the negative plate attracts positive ions, thereby forming a double-layer capacitor on the surfaces of the two electrodes. Double-layer capacitors can be categorized as carbon electrode double-layer supercapacitors, metal oxide electrode supercapacitors, and organic polymer electrode supercapacitors, depending on the electrode material.

[0040] The second energy storage element 30 may be a lithium battery, a nickel-cadmium battery or a nickel-metal hydride battery.

[0041] The first charging circuit 40 can be electrically connected to the power supply circuit 10 and the first energy storage element 20 and configured to charge the first energy storage element 20 based on the power provided by the power supply circuit 10. The first charging circuit 40 can include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first diode D1. The first end of the first resistor R1 can be electrically connected to the anode of the first diode D1, the second end of the first resistor R1 can be electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 can be electrically connected to the power supply circuit 10. The first end of the third resistor R3 can be electrically connected to the anode of the first diode D1, the second end of the third resistor R3 can be electrically connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 can be electrically connected to the power supply circuit 10. The cathode of the first diode D1 can be electrically connected to the charging terminal of the first energy storage element 20. The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 can be used for current limiting charging, and the first diode D1 can be used to prevent current backflow. In some embodiments, the first resistor R1 , the second resistor R2 , the third resistor R3 , and the fourth resistor R4 may each be a resistor of approximately 50 ohms (eg, rated at 2 watts). In some embodiments, the first diode D1 may be a SD103AW series Schottky diode.

[0042] The second charging circuit 50 may be electrically connected to the first energy storage element 20 and configured to charge the first energy storage element 20 in a constant current manner. The second charging circuit 50 may include a boost circuit 51 and a constant current circuit 52.

[0043] The boost circuit 51 may be configured to be electrically connected to a DC power source 70 (eg, a power bank) to boost a first DC voltage (eg, approximately 5V) from the DC power source 70 to form a second DC voltage (eg, approximately 8.8V).

[0044] The boost circuit 51 may include a DC boost chip X1 , a first inductor L1 , a first capacitor C1 , a fifth resistor R5 , a sixth resistor R6 , a seventh resistor R7 , and a second diode D2 . A first end of the first inductor L1 is electrically connectable to the DC power source 70 , a second end of the first inductor L1 is connected to the inductor connection terminal LX (e.g., the voltage output terminal) of the DC boost chip X1 , a first end of the first capacitor C1 is electrically connectable to the DC power source 70 , a second end of the first capacitor C1 can be grounded, a first end of the seventh resistor R7 is electrically connectable to the DC power source 70 , a second end of the seventh resistor R7 can be grounded, a first end of the fifth resistor R5 can be electrically connected to the cathode of the second diode D2 , a second end of the fifth resistor R5 can be electrically connected to the feedback terminal FB of the DC boost chip X1 , a first end of the sixth resistor R6 can be electrically connected to the second end of the fifth resistor R5 , a second end of the sixth resistor R6 can be grounded, an anode of the second diode D2 can be electrically connected to the second end of the first inductor L1 , an enable terminal EN and a voltage input terminal IN of the DC boost chip X1 can both be electrically connected to the first end of the first capacitor C1 , and a groundable terminal GND of the DC boost chip X1 can be grounded.

[0045] In some embodiments, the DC boost chip X1 can be, for example, a SY7208 series, XR3403 series, ZCC3710 series, or MT3608 series DC boost chip. In this embodiment, a SY7208 series DC boost chip is used. In some embodiments, the first inductor L1 is approximately 4.7 μH, the second capacitor C2 is approximately 10 μF, the fifth resistor R5 is approximately 1 MΩ, the sixth resistor R6 is approximately 75 KΩ, and the seventh resistor R7 is approximately 180 Ω. In some embodiments, the second diode D2 is an SS210 series Schottky diode.

[0046] The constant current circuit 52 may be electrically connected to the boost circuit 51 and the first energy storage element 20 and configured to generate a power output having a constant current based on the second DC voltage.

[0047] The constant current circuit 52 includes a switching buck type lithium battery charging chip X2, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a second inductor L2, an eighth resistor R8, a ninth resistor R9, a third diode D3, and a fourth diode D4. A first end of the second capacitor C2 can be electrically connected to the lithium ion state chip select input terminal CS of the switching buck type lithium battery charging chip X2, a second end of the second capacitor C2 can be grounded, a first end of the third capacitor C3 can be electrically connected to the cathode of the second diode D2, a second end of the third capacitor C3 can be grounded, a first end of the fourth capacitor C4 can be electrically connected to the cathode of the second diode D2, a second end of the fourth capacitor C4 can be grounded, a first end of the fifth capacitor C5 can be electrically connected to the cathode of the second diode D2, a second end of the fifth capacitor C5 can be grounded, and a first end of the sixth capacitor C6 can be electrically connected to the cathode of the switching buck type lithium battery charging chip X2. The output current detection positive input terminal VS, the second end of the sixth capacitor C6 can be grounded, the first end of the seventh capacitor C7 can be electrically connected to the output current detection positive input terminal VS of the switching buck type lithium battery charging chip X2, the second end of the seventh capacitor C7 can be grounded, the first end of the eighth capacitor C10 can be electrically connected to the battery voltage detection terminal BAT of the switching buck type lithium battery charging chip X2, the second end of the eighth capacitor C8 can be grounded, the first end of the ninth capacitor C9 can be electrically connected to the battery voltage detection terminal BAT of the switching buck type lithium battery charging chip X2, the second end of the ninth capacitor can be grounded, and the first end of the second inductor L2 can be electrically connected To the current output terminal LX (for example, 2) of the switching buck type lithium battery charging chip X2, the second end of the second inductor L2 can be electrically connected to the output current detection positive input terminal VS of the switching buck type lithium battery charging chip X2, the first end of the eighth resistor R8 can be electrically connected to the second end of the second inductor L2, the second end of the eighth resistor R8 can be electrically connected to the battery voltage detection terminal BAT of the switching buck type lithium battery charging chip X2, the first end of the ninth resistor R9 can be electrically connected to the trickle pre-charge current setting terminal of the switching buck type lithium battery charging chip X2, the second end of the ninth resistor R9 can be grounded, the anode of the third diode D3 can be grounded, and the The cathode of the third diode D3 can be electrically connected to the first end of the second inductor L2, the anode of the fourth diode D4 can be electrically connected to the second end of the eighth resistor R8, the cathode of the fourth diode D4 can be electrically connected to the charging end of the first energy storage element 20, the lithium ion status chip select input terminal CS of the switching buck type lithium battery charging chip X2 is short-circuited with the internal power supply terminal VREG, the input voltage positive input terminal VIN (for example, 4) of the switching buck type lithium battery charging chip X2 can be electrically connected to the cathode of the second diode D2, and the battery temperature detection input terminal TS, the power ground terminal GND and the middle pad PAD of the switching buck type lithium battery charging chip X2 can all be grounded.

[0048] In some embodiments, the switching buck-type lithium battery charger chip X2 can be, for example, a TP5100 series switching buck-type lithium battery charger chip. The TP5100 series switching buck-type lithium battery charger chip is a dual-cell 8.4V / single-cell 4.2V lithium battery charging management chip with built-in input overcurrent protection, undervoltage protection, chip overtemperature protection, short-circuit protection, battery temperature monitoring, and reverse battery protection. The TP5100 series switching buck-type lithium battery charger chip has a wide input voltage range of 5V-18V and charges the battery in three stages: trickle pre-charge, constant current, and constant voltage. The trickle pre-charge current and constant current charging current are both adjusted via external resistors, with a maximum charging current of 2A. The TP5100 series switching buck-type lithium battery charger chip uses a 400kHz switching frequency operation mode, allowing it to use smaller peripheral components and maintain low heat generation during high-current charging. The TP5100 series switching buck-type lithium battery charger chip has a built-in power PMOSFET and anti-backflow circuit, eliminating the need for external protection such as anti-backflow Schottky diodes.

[0049] In some embodiments, the third capacitor C3 has a size of approximately 10 μF, the fourth capacitor C4 has a size of approximately 10 μF, the fifth capacitor C5 has a size of approximately 10 μF, the sixth capacitor C6 has a size of approximately 0.1 μF, the seventh capacitor C7 has a size of approximately 10 μF, the eighth capacitor C8 has a size of approximately 10 μF, the ninth capacitor C9 has a size of approximately 10 μF, the tenth capacitor C10 has a size of approximately 10 μF, the second inductor L2 has a size of approximately 4.7 μH, the seventh resistor R7 has a size of approximately 0 Ω, and the eighth resistor R8 has a size of approximately 0.18 Ω. In some embodiments, the third diode D3 is a SS210 series Schottky diode, and the fourth diode D4 is an IN4007 series rectifier diode.

[0050] The power management circuit 60 may be electrically connected to the power supply circuit 10 , the first energy storage element 20 and the second energy storage element 30 and configured to selectively provide outputs of the power supply circuit 10 , the first energy storage element 20 and the second energy storage element 30 .

[0051] The power management circuit 60 may include a fifth diode D5, a sixth diode D6, a seventh diode D7, and an eighth diode D8. The cathodes of the fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8 may be electrically connected together, the anode of the fifth diode D5 may be electrically connected to the discharge terminal of the first energy storage element 20, the anode of the sixth diode D6 may be electrically connected to the second energy storage element 30, the anode of the seventh diode D7 may be electrically connected to the power supply circuit 10, and the anode of the eighth diode D8 may be grounded.

[0052] In some embodiments, the fifth diode D5 is an ES5DC series Schottky diode, the sixth diode D6 is an SB1045L series Schottky diode, the seventh diode D7 is an ES5DC series Schottky diode, and the eighth diode D8 is an SMAJ15CA series transient suppression diode.

[0053] In summary, after reading this detailed disclosure, it will be understood by those skilled in the art that the foregoing detailed disclosure may be presented by way of example only and may not be restrictive. Although not explicitly stated herein, it will be understood by those skilled in the art that this specification is intended to encompass various reasonable changes, improvements, and modifications to the embodiments. Such changes, improvements, and modifications are intended to be set forth in this specification and are within the spirit and scope of the exemplary embodiments of this specification.

Claims

1. A power supply system for a smart door, characterized in that: include: a power supply circuit, the power supply circuit comprising a power adapter configured to be electrically connected to an AC power source and convert an AC voltage from the AC power source into a DC voltage; a first energy storage element; a second energy storage element; a first charging circuit, electrically connected to the power supply circuit and the first energy storage element and configured to charge the first energy storage element; The second charging circuit is electrically connected to the first energy storage element and is configured to charge the first energy storage element in a constant current manner. The second charging circuit includes: a boost circuit, configured to be electrically connected to a DC power supply to boost a first DC voltage from the DC power supply to form a second DC voltage. The boost circuit includes a DC boost chip, a first inductor, a first capacitor, a fifth resistor, a sixth resistor, a seventh resistor, and a second diode. The first end of the first inductor is used to be electrically connected to the DC power supply, the second end of the first inductor is connected to the inductor connection end of the DC boost chip, and the first end of the seventh resistor is used to be electrically connected to the a DC power supply, the second end of the seventh resistor is grounded, the first end of the first capacitor is used to be electrically connected to the DC power supply, the second end of the first capacitor is grounded, the first end of the fifth resistor is electrically connected to the cathode of the second diode, the second end of the fifth resistor is electrically connected to the feedback terminal of the DC boost chip, the first end of the sixth resistor is electrically connected to the second end of the fifth resistor, the second end of the sixth resistor is grounded, the anode of the second diode is electrically connected to the second end of the first inductor, the enable terminal and the voltage input terminal of the DC boost chip are both electrically connected to the first end of the first capacitor, and the ground terminal of the DC boost chip is grounded; and a constant current circuit electrically connected to the boost circuit and the first energy storage element and configured to generate a power output with a constant current based on the second DC voltage, the constant current circuit comprising a switching buck type lithium battery charging chip, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a second inductor, an eighth resistor, a ninth resistor, a third diode and a fourth diode, wherein the first end of the second capacitor is electrically connected to the lithium ion state chip select input terminal of the switching buck type lithium battery charging chip, the second end of the second capacitor is grounded, and the first end of the third capacitor is electrically connected to the cathode of the second diode The first end of the seventh capacitor is electrically connected to the output current detection positive input terminal of the switching buck type lithium battery charging chip, the second end of the seventh capacitor is grounded, and the first end of the eighth capacitor is electrically connected to the output current detection positive input terminal of the switching buck type lithium battery charging chip. The second end of the seventh capacitor is grounded, and the first end of the eighth capacitor is electrically connected to the output current detection positive input terminal of the switching buck type lithium battery charging chip. The battery voltage detection terminal of the eighth capacitor is connected to the ground, the first end of the ninth capacitor is electrically connected to the battery voltage detection terminal of the switching buck type lithium battery charging chip, the second end of the ninth capacitor is grounded, the first end of the second inductor is electrically connected to the current output terminal of the switching buck type lithium battery charging chip, the second end of the second inductor is electrically connected to the output current detection positive input terminal of the switching buck type lithium battery charging chip, the first end of the eighth resistor is electrically connected to the second end of the second inductor, the second end of the eighth resistor is electrically connected to the battery voltage detection terminal of the switching buck type lithium battery charging chip, the first end of the ninth resistor is electrically connected to the switch The trickle pre-charge current setting terminal of the step-down lithium battery charging chip, the second end of the ninth resistor is grounded, the anode of the third diode is grounded, the cathode of the third diode is electrically connected to the first end of the second inductor, the anode of the fourth diode is electrically connected to the second end of the eighth resistor, the cathode of the fourth diode is electrically connected to the charging end of the first energy storage element, the lithium ion state chip select input terminal of the switching step-down lithium battery charging chip is short-circuited with the internal power supply terminal, the input voltage positive input terminal of the switching step-down lithium battery charging chip is electrically connected to the cathode of the second diode, and the battery temperature detection input terminal, the power ground terminal and the middle pad of the switching step-down lithium battery charging chip are all grounded; The power management circuit is electrically connected to the power supply circuit, the first energy storage element, and the second energy storage element and is configured to selectively provide outputs of the power supply circuit, the first energy storage element, and the second energy storage element.

2. The power supply system for a smart door according to claim 1, characterized in that: The first energy storage element includes a supercapacitor or a plurality of supercapacitors connected in series.

3. The power supply system for smart door according to claim 1, characterized in that: The first charging circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a first diode, wherein the first end of the first resistor is electrically connected to the anode of the first diode, the second end of the first resistor is electrically connected to the first end of the second resistor, the second end of the second resistor is electrically connected to the power supply circuit, the first end of the third resistor is electrically connected to the anode of the first diode, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is electrically connected to the power supply circuit, and the cathode of the first diode is electrically connected to the charging end of the first energy storage element.

4. The power supply system for a smart door according to claim 1, characterized in that: The power management circuit includes a fifth diode, a sixth diode, a seventh diode and an eighth diode, wherein the cathodes of the fifth diode, the sixth diode, the seventh diode and the eighth diode are electrically connected together, the anode of the fifth diode is electrically connected to the discharge end of the first energy storage element, the anode of the sixth diode is electrically connected to the second energy storage element, the anode of the seventh diode is electrically connected to the power supply circuit, and the anode of the eighth diode is grounded.

5. A smart door, characterized in that: include: Door frame, for fixing to the wall; a door body connected to the door frame by a hinge so as to be pivotable relative to the door frame between an open position and a closed position; The power supply system for a smart door according to any one of claims 1 to 4, arranged in the door body; a lock, disposed on the door body, comprising a lock tongue and a motor for driving the lock tongue, wherein the motor is electrically connected to the power supply system; a control circuit, disposed in the door body and electrically connected to the power supply system and the motor, the control circuit being configured to send a control signal to the motor to control the operation of the motor; a plug, disposed on the door body and electrically connected to the power supply system; as well as The socket is arranged on the side of the door frame facing the door body. The plug and the socket are configured such that when the door is in the closed position, the plug is plugged into the socket, and when the door is in the open position, the plug is separated from the socket.

6. The smart door according to claim 5, characterized in that: The plug includes a connecting pin, and the socket includes a socket for receiving the connecting pin. Both the connecting pin and the socket are arc-shaped, and the center of the arc is located on the rotation axis of the hinge.

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