Charging circuit and intelligent security equipment

Abstract

The utility model relates to a charging circuit and intelligent security and protection equipment. The charging circuit is applied to the intelligent security and protection equipment, and comprises a voltage conversion circuit, the first end of the voltage conversion circuit is used for being coupled with an energy collection unit, and the voltage conversion circuit is used for increasing the output voltage of the energy collection unit; the first end of the energy storage circuit is coupled with the second end of the voltage conversion circuit, and the energy storage circuit is used for storing the electric energy output by the voltage conversion circuit; the first end of the first switch unit is coupled with the first end of the energy storage circuit, and the second end of the first switch unit is used for being coupled with a battery. The energy collected by the energy collection unit is stored through the energy storage circuit, and the stored energy is utilized to charge the battery, so that the situation that the energy collected by the energy collection unit is less and is consumed when not output to the battery is avoided, and the endurance of the intelligent security and protection equipment is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of charging technology, and in particular to a charging circuit and an intelligent security device. Background Art

[0002] After collecting energy from the environment, the energy harvesting unit converts it into electrical energy and outputs it to the battery, thereby extending the battery life of the smart security device. However, if the energy harvesting unit collects less energy, the collected energy is consumed before it is output to the battery, resulting in poor battery life for the smart security device. Utility Model Content

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a charging circuit and an intelligent security device.

[0004] According to a first aspect of the present disclosure, a charging circuit is provided, which is applied to an intelligent security device. The charging circuit includes:

[0005] a voltage conversion circuit, wherein a first end of the voltage conversion circuit is used to couple with the energy collection unit, and the voltage conversion circuit is used to increase the output voltage of the energy collection unit;

[0006] an energy storage circuit, wherein a first terminal of the energy storage circuit is coupled to a second terminal of the voltage conversion circuit, and the energy storage circuit is used to store the electric energy output by the voltage conversion circuit;

[0007] A first switch unit, wherein a first end of the first switch unit is coupled to a first end of the energy storage circuit, and a second end of the first switch unit is used to couple to a battery.

[0008] In some embodiments of the present disclosure, the energy storage circuit includes:

[0009] A capacitor unit, wherein a first end of the capacitor unit is coupled to the second end of the voltage conversion circuit and the first end of the first switch unit, and a second end of the capacitor unit is used to couple to the ground end.

[0010] In some embodiments of the present disclosure, the capacitor unit includes:

[0011] a first supercapacitor, wherein a first terminal of the first supercapacitor is coupled to the second terminal of the voltage conversion circuit and the first terminal of the first switch unit;

[0012] a second supercapacitor, wherein a first end of the second supercapacitor is coupled to the second end of the first supercapacitor, and a second end of the second supercapacitor is used to couple to the ground end.

[0013] In some embodiments of the present disclosure, the energy collection unit includes a solar cell or a radio frequency energy collection device.

[0014] In some embodiments of the present disclosure, the voltage conversion circuit includes a charge pump circuit.

[0015] In some embodiments of the present disclosure, the charging circuit further includes:

[0016] A control circuit, wherein a first end of the control circuit is coupled to a first end of the energy storage circuit, a second end of the control circuit is coupled to a third end of the first switch unit, and the control circuit is used to control the energy storage circuit to charge or stop charging the battery according to the voltage of the energy storage circuit.

[0017] In some embodiments of the present disclosure, the third end of the control circuit is coupled to the first end of the voltage conversion circuit, the fourth end of the control circuit is coupled to the third end of the voltage conversion circuit, and the control circuit is used to detect the input voltage and input current of the voltage conversion circuit.

[0018] In some embodiments of the present disclosure, the fifth terminal of the control circuit is coupled to the fourth terminal of the voltage conversion circuit, and the control circuit is configured to control the voltage conversion circuit according to the input voltage and input current of the voltage conversion circuit.

[0019] In some embodiments of the present disclosure, the control circuit is configured to control the voltage conversion circuit using a maximum power point tracking algorithm.

[0020] In some embodiments of the present disclosure, the charging circuit further includes:

[0021] a second switch unit, the second switch unit being coupled between the voltage conversion circuit and the energy storage circuit; a first terminal of the second switch unit being coupled to the second terminal of the voltage conversion circuit, a second terminal of the second switch unit being coupled to the first terminal of the energy storage circuit, and a third terminal of the second switch unit being coupled to the sixth terminal of the control circuit;

[0022] The control circuit is further configured to control the voltage conversion circuit to output electrical energy to the energy storage circuit or to stop outputting electrical energy.

[0023] In some embodiments of the present disclosure, the charging circuit further includes:

[0024] A boost circuit is coupled between the first switch unit and the battery; a first end of the boost circuit is coupled to the second end of the first switch unit, and a second end of the boost circuit is used to couple to the battery.

[0025] According to a second aspect of the present disclosure, a smart security device is provided, comprising a charging circuit as described in any one of the above items.

[0026] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0027] The charging circuit includes a voltage conversion circuit, an energy storage circuit, and a first switch unit. The voltage conversion circuit is coupled between the energy collection unit and the energy storage circuit, and the first switch unit is coupled between the energy storage circuit and the battery. When the energy collection unit is in a low-energy environment, the output voltage of the energy collection unit may be lower than the voltage of the energy storage circuit. The voltage conversion circuit increases the output voltage of the energy collection unit and stores it in the energy storage circuit. After the electrical energy stored in the energy storage circuit reaches a certain level, the electrical energy stored in the energy storage circuit is output to the battery through the first switch unit to charge the battery. The energy collected by the energy collection unit is stored in the energy storage circuit and the stored energy is used to charge the battery, thereby preventing the energy collected by the energy collection unit from being consumed before being output to the battery, thereby improving the battery life of the intelligent security device. At the same time, because the energy storage circuit intermittently charges the battery, the number of times the first switch unit is turned on and off is reduced, thereby reducing the loss of the first switch unit, thereby further improving the battery life of the intelligent security device.

[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0030] Figure 1 is a structural diagram of a charging circuit provided by an exemplary embodiment of the present disclosure;

[0031] Figure 2 is a structural schematic diagram of a charging circuit provided by another exemplary embodiment of the present disclosure;

[0032] Figure 3 is a structural schematic diagram of a charging circuit provided by another exemplary embodiment of the present disclosure;

[0033] Figure 4 is a structural schematic diagram of a charging circuit provided by another exemplary embodiment of the present disclosure;

[0034] Figure 5 is a structural schematic diagram of a charging circuit provided by another exemplary embodiment of the present disclosure;

[0035] Figure 6 is a graph of input voltage and input power provided by another exemplary embodiment of the present disclosure;

[0036] Figure 7 is a structural schematic diagram of a charging circuit provided by another exemplary embodiment of the present disclosure;

[0037] Figure 8 is a structural schematic diagram of a charging circuit provided by another exemplary embodiment of the present disclosure;

[0038] Figure 9 It is a system block diagram of an intelligent security device provided by an exemplary embodiment of the present disclosure.

[0039] In the picture:

[0040] 10-voltage conversion circuit; 11-charge pump circuit; 20-energy storage circuit; 30-energy collection unit; 31-solar cell; 40-battery; 50-control circuit; 60-boost circuit; 400-intelligent security equipment; 402-processing component; 404-memory; 406-power supply component; 408-multimedia component; 410-audio component; 412-input and output interface; 414-sensor component; 416-communication component; 420-processor; T1-first switch unit; T2-second switch unit; C-capacitor unit; C1-first supercapacitor; C2-second supercapacitor; GND-ground terminal. DETAILED DESCRIPTION

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with certain aspects of the present invention as detailed in the appended claims. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0042] After collecting energy from the environment, the energy harvesting unit can convert the collected energy into electrical energy and output it to the battery to extend the battery life of the smart security device. For example, the energy harvesting unit can collect radio frequency energy or solar energy from the environment and convert it into electrical energy to charge the battery.

[0043] In the related art, a charging circuit is provided, which includes a boost circuit. The boost circuit is coupled between the energy collection unit and the battery of the smart security device. The boost circuit increases the output voltage of the energy collection unit and outputs it to the battery to charge the battery. However, when the energy collection unit is in a low-energy environment, the energy collection unit outputs less electrical energy. The electrical energy output by the energy collection unit is consumed by the boost circuit before it reaches the battery, and the battery cannot be charged, resulting in poor battery life for the smart security device. For example, the loss of the boost circuit is 5 milliwatts. When the energy output by the energy collection unit is less than 5 milliwatts, the energy collection unit cannot charge the battery through the boost circuit.

[0044] Based on this, the present disclosure provides a charging circuit for use in intelligent security devices. When an energy harvesting unit is in a low-energy environment, the energy storage circuit can store the energy collected by the energy harvesting unit to a certain level and then charge the battery through a first switch unit. This reduces the likelihood that the energy output by the energy harvesting unit will be consumed before reaching the battery, thereby improving the battery life of the intelligent security device. Furthermore, because the energy storage circuit intermittently charges the battery, the number of times the first switch unit is turned on and off is reduced, thereby reducing losses in the first switch unit, further improving the battery life of the intelligent security device.

[0045] An exemplary embodiment of the present disclosure provides a charging circuit, which is applied to intelligent security equipment, such as Figure 1 As shown, the charging circuit includes a voltage conversion circuit 10, an energy storage circuit 20, and a first switch unit T1. The first terminal of the voltage conversion circuit 10 is coupled to the energy harvesting unit 30, and the voltage conversion circuit 10 is used to increase the output voltage of the energy harvesting unit 30. The first terminal of the energy storage circuit 20 is coupled to the second terminal of the voltage conversion circuit 10, and the energy storage circuit 20 is used to store the electrical energy output by the voltage conversion circuit 10. The first terminal of the first switch unit T1 is coupled to the first terminal of the energy storage circuit 20, and the second terminal of the first switch unit T1 is coupled to the battery 40.

[0046] In this embodiment, the charging circuit includes a voltage conversion circuit, an energy storage circuit, and a first switch unit. The voltage conversion circuit is coupled between the energy collection unit and the energy storage circuit, and the first switch unit is coupled between the energy storage circuit and the battery. When the energy collection unit is in a low-energy environment, the output voltage of the energy collection unit may be lower than the voltage of the energy storage circuit. The output voltage of the energy collection unit is increased by the voltage conversion circuit and stored in the energy storage circuit. After the electrical energy stored in the energy storage circuit reaches a certain level, the electrical energy stored in the energy storage circuit is output to the battery through the first switch unit to charge the battery. The energy collected by the energy collection unit is stored in the energy storage circuit and the stored energy is used to charge the battery, thereby avoiding the energy collected by the energy collection unit from being consumed before being output to the battery, thereby improving the battery life of the intelligent security device. At the same time, because the energy storage circuit intermittently charges the battery, the number of times the first switch unit is turned on and off is reduced, thereby reducing the loss of the first switch unit, thereby further improving the battery life of the intelligent security device.

[0047] In one embodiment, if Figure 2 As shown, the energy storage circuit 20 includes a capacitor unit C. A first end of the capacitor unit C is coupled to the second end of the voltage conversion circuit 10 and the first end of the first switch unit T1 , and a second end of the capacitor unit C is coupled to the ground GND.

[0048] In this embodiment, since the capacitor unit has a simple structure and has the function of storing electrical energy, the capacitor unit and the first switch unit are coupled to enable the capacitor unit to store the energy collected by the energy collection unit and output it to the battery to charge the battery, thereby reducing the complexity of the charging circuit structure.

[0049] In one embodiment, if Figure 3 As shown, the capacitor unit C includes a first supercapacitor C1 and a second supercapacitor C2. The first end of the first supercapacitor C1 is coupled to the second end of the voltage conversion circuit 10 and the first end of the first switch unit T1. The first end of the second supercapacitor C2 is coupled to the second end of the first supercapacitor C1, and the second end of the second supercapacitor C2 is coupled to the ground terminal GND.

[0050] In this embodiment, because one supercapacitor stores relatively little energy, the energy stored in the supercapacitor quickly reaches its upper limit. The first switch unit needs to be frequently switched on and off to release the energy stored in the supercapacitor, resulting in high losses in the charging circuit. By storing energy in both the first and second supercapacitors, the upper limit of the energy storage circuit is increased, thereby reducing the number of times the first switch unit is switched on and off, thereby reducing losses in the charging circuit. Furthermore, because the conduction losses of the first switch unit are proportional to the battery charging time, the first and second supercapacitors release energy quickly, further reducing losses in the charging circuit.

[0051] Exemplarily, the second end of the first switch unit T1 is used to couple to the positive electrode of the battery 40 , and the second end of the second supercapacitor C2 is used to couple to both the ground terminal GND and the negative electrode of the battery 40 .

[0052] For example, the voltages of the first supercapacitor C1 and the second supercapacitor C2 may be the same, for example, both may be 2.5V, 2.7V, etc. The voltages of the first supercapacitor C1 and the second supercapacitor C2 may also be different, for example, the voltage of the first supercapacitor C1 is 2.7V, and the voltage of the second supercapacitor is 2.5V.

[0053] Exemplarily, the capacitor unit C may further include a third supercapacitor, a fourth supercapacitor, and the like.

[0054] In one embodiment, the energy harvesting unit 30 includes a solar cell.

[0055] In this embodiment, since solar cells can convert solar energy into electrical energy, they are in a low-energy environment when insufficient sunlight is present, resulting in a relatively low output voltage. By using solar cells as energy harvesting units, the charging circuit can store the electrical energy output by the solar cells to charge the battery, thereby improving the reliability of the charging circuit.

[0056] In one embodiment, the energy harvesting unit 30 includes a radio frequency energy harvesting device.

[0057] In this embodiment, the RF energy harvesting device can collect electromagnetic waves in the environment and convert them into electrical energy. When electromagnetic waves are low, the RF energy harvesting device is in a low-energy environment, resulting in a relatively low output voltage. By using the RF energy harvesting device as the energy harvesting unit, the charging circuit can store the electrical energy output by the RF energy harvesting device to charge the battery, thereby improving the reliability of the charging circuit.

[0058] In one embodiment, if Figure 4 As shown, the voltage conversion circuit 10 includes a charge pump circuit 11 .

[0059] In this embodiment, due to the high conversion efficiency of the charge pump circuit, the output voltage of the energy harvesting unit is increased by the charge pump circuit, which reduces the loss of the charging circuit and improves the battery life of the intelligent security device.

[0060] Exemplarily, the charge pump circuit 11 may be a boost charge pump circuit.

[0061] In one embodiment, if Figure 5As shown, the charging circuit further includes a control circuit 50. A first terminal of the control circuit 50 is coupled to a first terminal of the energy storage circuit 20, and a second terminal of the control circuit 50 is coupled to a third terminal of the first switch unit T1. The control circuit 50 is configured to control the energy storage circuit 20 to charge or stop charging the battery 40 according to the voltage of the energy storage circuit 20.

[0062] In this embodiment, as the energy storage circuit gradually increases as it stores energy, and the stored energy is positively correlated with the voltage of the energy storage circuit, the control circuit can detect the voltage of the energy storage circuit. When the energy stored in the energy storage circuit reaches a certain amount, the control circuit can control the first switch unit to conduct, allowing the energy storage circuit to charge the battery. When the energy stored in the energy storage circuit is low, the control circuit can control the first switch unit to disconnect, stopping the energy storage circuit from charging the battery. By controlling the first switch unit based on the voltage of the energy storage circuit, the control circuit can prevent the energy storage circuit from being unable to output energy to the battery due to insufficient stored energy, thereby improving the reliability of the charging circuit.

[0063] For example, a first voltage threshold may be set in the control circuit 50. When the voltage of the energy storage circuit 20 detected by the control circuit 50 is greater than the first voltage threshold, the control circuit 50 controls the first switch unit T1 to be turned on so that the energy storage circuit 20 charges the battery 40. When the voltage of the energy storage circuit 20 detected by the control circuit 50 is less than or equal to the first voltage threshold, the control circuit 50 controls the first switch unit T1 to be turned off so that the energy storage circuit 20 stops charging the battery 40. The first voltage threshold may be determined based on the voltage at which the stored electrical energy of the energy storage circuit 20 reaches an upper limit.

[0064] In one embodiment, the third end of the control circuit 50 is coupled to the first end of the voltage conversion circuit 10, and the fourth end of the control circuit 50 is coupled to the third end of the voltage conversion circuit 10. The control circuit 50 is used to detect the input voltage and input current of the voltage conversion circuit 10.

[0065] In this embodiment, the electrical energy output by the energy harvesting unit can be determined by detecting the input voltage and input current of the voltage conversion circuit, and the charging circuit can be controlled based on the electrical energy output by the energy harvesting unit. Controlling the charging circuit by determining the electrical energy output by the energy harvesting unit avoids additional losses in the event that the electrical energy output by the energy harvesting unit cannot be stored, thereby improving the reliability of the charging circuit.

[0066] Exemplarily, the charging circuit may include a first resistor and a second resistor. The first resistor is coupled between the third terminal of the control circuit 50 and the energy harvesting unit 30, and the second resistor is coupled between the third terminal of the control circuit 50 and the ground terminal GND. The control circuit 50 may detect the input voltage of the voltage conversion circuit 10 by detecting the voltage between the first resistor and the second resistor. The charging circuit may further include a third resistor coupled between the third terminal of the voltage conversion circuit 10 and the ground terminal GND. The control circuit 50 may detect the input current of the voltage conversion circuit 10 by detecting the voltage across the third resistor.

[0067] In one embodiment, the fifth terminal of the control circuit 50 is coupled to the fourth terminal of the voltage conversion circuit 10 , and the control circuit 50 is configured to control the voltage conversion circuit 10 according to the input voltage and input current of the voltage conversion circuit 10 .

[0068] In this embodiment, the output voltage and output power of the energy harvesting unit have different corresponding relationships under different energy environments. By detecting the input voltage and input current of the voltage conversion circuit, the input power of the voltage conversion circuit can be determined. The control circuit can adjust the input voltage of the voltage conversion circuit based on the input power of the voltage conversion circuit to maintain the input power of the voltage conversion circuit at a relatively high level. By maximizing the input power of the voltage conversion circuit, the energy harvesting unit outputs a high amount of electrical energy to the energy storage circuit, thereby improving the charging efficiency of the battery.

[0069] Exemplarily, the control circuit 50 may adjust the input voltage of the voltage conversion circuit 10 by controlling the load inside the voltage conversion circuit 10 .

[0070] For example, Figure 6 As shown, under the same energy environment, when the input voltage of the voltage conversion circuit 10 is U1, the input power of the voltage conversion circuit 10 is P1. When the input voltage of the voltage conversion circuit 10 is U2, the input power of the voltage conversion circuit 10 is P2. When the input voltage of the voltage conversion circuit 10 is U3, the input power of the voltage conversion circuit 10 is P3. When the input voltage of the voltage conversion circuit 10 is U4, the input power of the voltage conversion circuit 10 is P4. The load of the voltage conversion circuit 10 is adjusted by the control circuit 50, so that the input voltage of the voltage conversion circuit 10 changes, and thus the input power of the voltage conversion circuit 10 changes. For example, when the input voltage of the voltage conversion circuit 10 is U1, the load of the voltage conversion circuit 10 is adjusted by the control circuit 50, so that the input voltage of the voltage conversion circuit 10 changes to U3. At this time, the input power of the voltage conversion circuit 10 is adjusted from P1 to P3, thereby increasing the input power of the voltage conversion circuit 10.

[0071] In one embodiment, the control circuit 50 is configured to control the voltage conversion circuit 10 using a Maximum Power Point Tracking (MPPT) algorithm.

[0072] In this embodiment, the maximum power point tracking algorithm can maintain the input power of the voltage conversion circuit near the maximum power point when the environment in which the energy harvesting unit is located changes, thereby improving the charging efficiency of the battery.

[0073] For example, before controlling the voltage conversion circuit 10 using the maximum power point tracking algorithm, it is necessary to determine the relationship between the input power and input voltage of the voltage conversion circuit 10 under the current energy environment. To reduce losses in the charging circuit, the input power and input voltage of the voltage conversion circuit 10 can be tested under multiple different loads of the voltage conversion circuit 10, and the load of the voltage conversion circuit 10 can be controlled to the load corresponding to the maximum input power during these multiple testing processes.

[0074] In one embodiment, if Figure 7 As shown, the charging circuit further includes a second switch unit T2. The second switch unit T2 is coupled between the voltage conversion circuit 10 and the energy storage circuit 20. A first terminal of the second switch unit T2 is coupled to the second terminal of the voltage conversion circuit 10, a second terminal of the second switch unit T2 is coupled to the first terminal of the energy storage circuit 20, and a third terminal of the second switch unit T2 is coupled to the sixth terminal of the control circuit 50. The control circuit 50 is further configured to control the voltage conversion circuit 10 to output or stop outputting electrical energy to the energy storage circuit 20.

[0075] In this embodiment, since the voltage of the energy storage circuit continues to increase during energy storage, the energy storage circuit is susceptible to damage when the voltage of the energy storage circuit exceeds the maximum voltage the energy storage circuit can withstand. The second control unit can be used to control the second switch unit to conduct when the voltage of the energy storage circuit is significantly lower than the maximum voltage the energy storage circuit can withstand, allowing the energy storage circuit to store energy. The control circuit can also control the second switch unit to disconnect when the voltage of the energy storage circuit approaches the maximum voltage the energy storage circuit can withstand, causing the energy storage circuit to stop storing energy. Controlling whether the energy storage circuit stores energy through the second switch unit reduces the possibility of damage to the energy storage circuit, thereby improving the reliability of the charging circuit.

[0076] For example, the control circuit 50 may set a second voltage threshold. When the voltage of the energy storage circuit 20 detected by the control circuit 50 is greater than the second voltage threshold, the control circuit 50 controls the second switch unit T2 to be turned off so that the voltage conversion circuit 10 stops charging the energy storage circuit 20. When the control circuit 50 detects that the voltage of the energy storage circuit 20 is less than or equal to the second voltage threshold, the control circuit 50 controls the second switch unit T2 to be turned on so that the voltage conversion circuit 10 charges the energy storage circuit 20. The second voltage threshold may be the same as or different from the first voltage threshold.

[0077] In one embodiment, the charging circuit further includes a boost circuit 60. The boost circuit 60 is coupled between the first switch unit T1 and the battery 40. A first terminal of the boost circuit 60 is coupled to a second terminal of the first switch unit T1, and a second terminal of the boost circuit 60 is coupled to the battery 40.

[0078] In this embodiment, as the energy storage circuit releases energy to the battery, its voltage gradually decreases. To maximize energy release and reduce the number of on-off cycles between the first and second switch units, the boost circuit in the intelligent security device is reused to increase the voltage of the energy storage circuit. By reusing the boost voltage to increase the voltage of the energy storage circuit, the number of on-off cycles between the first and second switch units is reduced, thereby extending the battery life of the intelligent security device.

[0079] For example, when the voltage of the energy storage circuit 20 is less than or equal to the third voltage threshold, the energy storage circuit 20 stops charging the battery 40. The third voltage threshold may be the minimum voltage that the second boost circuit 60 can convert.

[0080] Exemplarily, the third voltage threshold is smaller than the first voltage threshold and the second voltage threshold.

[0081] Exemplarily, the boost circuit 60 may be a Boost circuit.

[0082] For example, the first switch unit T1 may be a transistor. When the first switch unit T1 is a P-type field effect transistor, the source of the first switch unit T1 is coupled to the first end of the energy storage circuit 20, the drain of the first switch unit T1 is coupled to the first end of the boost circuit 60, and the gate of the first switch unit T1 is coupled to the second end of the control circuit 50.

[0083] For example, the second switch unit T2 may be a transistor. When the second switch unit T2 is a P-type field effect transistor, the source of the second switch unit T2 is coupled to the second terminal of the voltage conversion circuit 10 , the drain of the second switch unit T2 is coupled to the first terminal of the energy storage circuit 20 , and the gate of the second switch unit T2 is coupled to the sixth terminal of the control circuit 50 .

[0084] An exemplary embodiment of the present disclosure further provides a charging circuit, such as Figure 8 As shown, the charging circuit includes a charge pump circuit 11, a control circuit 50, a boost circuit 60, a first supercapacitor C1, a second supercapacitor C2, a first switch unit T1, and a second switch unit T2. A first terminal of the charge pump circuit 11 is coupled to the solar cell 31, a second terminal of the charge pump circuit 11 is coupled to the source of the second switch unit T2, a third terminal of the charge pump circuit 11 is coupled to the fourth terminal of the control circuit 50, and the fourth terminal of the charge pump circuit 11 is coupled to the fifth terminal of the control circuit 50. The drain of the second switch unit T2 is coupled to the first terminal of the first supercapacitor C1, the first terminal of the control circuit 50, and the source of the first switch unit T1. The gate of the second switch unit T2 is coupled to the sixth terminal of the control circuit 50. The second terminal of the first supercapacitor C1 is coupled to the first terminal of the second supercapacitor C2. The second terminal of the second supercapacitor C2 is coupled to the ground terminal GND and the negative electrode of the battery 40. The drain of the first switch unit T1 is coupled to the first terminal of the boost circuit 60, and the gate of the first switch unit T1 is coupled to the second terminal of the control circuit 50. The second terminal of the boost circuit 60 is coupled to the positive terminal of the battery 40. The third terminal of the control circuit 50 is coupled to the first terminal of the charge pump circuit 11.

[0085] For example, when the energy harvesting unit is in a low-light environment, the solar cell 31 outputs less electrical energy. The control circuit 50 detects the input voltage and input current of the charge pump circuit 11 to determine the input power of the charge pump circuit 11. The control circuit 50 adjusts the input voltage of the charge pump circuit 11 according to the current input power of the charge pump circuit 11 until the input power of the charge pump circuit 11 approaches the maximum input power. When the control circuit 50 detects that the sum of the voltages of the first supercapacitor C1 and the second supercapacitor C2 is less than or equal to a second voltage threshold, the control circuit 50 controls the second switch unit T2 to conduct and the first switch unit T1 to disconnect, so that the charge pump circuit 11 increases the output voltage of the solar cell 31 and stores electrical energy in the first supercapacitor C1 and the second supercapacitor C2. When the control circuit 50 detects that the voltages of the first supercapacitor C1 and the second supercapacitor C2 are greater than the second voltage threshold, the control circuit 50 controls the second switch unit T2 to disconnect and the first switch unit T1 to conduct, and the first supercapacitor C1 and the second supercapacitor C2 charge the battery 40 through the boost circuit 60. When the first terminal of the control circuit 50 detects that the voltages of the first supercapacitor C1 and the second supercapacitor C2 are less than or equal to the third voltage threshold of the boost circuit 60, the control circuit 50 controls the first switch unit T1 to be disconnected and controls the second switch unit T2 to be turned on, completing one charge.

[0086] In an exemplary embodiment, a smart security device is provided, such as a low-power device such as a smart door lock, a peephole, or a doorbell. The smart security device includes the charging circuit described above.

[0087] refer to Figure 9 As shown, the smart security device 400 may include one or more of the following components: a processing component 402 , a memory 404 , a power component 406 , a multimedia component 408 , an audio component 410 , an input / output (I / O) interface 412 , a sensor component 414 , and a communication component 416 .

[0088] Processing component 402 generally controls the overall operation of smart security device 400, such as operations associated with display, phone calls, data communications, camera operation, and recording operations. Processing component 402 may include one or more processors 420 to execute instructions to perform all or part of the steps of the aforementioned method. Furthermore, processing component 402 may include one or more modules to facilitate interaction between processing component 402 and other components. For example, processing component 402 may include a multimedia module to facilitate interaction between multimedia component 408 and processing component 402.

[0089] The memory 404 is configured to store various types of data to support the operation of the smart security device 400. Examples of such data include instructions for any application or method operating on the smart security device 400, contact data, phone book data, messages, pictures, videos, etc. The memory 404 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0090] The power supply component 406 provides power to the various components of the smart security device 400. The power supply component 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the smart security device 400.

[0091] The multimedia component 408 includes a screen that provides an output interface between the smart security device 400 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, slides, and gestures on the touch panel. The touch sensor can not only sense the boundaries of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 408 includes a front camera module and / or a rear camera module. When the smart security device 400 is in an operating mode, such as a shooting mode or a video mode, the front camera module and / or the rear camera module can receive external multimedia data. Each front camera module and the rear camera module can be a fixed optical lens system or have focal length and optical zoom capabilities.

[0092] The audio component 410 is configured to output and / or input audio signals. For example, the audio component 410 includes a microphone (MIC) that is configured to receive external audio signals when the smart security device 400 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 404 or transmitted via the communication component 416. In some embodiments, the audio component 410 also includes a speaker for outputting audio signals.

[0093] I / O interface 412 provides an interface between processing component 402 and peripheral interface modules, such as a keyboard, click wheel, buttons, etc. These buttons may include but are not limited to: a home button, volume buttons, a start button, and a lock button.

[0094] The sensor assembly 414 includes one or more sensors for providing various status assessments of the smart security device 400. For example, the sensor assembly 414 can detect the open / closed state of the smart security device 400, the relative positioning of components, such as the display and keypad of the smart security device 400. The sensor assembly 414 can also detect changes in the position of the smart security device 400 or a component of the smart security device 400, the presence or absence of user contact with the smart security device 400, the orientation or acceleration / deceleration of the smart security device 400, and changes in the temperature of the smart security device 400. The sensor assembly 414 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 414 can also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 can also include an accelerometer, a gyroscope, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0095] The communication component 416 is configured to facilitate wired or wireless communication between the smart security device 400 and other terminals. The smart security device 400 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 416 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 416 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0096] In an exemplary embodiment, the smart security device 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing terminals (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0099] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0100] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A charging circuit, applied to intelligent security equipment, characterized in that: The charging circuit includes: a voltage conversion circuit, wherein a first end of the voltage conversion circuit is used to couple with the energy collection unit, and the voltage conversion circuit is used to increase the output voltage of the energy collection unit; an energy storage circuit, wherein a first terminal of the energy storage circuit is coupled to a second terminal of the voltage conversion circuit, and the energy storage circuit is used to store the electric energy output by the voltage conversion circuit; A first switch unit, wherein a first end of the first switch unit is coupled to a first end of the energy storage circuit, and a second end of the first switch unit is used to couple to a battery.

2. The charging circuit according to claim 1, wherein: The energy storage circuit comprises: A capacitor unit, wherein a first end of the capacitor unit is coupled to the second end of the voltage conversion circuit and the first end of the first switch unit, and a second end of the capacitor unit is used to couple to the ground end.

3. The charging circuit according to claim 2, wherein: The capacitor unit includes: a first supercapacitor, wherein a first terminal of the first supercapacitor is coupled to the second terminal of the voltage conversion circuit and the first terminal of the first switch unit; a second supercapacitor, wherein a first end of the second supercapacitor is coupled to the second end of the first supercapacitor, and a second end of the second supercapacitor is used to couple to the ground end.

4. The charging circuit according to claim 1, wherein: The energy collection unit includes a solar cell or a radio frequency energy collection device.

5. The charging circuit according to claim 1, wherein: The voltage conversion circuit includes a charge pump circuit.

6. The charging circuit according to claim 1, wherein: The charging circuit further includes: A control circuit, wherein a first end of the control circuit is coupled to a first end of the energy storage circuit, a second end of the control circuit is coupled to a third end of the first switch unit, and the control circuit is used to control the energy storage circuit to charge or stop charging the battery according to the voltage of the energy storage circuit.

7. The charging circuit according to claim 6, wherein: The third end of the control circuit is coupled to the first end of the voltage conversion circuit, the fourth end of the control circuit is coupled to the third end of the voltage conversion circuit, and the control circuit is used to detect the input voltage and input current of the voltage conversion circuit.

8. The charging circuit according to claim 7, characterized in that: The fifth terminal of the control circuit is coupled to the fourth terminal of the voltage conversion circuit, and the control circuit is configured to control the voltage conversion circuit according to an input voltage and an input current of the voltage conversion circuit.

9. The charging circuit according to claim 8, characterized in that: The control circuit is configured to control the voltage conversion circuit using a maximum power point tracking algorithm.

10. The charging circuit according to claim 7, wherein: The charging circuit further includes: a second switch unit, the second switch unit being coupled between the voltage conversion circuit and the energy storage circuit; a first terminal of the second switch unit being coupled to the second terminal of the voltage conversion circuit, a second terminal of the second switch unit being coupled to the first terminal of the energy storage circuit, and a third terminal of the second switch unit being coupled to the sixth terminal of the control circuit; The control circuit is further configured to control the voltage conversion circuit to output electrical energy to the energy storage circuit or to stop outputting electrical energy.

11. The charging circuit according to any one of claims 1 to 10, characterized in that: The charging circuit further includes: A boost circuit is coupled between the first switch unit and the battery; a first end of the boost circuit is coupled to the second end of the first switch unit, and a second end of the boost circuit is used to couple to the battery.

12. An intelligent security device, characterized in that: The intelligent security device comprises the charging circuit according to any one of claims 1 to 11.

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